JP2011084458A - Cement composition - Google Patents
Cement composition Download PDFInfo
- Publication number
- JP2011084458A JP2011084458A JP2010112925A JP2010112925A JP2011084458A JP 2011084458 A JP2011084458 A JP 2011084458A JP 2010112925 A JP2010112925 A JP 2010112925A JP 2010112925 A JP2010112925 A JP 2010112925A JP 2011084458 A JP2011084458 A JP 2011084458A
- Authority
- JP
- Japan
- Prior art keywords
- cement composition
- cement
- parts
- diameter
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004568 cement Substances 0.000 title claims abstract description 96
- 239000000203 mixture Substances 0.000 title claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 26
- 239000004760 aramid Substances 0.000 claims abstract description 14
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 13
- 239000000057 synthetic resin Substances 0.000 claims abstract description 13
- 229920006231 aramid fiber Polymers 0.000 claims description 38
- 239000012615 aggregate Substances 0.000 claims description 2
- 210000004556 brain Anatomy 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 23
- 229920003235 aromatic polyamide Polymers 0.000 abstract 2
- 238000005452 bending Methods 0.000 description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 22
- 238000001723 curing Methods 0.000 description 20
- 239000011398 Portland cement Substances 0.000 description 18
- 239000002245 particle Substances 0.000 description 16
- 238000000227 grinding Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 229910021487 silica fume Inorganic materials 0.000 description 11
- 239000003822 epoxy resin Substances 0.000 description 10
- 230000035515 penetration Effects 0.000 description 10
- 229920000647 polyepoxide Polymers 0.000 description 10
- 239000010453 quartz Substances 0.000 description 10
- 230000007423 decrease Effects 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000005299 abrasion Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 229920002978 Vinylon Polymers 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- -1 and the like Substances 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、アラミド繊維を使用したセメント組成物に関する。 The present invention relates to a cement composition using aramid fibers.
従来より、有機繊維を含有する機械的特性（圧縮強度、曲げ強度、破壊エネルギー、静弾性係数等）に優れるセメント系材料（モルタル、コンクリート等）が種々提案されている。
例えば、セメントと、ＢＥＴ比表面積5〜25m2/gの微粉末と、ブレーン比表面積3000〜30000cm2/gの無機粉末と、細骨材と、有機繊維と、減水剤及び水を含むセメント組成物が提案されている（特許文献１）。該セメント組成物では、その実施例において、直径0.3mm、長さ13mmのビニロン繊維や直径0.3mm、長さ13mmのアラミド繊維が使用されている。そして、150〜170N/mm2程度の圧縮強度と20〜30N/mm2程度の曲げ強度が得られている。
また、セメント、ポゾラン質微粉末、細骨材、減水剤、補強用繊維、収縮低減剤、空気量調整剤および水からなる高強度モルタルが提案されている（特許文献２）。該高強度モルタルでは、その実施例において、直径0.012mm、長さ12mm又は30mmのアラミド繊維が使用されている。そして、170N/mm2程度の圧縮強度と25N/mm2程度の曲げ強度が得られている。
Conventionally, various cement-based materials (mortar, concrete, etc.) excellent in mechanical properties (compressive strength, bending strength, fracture energy, static elastic modulus, etc.) containing organic fibers have been proposed.
For example, a cement, a fine powder having a BET specific surface area 5~25m 2 / g, and inorganic powders of Blaine specific surface area 3000~30000cm 2 / g, and fine aggregate, and organic fibers, cement composition comprising a water reducing agent and water The thing is proposed (patent document 1). In this embodiment, vinylon fibers having a diameter of 0.3 mm and a length of 13 mm and aramid fibers having a diameter of 0.3 mm and a length of 13 mm are used. Then, 150~170N / mm 2 approximately compressive strength and 20-30 N / mm 2 of about bending strength is obtained.
Further, a high-strength mortar composed of cement, pozzolanic fine powder, fine aggregate, water reducing agent, reinforcing fiber, shrinkage reducing agent, air amount adjusting agent and water has been proposed (Patent Document 2). In the high strength mortar, an aramid fiber having a diameter of 0.012 mm and a length of 12 mm or 30 mm is used in the embodiment. Then, 170N / mm 2 approximately compressive strength and 25 N / mm 2 of about bending strength is obtained.
一般に、機械的特性に優れるセメント組成物（具体的には、モルタル、コンクリート等）は、次のような利点を有する。
(1)現場打ちで建築物等を構築する場合には、コンクリート層の厚さを薄くすることができるので、コンクリートの打設量が少なくなり、労力の軽減、コストの削減、利用空間の増大等を図ることができる。
(2)プレキャスト部材を製造する場合には、該プレキャスト部材の厚さを薄くすることができるので、軽量化を図ることができ、運搬や施工が容易になる。
(3)耐摩耗性や、中性化・クリープ等に対する耐久性が向上する。
現在、これらの利点に鑑みて、有機繊維を含有するセメント組成物においても、より機械的特性に優れるセメント組成物、特に高い圧縮強度（具体的には180N/mm2以上の圧縮強度）を発現できるセメント組成物が望まれている。
しかしながら、前記特許文献１、２に開示されるセメント組成物や高強度モルタルでは、有機繊維を含有する場合、圧縮強度が180N/mm2以上のセメント質硬化体を製造することは困難である。
In general, a cement composition (specifically, mortar, concrete, etc.) having excellent mechanical properties has the following advantages.
(1) When building buildings on site, the thickness of the concrete layer can be reduced, reducing the amount of concrete placement, reducing labor, reducing costs, and increasing use space. Etc. can be achieved.
(2) When a precast member is manufactured, the thickness of the precast member can be reduced, so that the weight can be reduced, and transportation and construction are facilitated.
(3) Abrasion resistance and durability against neutralization and creep are improved.
At present, in view of these advantages, cement compositions containing organic fibers also exhibit higher mechanical properties, especially high compressive strength (specifically, compressive strength of 180 N / mm 2 or more). Cement compositions that can be made are desired.
However, in the cement compositions and high-strength mortars disclosed in Patent Documents 1 and 2, it is difficult to produce a cementitious hardened body having a compressive strength of 180 N / mm 2 or more when it contains organic fibers.
本発明は、上述の背景に鑑みてなされたものであって、有機繊維を含有するセメント組成物においても、180N/mm2以上の圧縮強度を発現し、他の機械的特性にも優れるセメント組成物を提供することを目的とする。 The present invention has been made in view of the above background, and in a cement composition containing an organic fiber, a cement composition that expresses a compressive strength of 180 N / mm 2 or more and is excellent in other mechanical properties. The purpose is to provide goods.
本発明者は、上記課題を解決するために鋭意検討した結果、セメント、ＢＥＴ比表面積が3〜25m2/gの微粉末とともに、特定の直径のモノフィラメントタイプのアラミド繊維を集束した補強用繊維を使用することにより、本発明の上記目的を達成することができることを見い出し、本発明を完成するに至った。
すなわち、本発明は、セメント、ＢＥＴ比表面積が3〜25m2/gの微粉末、細骨材、補強用繊維、減水剤及び水を含むセメント組成物であって、
前記補強用繊維が、直径0.012〜0.1mmのモノフィラメントタイプのアラミド繊維を合成樹脂で集束した、直径0.15〜0.55mmで長さ1〜30mmの集束型のアラミド繊維であることを特徴とするセメント組成物を提供するものである。
As a result of diligent studies to solve the above problems, the present inventor has found a reinforcing fiber in which monofilament-type aramid fibers having a specific diameter are bundled together with cement, fine powder having a BET specific surface area of 3 to 25 m 2 / g. It has been found that the above object of the present invention can be achieved by using it, and the present invention has been completed.
