JP2018193280A - Quick-hardening ultrahigh-strength grout composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily knead without using a special device, the kneaded grout material has excellent fluidity and can be easily pumped by a grout pump, and 120 N / mm2 at a material age of 7 days without steam curing. Provided is a fast-strength ultra-high-strength grout composition capable of obtaining the above compressive strength. SOLUTION: For 100 parts by mass of a binder containing cement, amorphous aluminosilicate mineral powder, gypsum, water reducing agent, thickener and fine aggregate, and containing cement, amorphous aluminosilicate mineral powder and gypsum. , Cement 70-90 parts by mass, Amorphous aluminosilicate mineral powder 8-18 parts by mass, Gypsum 4-12 parts by mass, Fine aggregate 40-70 parts by mass, Water reducing agent 0.15-1.80 parts by mass, Increase The fine aggregate contains 0.005 to 0.12 parts by mass of a viscous agent, and the proportion of particles exceeding 2.5 mm is 25% by mass or less, and particles of 0.15 mm or less are 15% by mass or less and 0.3 mm. An early-strength ultra-high-strength glaut composition in which particles of more than 2.5 mm and 25 mm or less are 70% by mass or more. [Selection diagram] None

Description

  The present invention relates to an early strength ultra high strength grout composition.

Cement-type grout materials with high fluidity are widely used in the construction or repair of civil engineering structures and building structures, or in the installation of machines.
Building structures tend to be super-high-rise or large-scale, and the structure itself is required to have high strength for high-rise or large-scale construction. For this reason, a high strength grout material is required for use in joints of various members. In addition, a grout material used for repairing a structure is required to have high strength.
In order to obtain a high-strength grout material, cement-type grout materials in which pozzolans such as silica fume and metakaolin are mixed with cement to reduce the water cement ratio (water binder ratio) have been proposed (for example, Patent Documents 1 and 2). reference). More recently, there is a demand for an early-strength ultrahigh-strength grout composition capable of obtaining higher strength at an earlier stage than the inventions described in Patent Documents 1 and 2.

  In order to obtain higher strength at an earlier stage, it is conceivable to add or increase the amount of a quick-hardening admixture (agent), knead with a lower water cement ratio (water binder ratio), or heat cure. However, simply adding or increasing the amount of the quick-setting admixture (agent), or kneading at a lower water cement ratio (water binder ratio), the fluidity decreases and the grout material cannot be used. Mixing is difficult to perform, and mixing cannot be performed unless a mixer having strong mixing performance such as a forced biaxial concrete mixer is used. Moreover, it is difficult to heat and cure at the construction site, which is costly and troublesome.

Under such circumstances, a high strength grout composition containing a siliceous fine powder (silica fume) having a silicon dioxide content of 90% or more and a ferronickel slag having a density of 3.0 g / cm ³ or more and having a low water / binder ratio. The thing is also proposed (for example, refer patent document 3).

JP 2008-143759 A JP 2011-136863 A JP 2008-094675 A

However, a high-strength grout composition such as Patent Document 3 is difficult to knead, and a mixer or a high-speed hand of a type in which a stirring blade is disposed at the bottom of the mixing layer and the stirring blade is rotated at high speed to knead the grout composition with water. When trying to knead with a mixer, there is a problem that kneading cannot be performed, and even if kneading can be performed, a load is applied to the mixer excessively, or the kneading time takes time. Furthermore, since a heavy aggregate with a density of 3.0 g / cm ³ or more is blended as a fine aggregate, there is a risk of material separation when pumped over long distances with a grout pump, which may hinder workability. There is.

Therefore, the present invention is easy to knead without using a special device, the kneaded grout material is excellent in fluidity and can be easily pumped with a grout pump, and the material age is 7 days without steam curing. It is an object of the present invention to provide an early-strength ultrahigh-strength grout composition capable of obtaining a compressive strength of 120 N / mm ² or more.

Therefore, as a result of various investigations by blending cement, amorphous aluminosilicate mineral powder, gypsum, water reducing agent, thickener, and fine aggregate, the present inventor has included these components in specific ratios, respectively. By setting the aggregate to a specific particle size distribution, it is easy to knead using a mixer that is usually used in the field, the fluidity of the kneaded grout is good, and it can be easily pumped with a grout pump, and steam curing It was found that an early-strength ultrahigh-strength grout composition capable of obtaining an excellent compressive strength of 120 N / mm ² or more at a material age of 7 days can be obtained without carrying out the process.

  That is, the present invention provides the following inventions [1] to [5].

[1] Cement, amorphous aluminosilicate mineral powder, gypsum, water reducing agent, thickener and fine aggregate, and 100 parts by mass of binder containing cement, amorphous aluminosilicate mineral powder and gypsum, 70-90 parts by mass of cement, 8-18 parts by mass of amorphous aluminosilicate mineral powder, 4-12 parts by mass of gypsum, 40-70 parts by mass of fine aggregate, 0.15-1.80 parts by mass of water reducing agent, thickening 0.005 to 0.12 parts by mass of agent,
In the fine aggregate, the proportion of particles exceeding 2.5 mm is 25% by mass or less, the particles of 0.15 mm or less are 15% by mass or less, and the particles exceeding 0.3 mm and 2.5 mm or less are 70% by mass or more. An early strength ultra high strength grout composition.
[2] The early-strength ultrahigh-strength grout composition of the above-mentioned [1], wherein the fine aggregate has a particle size of not less than 0.3 mm and not more than 2.5 mm of 90% by mass or more.
[3] The early-strength ultrahigh-strength grout composition according to [1] or [2], which is used at a water binder ratio of 20 to 30%.
[4] The early-strength ultrahigh-strength grout composition according to any one of the above [1] to [3], wherein the thickener is water-soluble cellulose having a viscosity of 100 to 1500 mPa · s at 20 ° C. object.
[5] The above [1] to [4] further containing 0.03 to 0.2 parts by mass of an antifoaming agent with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. Any early strength ultra high strength grout composition.