That is, the present invention is a cement composition comprising cement, fine powder having a BET specific surface area of 3 to 25 m 2 / g, fine aggregate, reinforcing fiber, water reducing agent, and water,
Cement composition characterized in that the reinforcing fiber is a converged aramid fiber having a diameter of 0.15 to 0.55 mm and a length of 1 to 30 mm obtained by converging monofilament type aramid fibers having a diameter of 0.012 to 0.1 mm with a synthetic resin. It provides things.
本発明のセメント組成物では、機械的特性（圧縮強度、曲げ強度、破壊エネルギー、静弾性係数等）や耐久性に優れるセメント質硬化体を製造することができる。特に、本発明のセメント組成物では、有機繊維を含有するセメント組成物では従来困難であった180N/mm2以上の圧縮強度を発現するセメント質硬化体を製造することができる。そのため、本発明のセメント組成物は、有機繊維を含有するセメント組成物では従来適用することが困難であった橋梁部材等の構造部材用途にも適用することが可能になる。 With the cement composition of the present invention, it is possible to produce a cementitious hardened body excellent in mechanical properties (compressive strength, bending strength, fracture energy, static elastic modulus, etc.) and durability. In particular, with the cement composition of the present invention, it is possible to produce a hardened cementitious material that exhibits a compressive strength of 180 N / mm 2 or more, which was conventionally difficult with a cement composition containing organic fibers. Therefore, the cement composition of the present invention can be applied to structural member applications such as bridge members, which have been difficult to apply conventionally with cement compositions containing organic fibers.
以下、本発明について詳細に説明する。
本発明のセメント組成物は、セメント、ＢＥＴ比表面積が3〜25m2/gの微粉末、細骨材、直径0.15〜0.55mmで長さ1〜30mmの集束型のアラミド繊維、減水剤及び水を必須成分として含むものである。
セメントの種類としては、特に限定されないが、例えば、普通ポルトランドセメント、早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメント等の各種ポルトランドセメントを使用することができる。
本発明において、セメント組成物からなる硬化体の早期強度を向上させようとする場合には、早強ポルトランドセメントを使用することが好ましく、セメント組成物の流動性を向上させようとする場合には、中庸熱ポルトランドセメントや低熱ポルトランドセメントを使用することが好ましい。
Hereinafter, the present invention will be described in detail.
The cement composition of the present invention includes cement, fine powder having a BET specific surface area of 3 to 25 m 2 / g, fine aggregate, a converged aramid fiber having a diameter of 0.15 to 0.55 mm and a length of 1 to 30 mm, a water reducing agent and water. As an essential component.
Although it does not specifically limit as a kind of cement, For example, various Portland cements, such as normal Portland cement, early-strong Portland cement, moderately hot Portland cement, low heat Portland cement, can be used.
In the present invention, when trying to improve the early strength of the cured body made of a cement composition, it is preferable to use early-strength Portland cement, and when trying to improve the fluidity of the cement composition. It is preferable to use medium heat Portland cement or low heat Portland cement.
ＢＥＴ比表面積が3〜25m2/gの微粉末としては、シリカフューム、シリカダスト、フライアッシュ、スラグ、火山灰、シリカゾル、沈降シリカ、石灰石粉末等が挙げられる。一般に、シリカフュームやシリカダストは、そのＢＥＴ比表面積が5〜25m2/gであり、粉砕等をする必要がないので、本発明の微粉末として好適である。また、被粉砕性や流動性等の観点から、石灰石粉末も本発明の微粉末として好適である。
上記微粉末のＢＥＴ比表面積は、3〜25m2/g、好ましくは7〜15m2/gである。該値が3m2/g未満では、180N/mm2以上の圧縮強度を得ることが困難であり、また緻密性や耐久性等も低下する。一方、該値が25m2/gを越えるものは、入手が困難であるうえ、単位水量が増大し、硬化後の強度、緻密性や耐久性等が低下することがある。
上記微粉末の配合量は、セメント100質量部に対して、好ましくは5〜50質量部、より好ましくは10〜40質量部である。配合量が5質量部未満では、180N/mm2以上の圧縮強度を得ることが困難であり、また緻密性や耐衝撃性等も低下する。一方、配合量が50質量部を越えると、単位水量が増大し、硬化後の強度、緻密性や耐衝撃性等が低下することがある。
Examples of the fine powder having a BET specific surface area of 3 to 25 m 2 / g include silica fume, silica dust, fly ash, slag, volcanic ash, silica sol, precipitated silica, and limestone powder. In general, silica fume and silica dust have a BET specific surface area of 5 to 25 m 2 / g and do not need to be pulverized, and thus are suitable as the fine powder of the present invention. Moreover, limestone powder is also suitable as the fine powder of the present invention from the viewpoints of pulverizability and fluidity.
The fine powder has a BET specific surface area of 3 to 25 m 2 / g, preferably 7 to 15 m 2 / g. When the value is less than 3 m 2 / g, it is difficult to obtain a compressive strength of 180 N / mm 2 or more, and the denseness and durability are also lowered. On the other hand, when the value exceeds 25 m 2 / g, it is difficult to obtain, the unit water amount increases, and the strength, denseness, durability and the like after curing may decrease.
The blending amount of the fine powder is preferably 5 to 50 parts by mass, more preferably 10 to 40 parts by mass with respect to 100 parts by mass of cement. If the blending amount is less than 5 parts by mass, it is difficult to obtain a compressive strength of 180 N / mm 2 or more, and the denseness and impact resistance are also lowered. On the other hand, when the blending amount exceeds 50 parts by mass, the unit water amount increases, and the strength, denseness, impact resistance and the like after curing may decrease.
細骨材としては、川砂、陸砂、海砂、砕砂、珪砂等又はこれらの混合物が挙げられる。 本発明においては、細骨材としては、配合物の流動性や硬化体の強度、緻密性や耐久性等から、最大粒径が2.0mm以下、より好ましくは1.5mm以下のものを用いることが好ましい。また、流動性や作業性等から、細骨材中の0.15mm未満の粒子の割合が5.0質量％以下であることが好ましい。
細骨材の配合量は、配合物の流動性や施工性、硬化体の強度、耐久性の観点、さらには、自己収縮や乾燥収縮の低減、水和発熱量の低減等の観点から、セメント100質量部に対して、好ましくは50〜250質量部、より好ましくは80〜180質量部である。
Examples of the fine aggregate include river sand, land sand, sea sand, crushed sand, silica sand, and the like, or a mixture thereof. In the present invention, as the fine aggregate, the maximum particle size is 2.0 mm or less, more preferably 1.5 mm or less, from the fluidity of the composition, the strength of the cured body, the compactness, the durability, and the like. preferable. From the viewpoint of fluidity and workability, the proportion of particles having a size of less than 0.15 mm in the fine aggregate is preferably 5.0% by mass or less.
The amount of fine aggregate blended is determined from the viewpoint of fluidity and workability of the blend, strength of the cured body, durability, as well as reduction of self-shrinkage and drying shrinkage, reduction of hydration calorific value, etc. Preferably it is 50-250 mass parts with respect to 100 mass parts, More preferably, it is 80-180 mass parts.
水としては、水道水等を使用することができる。
本発明において、水／セメント比は、配合物の流動性や施工性、硬化体の強度、緻密性や耐久性等から、10〜30質量％が好ましく、15〜25質量％がより好ましい。
As water, tap water or the like can be used.
In the present invention, the water / cement ratio is preferably from 10 to 30% by mass, more preferably from 15 to 25% by mass, from the viewpoint of fluidity and workability of the blend, strength of the cured product, denseness and durability.
減水剤としては、リグニン系、ナフタレンスルホン酸系、メラミン系、ポリカルボン酸系の減水剤、ＡＥ減水剤、高性能減水剤または高性能ＡＥ減水剤を使用することができる。なかでも、ポリカルボン酸系の高性能減水剤または高性能ＡＥ減水剤を使用することが好ましい。減水剤を配合することによって、配合物の流動性や施工性、硬化体の緻密性、強度や耐久性等が向上する。
減水剤の配合量は、配合物の流動性や分離抵抗性、硬化体の緻密性、強度や耐久性、コスト等の面から、セメント100質量部に対して固形分換算で0.1〜4.0質量部が好ましく、0.1〜2.0質量部がより好ましく、0.1〜1.0質量部が特に好ましい。
As the water reducing agent, a lignin-based, naphthalenesulfonic acid-based, melamine-based, or polycarboxylic acid-based water reducing agent, an AE water reducing agent, a high-performance water reducing agent, or a high-performance AE water reducing agent can be used. Among these, it is preferable to use a polycarboxylic acid-based high-performance water reducing agent or a high-performance AE water reducing agent. By mix | blending a water reducing agent, the fluidity | liquidity and workability of a compound, the denseness of a hardening body, intensity | strength, durability, etc. improve.
The blending amount of the water reducing agent is 0.1 to 4.0 parts by mass in terms of solid content with respect to 100 parts by mass of cement, from the viewpoint of fluidity and separation resistance of the compound, denseness of the cured product, strength and durability, cost, etc. Is preferable, 0.1 to 2.0 parts by mass is more preferable, and 0.1 to 1.0 part by mass is particularly preferable.
本発明で使用する補強用繊維は、直径0.012〜0.1mm（好ましくは0.012〜0.08mm、より好ましくは0.012〜0.06mm）のモノフィラメントタイプのアラミド繊維を、合成樹脂で集束した、直径0.15〜0.55mmで長さ1〜30mmの集束型のアラミド繊維である。
上記範囲外の直径のモノフィラメントタイプのアラミド繊維を合成樹脂で集束した集束型のアラミド繊維では、180N/mm2以上の圧縮強度を得ることが困難であり、また緻密性や耐久性等も低下する。
補強用繊維（集束型のアラミド繊維）の直径が0.15mm未満では、セメント組成物の流動性や作業性が低下するうえ、180N/mm2以上の圧縮強度を得ることが困難となる。一方、補強用繊維（集束型のアラミド繊維）の直径が0.55mmを越えると、同一配合量での本数が少なくなるので、耐磨耗性・耐衝撃性、曲げ強度や破壊エネルギーが低下することがある。また、圧縮強度も低下する。補強用繊維（集束型のアラミド繊維）の長さが1mm未満では、入手が困難であるうえ、耐久性、曲げ強度や破壊エネルギーが低下することがある。一方、補強用繊維（集束型のアラミド繊維）の長さが30mmを越えると、セメント組成物の流動性や作業性が極端に低下するうえ、180N/mm2以上の圧縮強度を得ることが困難となる。
なお、本発明においては、セメント組成物の流動性や作業性、強度発現性や耐久性等から、補強用繊維（集束型のアラミド繊維）の長さは、5〜25mmであることが好ましく、10〜20mmであることがより好ましい。
The reinforcing fiber used in the present invention is a monofilament type aramid fiber having a diameter of 0.012 to 0.1 mm (preferably 0.012 to 0.08 mm, more preferably 0.012 to 0.06 mm), which is bundled with a synthetic resin and has a diameter of 0.15 to 0.55 mm. It is a converged aramid fiber with a length of 1 to 30 mm.
It is difficult to obtain a compressive strength of 180 N / mm 2 or more with a bundled aramid fiber obtained by bundling monofilament type aramid fibers with a diameter outside the above range with a synthetic resin, and the compactness and durability are also reduced. .
If the diameter of the reinforcing fiber (bundled aramid fiber) is less than 0.15 mm, the fluidity and workability of the cement composition are lowered, and it becomes difficult to obtain a compressive strength of 180 N / mm 2 or more. On the other hand, if the diameter of the reinforcing fiber (bundled aramid fiber) exceeds 0.55mm, the number of fibers with the same compounding amount will decrease, resulting in a decrease in wear resistance, impact resistance, bending strength and fracture energy. There is. In addition, the compressive strength also decreases. If the length of the reinforcing fiber (bundled aramid fiber) is less than 1 mm, it is difficult to obtain and the durability, bending strength and fracture energy may be reduced. On the other hand, if the length of the reinforcing fiber (bundled aramid fiber) exceeds 30 mm, the fluidity and workability of the cement composition will be extremely reduced, and it will be difficult to obtain a compressive strength of 180 N / mm 2 or more. It becomes.
In the present invention, the length of the reinforcing fiber (bundled aramid fiber) is preferably 5 to 25 mm from the fluidity and workability of the cement composition, strength development and durability, etc. More preferably, it is 10-20 mm.
補強用繊維（集束型のアラミド繊維）の配合量は、
(1)該繊維の直径が0.15〜0.40mmの場合は、セメント組成物の体積の0.5〜3.0％が好ましく、より好ましくは0.8〜2.5％である。
一方、(2)該繊維の直径が0.40mmを超え0.55mm以下の場合は、セメント組成物の体積の0.5〜1.8％が好ましく、より好ましくは0.8〜1.5％である。
また、(3)直径が0.15〜0.40mmの繊維と直径が0.40mmを超え0.55mm以下の繊維を併用する場合は、直径が0.15〜0.40mmの繊維はセメント組成物の体積の0.5〜2.5％が好ましく、1.0〜2.5％がより好ましい。直径が0.40mmを超え0.55mm以下の繊維はセメント組成物の体積の0.5〜1.5％が好ましく、0.5〜1.3％がより好ましい。
補強用繊維（集束型のアラミド繊維）の配合量が前記の量未満では、曲げ強度や破壊エネルギー、特に破壊エネルギーが低下することがある。一方、配合量が前記の量を超えると、セメント組成物の流動性や作業性が極端に低下するうえ、圧縮強度も低下する。また、コストも高くなる。
The amount of reinforcing fiber (focused aramid fiber) is
(1) When the diameter of the fiber is 0.15 to 0.40 mm, 0.5 to 3.0% of the volume of the cement composition is preferable, and 0.8 to 2.5% is more preferable.
On the other hand, (2) when the fiber diameter exceeds 0.40 mm and is 0.55 mm or less, 0.5 to 1.8% of the volume of the cement composition is preferable, and more preferably 0.8 to 1.5%.
In addition, (3) when a fiber having a diameter of 0.15 to 0.40 mm and a fiber having a diameter of more than 0.40 mm and not more than 0.55 mm are used in combination, the fiber having a diameter of 0.15 to 0.40 mm is 0.5 to 2.5% of the volume of the cement composition. Is preferable, and 1.0 to 2.5% is more preferable. The fiber having a diameter of more than 0.40 mm and not more than 0.55 mm is preferably 0.5 to 1.5%, more preferably 0.5 to 1.3% of the volume of the cement composition.
If the amount of the reinforcing fiber (focused aramid fiber) is less than the above-mentioned amount, the bending strength and breaking energy, particularly breaking energy may be lowered. On the other hand, if the blending amount exceeds the above amount, the fluidity and workability of the cement composition are extremely lowered, and the compressive strength is also lowered. In addition, the cost increases.
モノフィラメントタイプのアラミド繊維を集束する合成樹脂としては、水硬性組成物の混練時にモノフィラメント繊維がばらけることのないように、非水溶性の合成樹脂が用いられる。また、該合成樹脂としては、集束繊維の強度の観点から、吸水率の小さな合成樹脂を用いることが望ましい。このような非水溶性で吸水率の小さな合成樹脂としては、例えば、エポキシ樹脂、ポリエステル、ビニロン、ナイロン、アクリル樹脂、塩化ビニル樹脂、ポリエチレン、ポリプロピレン等が挙げられる。中でも、エポキシ樹脂は、集束繊維の耐久性を向上させるので、好ましく用いられる。また、ポリエステル及びビニロンは、コストの点で、好ましく用いられる。これらの合成樹脂は、１種を単独で用いてもよいし、２種以上を併用してもよい。
補強用繊維（集束型のアラミド繊維）中に占める合成樹脂の体積割合は、好ましくは5〜30％、より好ましくは5〜20％である。該体積割合が５％未満では、繊維単糸同士の結合力が小さくなって、混練時に、水硬性組成物中で補強用繊維がばらけてしまい、モノフィラメント繊維の状態で分散するため流動性が極端に低下することがある。該体積割合が30％を超えると、補強用繊維自体の強度が低下するなどして、180N/mm2以上の圧縮強度を得ることが困難となる。
As the synthetic resin for bundling the monofilament type aramid fibers, a water-insoluble synthetic resin is used so that the monofilament fibers are not scattered when the hydraulic composition is kneaded. Further, as the synthetic resin, it is desirable to use a synthetic resin having a low water absorption rate from the viewpoint of the strength of the bundled fiber. Examples of such a water-insoluble synthetic resin having a low water absorption rate include epoxy resin, polyester, vinylon, nylon, acrylic resin, vinyl chloride resin, polyethylene, and polypropylene. Among them, the epoxy resin is preferably used because it improves the durability of the bundled fiber. Polyester and vinylon are preferably used in terms of cost. These synthetic resins may be used individually by 1 type, and may use 2 or more types together.
The volume ratio of the synthetic resin in the reinforcing fibers (bundled aramid fibers) is preferably 5 to 30%, more preferably 5 to 20%. When the volume ratio is less than 5%, the bonding strength between the single fibers is reduced, and the reinforcing fibers are dispersed in the hydraulic composition at the time of kneading and dispersed in the state of monofilament fibers. May decrease extremely. When the volume ratio exceeds 30%, it becomes difficult to obtain a compressive strength of 180 N / mm 2 or more because the strength of the reinforcing fiber itself decreases.
本発明においては、セメント組成物の流動性や作業性、硬化体の強度、緻密性や、耐久性等から、含水率が50質量％以下（より好ましくは10〜30質量％）のモノフィラメントタイプのアラミド繊維を合成樹脂で集束することが好ましい。モノフィラメントタイプのアラミド繊維の含水率が50質量％を越えると、強度発現性が低下することがあり、また、硬化体の緻密性や、耐久性等が低下することがある。
なお、本発明において、モノフィラメントタイプのアラミド繊維の含水率は、105℃で24時間加熱した際の質量減少量から算出される値である。
In the present invention, a monofilament type having a water content of 50% by mass or less (more preferably 10 to 30% by mass) from the fluidity and workability of the cement composition, the strength, denseness, durability and the like of the cured product. The aramid fibers are preferably bundled with a synthetic resin. When the water content of the monofilament type aramid fiber exceeds 50% by mass, strength development may be reduced, and the denseness and durability of the cured product may be reduced.
In the present invention, the water content of the monofilament type aramid fiber is a value calculated from the mass loss when heated at 105 ° C. for 24 hours.
本発明のセメント組成物においては、ブレーン比表面積が3500〜10000cm2/gの無機粉末を含有することができる。該無機粉末を含有することにより、流動性や硬化体の強度発現性、緻密性や、耐久性等を高めることができる。
無機粉末としては、スラグ、石灰石粉末、長石類、ムライト類、アルミナ粉末、石英粉末、フライアッシュ、火山灰、シリカゾル、炭化物粉末、窒化物粉末等が挙げられる。なかでも、スラグ、フライアッシュ、石灰石粉末、石英粉末は、コストの点や硬化体の品質安定性の点で好ましく用いられる。
無機粉末のブレーン比表面積は3500〜10000cm2/gが好ましく、4000〜9000cm2/gがより好ましく、5000〜9000cm2/gが特に好ましい。無機粉末のブレーン比表面積が3500cm2/g未満では、硬化体の強度、緻密性や、耐久性等が低下するため好ましくない。一方、該値が10000cm2/gを越えると、流動性が低下したり、硬化体の強度、緻密性や、耐久性等が低下することがある。さらに、この場合、コストも増大する。
無機粉末の配合量は、セメント100質量部に対して、好ましくは55質量部以下、より好ましくは10〜50質量部である。配合量が55質量部を越えると、流動性が低下したり、硬化体の強度、緻密性や、耐久性等が低下することがある。
In the cement composition of the present invention, an inorganic powder having a Blaine specific surface area of 3500 to 10000 cm 2 / g can be contained. By containing the inorganic powder, fluidity, strength development of the cured product, denseness, durability, and the like can be improved.
Examples of the inorganic powder include slag, limestone powder, feldspar, mullite, alumina powder, quartz powder, fly ash, volcanic ash, silica sol, carbide powder, and nitride powder. Of these, slag, fly ash, limestone powder, and quartz powder are preferably used in terms of cost and quality stability of the cured product.
Blaine specific surface area of the inorganic powder is preferably 3500~10000cm 2 / g, more preferably 4000~9000cm 2 / g, 5000~9000cm 2 / g is particularly preferred. If the Blaine specific surface area of the inorganic powder is less than 3500 cm 2 / g, the strength, denseness, durability, etc. of the cured product are lowered, which is not preferable. On the other hand, when the value exceeds 10000 cm 2 / g, the fluidity may be lowered, and the strength, denseness, durability, etc. of the cured product may be lowered. In this case, the cost also increases.
The blending amount of the inorganic powder is preferably 55 parts by mass or less, more preferably 10 to 50 parts by mass with respect to 100 parts by mass of cement. If the blending amount exceeds 55 parts by mass, the fluidity may decrease, and the strength, denseness, durability, etc. of the cured product may decrease.
本発明のセメント組成物においては、平均粒度が1mm以下の繊維状粒子又は薄片状粒子を含有することができる。ここで、粒子の粒度とは、その最大寸法の大きさ（特に、繊維状粒子ではその長さ）である。該繊維状粒子又は薄片状粒子を含有することにより、硬化後の靱性を高めることができる。
繊維状粒子としては、ウォラストナイト、ボーキサイト、ムライト等が、薄片状粒子としては、マイカフレーク、タルクフレーク、バーミキュライトフレーク、アルミナフレーク等が挙げられる。
繊維状粒子又は薄片状粒子の配合量は、流動性や施工性、硬化体の靱性等から、セメント100質量部に対して35質量部以下が好ましく、0.1〜5質量部がより好ましい。
なお、繊維状粒子においては、硬化体の靱性を高める観点から、長さ／直径の比で表される針状度が3以上のものを用いるのが好ましい。
The cement composition of the present invention can contain fibrous particles or flaky particles having an average particle size of 1 mm or less. Here, the particle size of the particle is the size of the maximum dimension (particularly, the length of the fibrous particle). By containing the fibrous particles or flaky particles, the toughness after curing can be increased.
Examples of fibrous particles include wollastonite, bauxite, mullite, and examples of flaky particles include mica flakes, talc flakes, vermiculite flakes, and alumina flakes.
The blending amount of the fibrous particles or flaky particles is preferably 35 parts by mass or less, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of cement, from the viewpoint of fluidity, workability, toughness of the cured body, and the like.
In addition, it is preferable to use a fibrous particle having a needle-like degree represented by a length / diameter ratio of 3 or more from the viewpoint of increasing the toughness of the cured body.
本発明においては、セメント組成物の混練方法は、特に限定されるものではなく、通常の方法を用いることができる。また、混練に用いる装置も特に限定されるものではなく、オムニミキサ、パン型ミキサ、二軸練りミキサ、傾胴ミキサ等が用いられる。
セメント組成物の成形・養生方法も、特に限定されるものではないが、本発明のセメント組成物を硬化してなるセメント質硬化体の生産性や強度発現性等を考慮すると、一次養生・二次養生を行う方法が好ましい。このような方法としては、例えば、以下のような方法が挙げられる。
まず、混練したセメント組成物を所定の型枠を用いて成形し、一次養生を行う。ここで、成形方法としては、特に限定されるものではなく、流し込み成形等の慣用の成形方法を採用することができる。一次養生の方法としては、型枠に混練したセメント組成物を収納した状態で、5〜40℃で所定時間、例えば3〜48時間静置する方法が挙げられる。一次養生終了後、脱型し、二次養生を行い、セメント質硬化体を製造する。一次養生終了後の脱型時におけるセメント質硬化体の圧縮強度は、10N/mm2以上であることが好ましい。圧縮強度が10N/mm2未満では、脱型が困難となる。二次養生の方法としては、75〜95℃で10〜48時間蒸気養生する方法が挙げられる。
In the present invention, the kneading method of the cement composition is not particularly limited, and a normal method can be used. Moreover, the apparatus used for kneading is not particularly limited, and an omni mixer, a pan-type mixer, a biaxial kneading mixer, a tilting cylinder mixer, and the like are used.
The molding / curing method of the cement composition is not particularly limited, but considering the productivity and strength development of a hardened cementitious material obtained by curing the cement composition of the present invention, the primary curing / seconding method is not limited. A method of performing the next curing is preferable. Examples of such methods include the following methods.
First, the kneaded cement composition is molded using a predetermined mold and subjected to primary curing. Here, the molding method is not particularly limited, and a conventional molding method such as casting can be employed. Examples of the primary curing method include a method in which the cement composition kneaded in a mold is stored and left at 5 to 40 ° C. for a predetermined time, for example, 3 to 48 hours. After the primary curing is completed, the mold is removed and subjected to secondary curing to produce a hardened cementitious material. The compressive strength of the hardened cementitious body at the time of demolding after the end of primary curing is preferably 10 N / mm 2 or more. If the compressive strength is less than 10 N / mm 2, demolding becomes difficult. Examples of the secondary curing method include a steam curing method at 75 to 95 ° C. for 10 to 48 hours.
本発明のセメント組成物は、「JIS R 5201（セメントの物理試験方法）11.フロー試験」に記載される方法において、15回の落下運動を行なわないで測定したフロー値が、200mm以上と流動性に優れるものであり、型枠への投入等の作業性に優れるものである。また、本発明のセメント組成物の硬化体は、180N/mm2以上、より好ましくは185N/mm2以上、特に好ましくは190N/mm2以上の圧縮強度を有するものである。さらに、本発明のセメント組成物の硬化体は、極めて緻密で、凍結融解抵抗性等の耐久性や非透水性、遮塩性等にも非常に優れている。
本発明のセメント組成物は、橋梁部材等の構造部材用途の他に、埋設型枠用ボード、ライニング材、コンクリート舗装、浮き床版や床版用補強材等の用途にも、好適に使用することができる。
The cement composition of the present invention has a flow value of 200 mm or more measured in the method described in “JIS R 5201 (Cement physical test method) 11. Flow test” without performing 15 drop motions. It is excellent in workability, and it is excellent in workability such as charging into a mold. The cured product of the cement composition of the present invention has a compressive strength of 180 N / mm 2 or more, more preferably 185 N / mm 2 or more, particularly preferably 190 N / mm 2 or more. Furthermore, the hardened body of the cement composition of the present invention is extremely dense, and is very excellent in durability such as freeze-thaw resistance, water impermeability, and salt barrier properties.
The cement composition of the present invention is suitably used for applications such as embedded formwork boards, lining materials, concrete pavements, floating floor slabs and floor slab reinforcements in addition to structural member applications such as bridge members. be able to.
次に、実施例を挙げて本発明をさらに説明するが、本発明は、これら実施例により限定されるものではない。
１．使用材料
以下に示す材料を使用した。
(a)セメント：低熱ポルトランドセメント（太平洋セメント(株)製）
(b)微粉末：シリカフューム（ＢＥＴ比表面積11m2/g）
(c)無機粉末：石英粉末（ブレーン比表面積7000cm2/g）
(d)細骨材：珪砂(粒径0.15〜0.6mm)
(e)減水剤：ポリカルボン酸系高性能減水剤
(f)水：水道水
(g)補強用繊維：
Ａ；直径0.26mm、長さ15mmの集束型のアラミド繊維（直径0.0125mm、長さ15mmのモノフィラメントタイプのアラミド繊維(含水率が15質量％)をエポキシ樹脂(住友スリーエム社製、商品名：スコッチウェルド)で集束したもの、補強用繊維中のエポキシ樹脂の含有率10体積％）
Ｂ；直径0.28mm、長さ15mmの集束型のアラミド繊維（直径0.045mm、長さ15mmのモノフィラメントタイプのアラミド繊維(含水率が15質量％)をエポキシ樹脂(住友スリーエム社製、商品名：スコッチウェルド)で集束したもの、補強用繊維中のエポキシ樹脂の含有率10体積％）
Ｃ；直径0.38mm、長さ15mmの集束型のアラミド繊維（直径0.0125mm、長さ15mmのモノフィラメントタイプのアラミド繊維(含水率が15質量％)をエポキシ樹脂(住友スリーエム社製、商品名：スコッチウェルド)で集束したもの、補強用繊維中のエポキシ樹脂の含有率10体積％）
Ｄ；直径0.48mm、長さ15mmの集束型のアラミド繊維（直径0.0125mm、長さ15mmのモノフィラメントタイプのアラミド繊維(含水率が15質量％)をエポキシ樹脂(住友スリーエム社製、商品名：スコッチウェルド)で集束したもの、補強用繊維中のエポキシ樹脂の含有率10体積％）
Ｅ：ポリビニルアルコール繊維（直径：0.3mm、長さ：15mm）
EXAMPLES Next, although an Example is given and this invention is further demonstrated, this invention is not limited by these Examples.
1. Materials used The following materials were used.
(a) Cement: Low heat Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
(b) Fine powder: Silica fume (BET specific surface area 11m 2 / g)
(c) Inorganic powder: Quartz powder (Blaine specific surface area 7000cm 2 / g)
(d) Fine aggregate: quartz sand (particle size 0.15-0.6mm)
(e) Water reducing agent: Polycarboxylic acid-based high-performance water reducing agent
(f) Water: Tap water
(g) Reinforcing fiber:
A: Concentrated aramid fiber (diameter: 0.26 mm, length: 15 mm) (monofilament type aramid fiber (water content: 15% by mass) with a diameter of 0.125 mm, length: 15 mm) epoxy resin (manufactured by Sumitomo 3M Ltd., trade name: Scotch) Welded together, epoxy resin content in reinforcing fiber 10% by volume)
B: Concentrated aramid fiber (diameter 0.045 mm, length 15 mm, monofilament type aramid fiber (water content 15 mass%) with a diameter of 0.28 mm and a length of 15 mm is an epoxy resin (manufactured by Sumitomo 3M Limited, trade name: Scotch) Welded together, epoxy resin content in reinforcing fiber 10% by volume)
C: Concentrated aramid fiber with a diameter of 0.38 mm and a length of 15 mm (monofilament type aramid fiber with a diameter of 0.0125 mm and a length of 15 mm (water content: 15% by mass) epoxy resin (manufactured by Sumitomo 3M Ltd., trade name: Scotch) Welded together, epoxy resin content in reinforcing fiber 10% by volume)
D: Converging type aramid fiber with a diameter of 0.48 mm and a length of 15 mm (monofilament type aramid fiber with a diameter of 0.0125 mm and a length of 15 mm (water content: 15% by mass)) epoxy resin (manufactured by Sumitomo 3M Ltd., trade name: Scotch) Welded together, epoxy resin content in reinforcing fiber 10% by volume)
E: Polyvinyl alcohol fiber (diameter: 0.3mm, length: 15mm)
２．セメント組成物の製造と評価１
低熱ポルトランドセメント100質量部、シリカフューム30質量部、石英粉末30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ａ（セメント組成物の体積の1％）を二軸練りミキサに投入し、混練した。
上記セメント組成物のフロー値を、「JIS R 5201（セメントの物理試験方法）11.フロー試験」に記載される方法において、15回の落下運動を行なわないで測定した。その結果、フロー値は280mmであった。
また、上記セメント組成物をφ50×100mmの型枠に流し込み、20℃で48時間前置き後、90℃で48時間蒸気養生し、硬化体（３本）を得た。該硬化体の圧縮強度（３本の平均値）は185N/mm2であった。
また、上記セメント組成物を4×4×16cmの型枠に流し込み、20℃で48時間前置き後、90℃で48時間蒸気養生し、硬化体（３本）を得た。該硬化体の曲げ強度（３本の平均値）は25N/mm2であった。
また、上記セメント組成物をφ50×100mmの型枠に流し込み、20℃で48時間前置き後、90℃で48時間蒸気養生し、硬化体（３本）を得た。該硬化体の透水係数を「地盤工学会基準ＪＧＳ ０２３１（土の透水試験法）」に準じて、変水位透水試験方法により測定した。その結果、水の浸透が全く認められず、浸透深さはゼロであった。
また、上記セメント組成物を10×10×40cmの型枠に流し込み、20℃で48時間前置き後、90℃で48時間蒸気養生し、硬化体（３本）を得た。該硬化体の凍結融解試験を「JIS A 1148（コンクリートの凍結融解試験方法）」に準じて測定した。その結果、耐久性指数（３本の平均値）は、99.6であった。
また、別途、「ASTM C779」に記載されている寸法の供試体を作製（20℃で48時間前置き後、90℃で48時間蒸気養生）し、「ASTM C779」に準じて耐磨耗性を評価した。その結果、60分経過後のすりへり深さは0.69mmであった。
また、別途、「ASTM C418」に記載されている寸法の供試体を作製（20℃で48時間前置き後、90℃で48時間蒸気養生）し、「ASTM C418」に準じて耐磨耗性を評価した。その結果、すりへり体積は0.013cm3/cm3であった。
2. Manufacture and evaluation of cement compositions 1
Low heat Portland cement 100 parts by weight, silica fume 30 parts by weight, quartz powder 30 parts by weight, fine aggregate 120 parts by weight, water 22 parts by weight, high-performance water reducing agent 0.4 parts by weight (solid content conversion) and reinforcing fiber A (cement composition) 1% of the volume of the product was put into a biaxial kneader and kneaded.
The flow value of the cement composition was measured in the method described in “JIS R 5201 (Cement physical test method) 11. Flow test” without performing 15 drop motions. As a result, the flow value was 280 mm.
Further, the cement composition was poured into a mold of φ50 × 100 mm, preliminarily placed at 20 ° C. for 48 hours, and then subjected to steam curing at 90 ° C. for 48 hours to obtain hardened bodies (three pieces). The cured body had a compressive strength (average value of three) of 185 N / mm 2 .
Further, the cement composition was poured into a 4 × 4 × 16 cm mold, preliminarily placed at 20 ° C. for 48 hours, and then subjected to steam curing at 90 ° C. for 48 hours to obtain hardened bodies (three pieces). The bending strength (average value of three pieces) of the cured body was 25 N / mm 2 .
Further, the cement composition was poured into a mold of φ50 × 100 mm, preliminarily placed at 20 ° C. for 48 hours, and then subjected to steam curing at 90 ° C. for 48 hours to obtain hardened bodies (three pieces). The water permeability coefficient of the cured body was measured by a water level permeability test method according to “Geotechnical Society Standard JGS 0231 (Soil permeability test method)”. As a result, no water penetration was observed, and the penetration depth was zero.
Further, the cement composition was poured into a 10 × 10 × 40 cm mold, preliminarily placed at 20 ° C. for 48 hours, and then subjected to steam curing at 90 ° C. for 48 hours to obtain hardened bodies (three pieces). The freeze-thaw test of the cured body was measured according to “JIS A 1148 (Method of freeze-thawing concrete). As a result, the durability index (average value of 3 pieces) was 99.6.
Separately, a specimen with the dimensions described in “ASTM C779” was prepared (previously at 20 ° C. for 48 hours and then steam-cured at 90 ° C. for 48 hours), and the wear resistance according to “ASTM C779” evaluated. As a result, the depth of wear after 60 minutes was 0.69 mm.
Separately, a specimen having the dimensions described in “ASTM C418” was prepared (previously at 20 ° C. for 48 hours and then steam-cured at 90 ° C. for 48 hours), and the wear resistance according to “ASTM C418” evaluated. As a result, abrasion volume was 0.013cm 3 / cm 3.
３．セメント組成物の製造と評価２
低熱ポルトランドセメント100質量部、シリカフューム30質量部、石英粉末30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ａ（セメント組成物の体積の２％）を二軸練りミキサに投入し、混練した。
セメント組成物のフロー値、硬化体の圧縮強度、曲げ強度、水の浸透深さ、耐久性指数、すりへり深さ及びすりへり体積を、上記２．と同様に測定した。
その結果、フロー値は250mm、圧縮強度は193N/mm2、曲げ強度は35N/mm2、水の浸透深さはゼロ、耐久性指数は99.8、すりへり深さは0.68mm、すりへり体積は0.012cm3/cm3であった。
3. Manufacture and evaluation of cement composition 2
Low heat Portland cement 100 parts by weight, silica fume 30 parts by weight, quartz powder 30 parts by weight, fine aggregate 120 parts by weight, water 22 parts by weight, high-performance water reducing agent 0.4 parts by weight (solid content conversion) and reinforcing fiber A (cement composition) 2% of the volume of the product) was put into a biaxial kneader and kneaded.
The flow value of the cement composition, the compressive strength, the bending strength, the water penetration depth, the durability index, the grinding depth and the grinding volume of the cured product are described in the above 2. Was measured in the same manner.
As a result, the flow value is 250 mm, the compressive strength is 193 N / mm 2 , the bending strength is 35 N / mm 2 , the water penetration depth is zero, the durability index is 99.8, the grooving depth is 0.68 mm, and the rub volume is 0.012 cm 3 / cm 3 .
４．セメント組成物の製造と評価３
低熱ポルトランドセメント100質量部、シリカフューム30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ｂ（セメント組成物の体積の２％）を二軸練りミキサに投入し、混練した。
セメント組成物のフロー値、硬化体の圧縮強度、曲げ強度、水の浸透深さ、耐久性指数、すりへり深さ及びすりへり体積を、上記２．と同様に測定した。
その結果、フロー値は230mm、圧縮強度は195N/mm2、曲げ強度は32N/mm2、水の浸透深さはゼロ、耐久性指数は99.7、すりへり深さは0.68mm、すりへり体積は0.012cm3/cm3であった。
4). Manufacture and evaluation of cement composition 3
Low heat Portland cement 100 parts by weight, silica fume 30 parts by weight, fine aggregate 120 parts by weight, water 22 parts by weight, high-performance water reducing agent 0.4 parts by weight (solid content conversion) and reinforcing fiber B (2% of the volume of the cement composition) ) Was put into a biaxial kneader and kneaded.
The flow value of the cement composition, the compressive strength, the bending strength, the water penetration depth, the durability index, the grinding depth and the grinding volume of the cured product are described in the above 2. Was measured in the same manner.
As a result, the flow value is 230 mm, the compressive strength is 195 N / mm 2 , the bending strength is 32 N / mm 2 , the water penetration depth is zero, the durability index is 99.7, the ground depth is 0.68 mm, and the ground volume is 0.012 cm 3 / cm 3 .
５．セメント組成物の製造と評価４
低熱ポルトランドセメント100質量部、シリカフューム30質量部、石英粉末30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ｂ（セメント組成物の体積の２％）を二軸練りミキサに投入し、混練した。
セメント組成物のフロー値、硬化体の圧縮強度、曲げ強度、水の浸透深さ、耐久性指数、すりへり深さ及びすりへり体積を、上記２．と同様に測定した。
その結果、フロー値は240mm、圧縮強度は204N/mm2、曲げ強度は35N/mm2、水の浸透深さはゼロ、耐久性指数は99.9、すりへり深さは0.67mm、すりへり体積は0.012cm3/cm3であった。
5). Manufacture and evaluation of cement compositions 4
Low heat Portland cement 100 parts by mass, silica fume 30 parts by mass, quartz powder 30 parts by mass, fine aggregate 120 parts by mass, water 22 parts by mass, high-performance water reducing agent 0.4 parts by mass (solid content conversion) and reinforcing fiber B (cement composition) 2% of the volume of the product) was put into a biaxial kneader and kneaded.
The flow value of the cement composition, the compressive strength, the bending strength, the water penetration depth, the durability index, the grinding depth and the grinding volume of the cured product are described in the above 2. Was measured in the same manner.
As a result, the flow value is 240 mm, the compressive strength is 204 N / mm 2 , the bending strength is 35 N / mm 2 , the water penetration depth is zero, the durability index is 99.9, the grinding depth is 0.67 mm, and the grinding volume is 0.012 cm 3 / cm 3 .
６．セメント組成物の製造と評価５
低熱ポルトランドセメント100質量部、シリカフューム30質量部、石英粉末30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ｃ（セメント組成物の体積の２％）を二軸練りミキサに投入し、混練した。
セメント組成物のフロー値、硬化体の圧縮強度、曲げ強度、水の浸透深さ、耐久性指数、すりへり深さ及びすりへり体積を、上記２．と同様に測定した。
その結果、フロー値は275mm、圧縮強度は184N/mm2、曲げ強度は27N/mm2、水の浸透深さはゼロ、耐久性指数は99.6、すりへり深さは0.70mm、すりへり体積は0.013cm3/cm3であった。
6). Production and evaluation of cement composition 5
Low heat Portland cement 100 parts by mass, silica fume 30 parts by mass, quartz powder 30 parts by mass, fine aggregate 120 parts by mass, water 22 parts by mass, high-performance water reducing agent 0.4 parts by mass (in terms of solid content) and reinforcing fiber C (cement composition) 2% of the volume of the product) was put into a biaxial kneader and kneaded.
The flow value of the cement composition, the compressive strength, the bending strength, the water penetration depth, the durability index, the grinding depth and the grinding volume of the cured product are described in the above 2. Was measured in the same manner.
As a result, the flow value is 275 mm, compressive strength 184N / mm 2, bending strength of 27N / mm 2, the depth of penetration of the water-zero, durability index 99.6, abrasion depth 0.70 mm, abrasion volume 0.013cm 3 / cm 3 .
７．セメント組成物の製造と評価６
低熱ポルトランドセメント100質量部、シリカフューム30質量部、石英粉末30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ｄ（セメント組成物の体積の１％）を二軸練りミキサに投入し、混練した。
セメント組成物のフロー値、硬化体の圧縮強度、曲げ強度を、上記２．と同様に測定した。
その結果、フロー値は290mm、圧縮強度は185N/mm2、曲げ強度は25N/mm2であった。
7). Production and evaluation of cement composition 6
Low heat Portland cement 100 parts by weight, silica fume 30 parts by weight, quartz powder 30 parts by weight, fine aggregate 120 parts by weight, water 22 parts by weight, high-performance water reducing agent 0.4 parts by weight (in terms of solid content) and reinforcing fiber D (cement composition) 1% of the volume of the product) was put into a biaxial kneader and kneaded.
The flow value of the cement composition, the compressive strength and the bending strength of the cured body are set as described in 2. above. Was measured in the same manner.
As a result, the flow value is 290 mm, compressive strength 185 N / mm 2, bending strength was 25 N / mm 2.
８．セメント組成物の製造と評価７
低熱ポルトランドセメント100質量部、シリカフューム30質量部、石英粉末30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ｅ（セメント組成物の体積の３％）を二軸練りミキサに投入し、混練した。
セメント組成物のフロー値、硬化体の圧縮強度、曲げ強度を、上記２．と同様に測定した。
その結果、フロー値は260mm、圧縮強度は165N/mm2、曲げ強度は21N/mm2であった。
8). Manufacture and evaluation of cement compositions 7
Low heat Portland cement 100 parts by mass, silica fume 30 parts by mass, quartz powder 30 parts by mass, fine aggregate 120 parts by mass, water 22 parts by mass, high-performance water reducing agent 0.4 parts by mass (solid content conversion) and reinforcing fiber E (cement composition) 3% of the product volume) was put into a biaxial kneader and kneaded.
The flow value of the cement composition, the compressive strength and the bending strength of the cured body are set as described in 2. above. Was measured in the same manner.
As a result, the flow value is 260 mm, compressive strength 165 N / mm 2, bending strength was 21N / mm 2.
９．セメント組成物の製造と評価８
低熱ポルトランドセメント100質量部、シリカフューム30質量部、石英粉末30質量部、細骨材120質量部、水22質量部、高性能減水剤0.4質量部（固形分換算）及び補強用繊維Ｄ（セメント組成物の体積の２％）を二軸練りミキサに投入し、混練した。
セメント組成物のフロー値、硬化体の圧縮強度、曲げ強度を、上記２．と同様に測定した。
その結果、フロー値は260mm、圧縮強度は170N/mm2、曲げ強度は26N/mm2であった。
9. Manufacture and evaluation of cement composition 8
Low heat Portland cement 100 parts by weight, silica fume 30 parts by weight, quartz powder 30 parts by weight, fine aggregate 120 parts by weight, water 22 parts by weight, high-performance water reducing agent 0.4 parts by weight (in terms of solid content) and reinforcing fiber D (cement composition) 2% of the volume of the product) was put into a biaxial kneader and kneaded.
The flow value of the cement composition, the compressive strength and the bending strength of the cured body are set as described in 2. above. Was measured in the same manner.
As a result, the flow value is 260 mm, compressive strength 170N / mm 2, bending strength was 26N / mm 2.
10．普通コンクリートの耐磨耗性の評価
普通コンクリートの配合物（単位セメント(普通ポルトランドセメント使用)量327kg/m3、単位水量180kg/m3、細骨材率48％、空気量4.5％の条件）の硬化体を使用して、すりへり深さ及びすりへり体積を、上記２．と同様に測定した(なお、養生は20℃の水中養生を行なった。該普通コンクリートの圧縮強度は35N/mm2であった)。
その結果、すりへり深さは1.74mm、すりへり体積は0.105cm3/cm3であった。
Ten. Evaluation of wear resistance of ordinary concrete Mixture of ordinary concrete (unit cement (using ordinary Portland cement) amount 327kg / m 3 , unit water amount 180kg / m 3 , fine aggregate rate 48%, air amount 4.5%) Using the cured product, the depth of grinding and the volume of grinding are determined according to 2. (The curing was performed under water curing at 20 ° C. The compressive strength of the ordinary concrete was 35 N / mm 2 ).
As a result, abrasion depth 1.74 mm, abrasion volume was 0.105cm 3 / cm 3.
上記のように、本発明のセメント組成物では、優れた機械的特性（圧縮強度、曲げ強度）や耐久性が得られること、特に、従来有機繊維を含有するセメント質硬化体では困難であった180N/mm2以上の圧縮強度を発現できることが分かる。 As described above, with the cement composition of the present invention, excellent mechanical properties (compressive strength, bending strength) and durability can be obtained, and in particular, it has been difficult with conventional hardened cementitious materials containing organic fibers. It can be seen that a compressive strength of 180 N / mm 2 or more can be expressed.
Claims (6)
前記補強用繊維が、直径0.012〜0.1mmのモノフィラメントタイプのアラミド繊維を合成樹脂で集束した、直径0.15〜0.55mmで長さ1〜30mmの集束型のアラミド繊維であることを特徴とするセメント組成物。 A cement composition comprising cement, fine powder having a BET specific surface area of 3 to 25 m 2 / g, fine aggregate, reinforcing fiber, water reducing agent and water,
Cement composition characterized in that the reinforcing fiber is a bundled aramid fiber having a diameter of 0.15 to 0.55 mm and a length of 1 to 30 mm obtained by bundling monofilament type aramid fibers having a diameter of 0.012 to 0.1 mm with a synthetic resin object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010112925A JP2011084458A (en) | 2009-09-15 | 2010-05-17 | Cement composition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009213208 | 2009-09-15 | ||
| JP2010112925A JP2011084458A (en) | 2009-09-15 | 2010-05-17 | Cement composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2011084458A true JP2011084458A (en) | 2011-04-28 |
Family
ID=44077699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010112925A Pending JP2011084458A (en) | 2009-09-15 | 2010-05-17 | Cement composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2011084458A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013001583A (en) * | 2011-06-14 | 2013-01-07 | Taiheiyo Cement Corp | Composite member |
| JP2013023416A (en) * | 2011-07-22 | 2013-02-04 | Taiheiyo Cement Corp | Cement composition |
| JP2013043816A (en) * | 2011-08-26 | 2013-03-04 | Nippon Steel & Sumikin Materials Co Ltd | Hardened cement paste reinforcing material |
| JP2013053043A (en) * | 2011-09-02 | 2013-03-21 | Misawa Homes Co Ltd | Calcium silicate hydrate-based building material |
| JP2013203590A (en) * | 2012-03-28 | 2013-10-07 | Taiheiyo Cement Corp | Fiber-reinforced extremely stiff consistency concrete and method for producing the same |
| JP2015074592A (en) * | 2013-10-10 | 2015-04-20 | 太平洋セメント株式会社 | Insert |
| JP2021088494A (en) * | 2019-12-06 | 2021-06-10 | 太平洋セメント株式会社 | Cement composition and method for producing cement hardening body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002348167A (en) * | 2001-05-29 | 2002-12-04 | Taiheiyo Cement Corp | Hydraulic composition |
| JP2003327462A (en) * | 2002-05-10 | 2003-11-19 | Kuraray Co Ltd | Hydraulic kneaded molded body |
| JP2004352575A (en) * | 2003-05-30 | 2004-12-16 | Taiheiyo Cement Corp | Reinforcing fiber for hydraulic composition and hydraulic composition containing the same |
-
2010
- 2010-05-17 JP JP2010112925A patent/JP2011084458A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002348167A (en) * | 2001-05-29 | 2002-12-04 | Taiheiyo Cement Corp | Hydraulic composition |
| JP2003327462A (en) * | 2002-05-10 | 2003-11-19 | Kuraray Co Ltd | Hydraulic kneaded molded body |
| JP2004352575A (en) * | 2003-05-30 | 2004-12-16 | Taiheiyo Cement Corp | Reinforcing fiber for hydraulic composition and hydraulic composition containing the same |
Non-Patent Citations (2)
| Title |
|---|
| 竹山忠臣: "アラミド繊維を用いた超高強度繊維補強コンクリートに関する研究", コンクリート工学年次論文集, vol. 第３１巻、第１号, JPN7013004334, July 2009 (2009-07-01), JP, pages 313 - 318, ISSN: 0002691851 * |
| 笠井芳夫，坂井悦郎, 新 セメント・コンクリート用混和材料, vol. 第１版, JPN6013058820, 15 January 2007 (2007-01-15), JP, pages 71, ISSN: 0002691852 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013001583A (en) * | 2011-06-14 | 2013-01-07 | Taiheiyo Cement Corp | Composite member |
| JP2013023416A (en) * | 2011-07-22 | 2013-02-04 | Taiheiyo Cement Corp | Cement composition |
| JP2013043816A (en) * | 2011-08-26 | 2013-03-04 | Nippon Steel & Sumikin Materials Co Ltd | Hardened cement paste reinforcing material |
| JP2013053043A (en) * | 2011-09-02 | 2013-03-21 | Misawa Homes Co Ltd | Calcium silicate hydrate-based building material |
| JP2013203590A (en) * | 2012-03-28 | 2013-10-07 | Taiheiyo Cement Corp | Fiber-reinforced extremely stiff consistency concrete and method for producing the same |
| JP2015074592A (en) * | 2013-10-10 | 2015-04-20 | 太平洋セメント株式会社 | Insert |
| JP2021088494A (en) * | 2019-12-06 | 2021-06-10 | 太平洋セメント株式会社 | Cement composition and method for producing cement hardening body |
| JP7433031B2 (en) | 2019-12-06 | 2024-02-19 | 太平洋セメント株式会社 | Cement composition and method for producing hardened cementitious body |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Memon et al. | A review on self compacting concrete with cementitious materials and fibers | |
| Topcu et al. | Utilization of crushed tile as aggregate in concrete | |
| WO2002096825A1 (en) | Hydraulic composition | |
| JP2011084458A (en) | Cement composition | |
| JP5101355B2 (en) | Cement composition | |
| JP2004323294A (en) | Concrete | |
| JP2001240440A (en) | Steel fiber for reinforcing concrete and fiber reinforced concrete | |
| JP4298247B2 (en) | High fluidity concrete | |
| JP4809575B2 (en) | Cement composition for civil engineering structure and concrete product using the same | |
| JP2002348167A (en) | Hydraulic composition | |
| JP2004339043A (en) | Hydraulic composition and hardened body | |
| JP4039801B2 (en) | Hydraulic composition | |
| JP2004155623A (en) | Prestressed concrete | |
| JP4376409B2 (en) | Joint joint material for post tension prestressed concrete plate | |
| JP4167787B2 (en) | Composite material | |
| JP2010120798A (en) | Cement composition | |
| JP2004224639A (en) | Slab member | |
| JP2005082470A (en) | Concrete board | |
| JP2001207442A (en) | Sheet pile | |
| JP2001225891A (en) | Structure for water storage | |
| JP2003267764A (en) | Reinforcing plate | |
| JP4167373B2 (en) | Hand hole | |
| JP2001207577A (en) | Embedded form | |
| JP2004323262A (en) | Panel for assembly wall | |
| JP2001220200A (en) | Water-sealing material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20130404 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20131120 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20131203 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20140129 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20140924 |