According to the present invention, it is easy to knead, the kneaded grout material is excellent in fluidity, and a high strength ultra high strength grout that can obtain a compressive strength of 120 N / mm ² or more at a material age of 7 days without steam curing. A composition can be provided.
Further, according to the present invention, even if the stirring blade is arranged at the bottom of the mixed layer and the stirring blade is rotated at a high speed to knead the grout composition with water or kneaded with a high-speed hand mixer, it is easy to knead. The kneaded grout material is excellent in fluidity and can be easily pumped by a grout pump, and it is a high strength ultra high strength grout that can obtain a compressive strength of 120 N / mm ² or more at 7 days of age without steam curing. A composition can be provided.
According to the present invention, in construction work such as a high-strength building structure, a grout mixed with a grout mixer in which a stirring blade is disposed at the bottom of a general mixed layer and the stirring blade is rotated at high speed is pumped using a grout pump. By carrying out construction, a compressive strength of 120 N / mm ² or more is obtained at a material age of 7 days, and there is an advantage that the work period can be shortened and the work efficiency can be improved in the construction.

The early-strength ultrahigh-strength grout composition of the present invention comprises cement, amorphous aluminosilicate mineral powder, gypsum, water reducing agent, thickener and fine aggregate, and cement, amorphous aluminosilicate mineral powder and gypsum. 70 to 90 parts by mass of cement, 8 to 18 parts by mass of amorphous aluminosilicate mineral powder, 4 to 12 parts by mass of gypsum, 40 to 70 parts by mass of fine aggregate, and 0 water reducing agent. .15 to 1.80 parts by mass, thickener 0.005 to 0.12 parts by mass,
In the fine aggregate, the proportion of particles exceeding 2.5 mm is 25% by mass or less, the particles of 0.15 mm or less are 15% by mass or less, and the particles exceeding 0.3 mm and 2.5 mm or less are 70% by mass or more. It is characterized by that.

  The cement used in the early-strength ultra-high-strength grout composition of the present invention may be a hydraulic cement. For example, various ordinary Portland cements, eco-cements, and these are usually used. Examples include various mixed cements in which fly ash, blast furnace slag, silica fume, fine limestone powder, or the like is mixed with Portland cement or eco-cement, and one or more of these can be used. It is difficult to impair workability, it is easy to ensure a long pot life and high compressive strength at 7 days of age. Therefore, it is possible to use one or more selected from ordinary Portland cement, early-strength Portland cement and eco-cement. preferable.

In the early-strength ultrahigh-strength grout composition of the present invention, the cement content is 70 to 90 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. If it is less than 70 parts by mass, it is difficult to ensure fluidity as a grout while suppressing material separation. When it exceeds 90 parts by mass, it is difficult to set the compressive strength at 7 days of age to 120 N / mm ² or more while securing the fluidity as a grout. Since it is difficult to separate the materials, the compressive strength is higher at 7 days of age, and good fluidity as a grout can be obtained. Therefore, the binder 100 contains cement, amorphous aluminosilicate mineral powder, and gypsum. It is preferable to set it as 75-85 mass parts with respect to a mass part, and it is still more preferable to set it as 76-84 mass parts.

The amorphous aluminosilicate mineral powder used in the present invention is amorphous among the minerals containing SiO ₂ and Al ₂ O ₃ as main chemical components. The term “amorphous” as used herein means that no peak is observed in the measurement by a powder X-ray diffractometer. The amorphous aluminosilicate mineral powder used in the present invention has an amorphous ratio of 70% by mass or more. What is necessary is just 90 mass% or more, More preferably, it is 100 mass%, More preferably, the peak is not seen at all by the measurement by a powder X-ray diffractometer. Aluminosilicate mineral powder with a low proportion of amorphous, that is, aluminosilicate mineral powder with a high proportion of crystalline, has poor strength development at the same mixing amount compared to aluminosilicate mineral powder with a high proportion of amorphous, More aluminosilicate mineral powder is required to obtain the same strength. Amorphous aluminosilicate mineral powders used in the present invention, in addition to SiO ₂ and _{Al 2 O 3, TiO 2,} Fe 2 O 3, CaO, MgO, K 2 O, the minor component of the Na ₂ O or the like included May be. The total amount of the trace components is preferably 20% by mass or less from the viewpoint of increasing the compressive strength of the grout, and each trace component other than SiO ₂ and Al ₂ O ₃ is more preferably 2.5% by mass or less. The amorphous aluminosilicate mineral powder used in the present invention is obtained by heating a crystalline aluminosilicate mineral containing SiO ₂ and Al ₂ O ₂ as main chemical components into an amorphous state. It is obtained by doing. Further, in viewpoint of early exhibit strength development, it is preferable that Al ₂ O ₂ component is more than 30 wt%. It may be made into a powder before amorphization by heating. The crystalline aluminosilicate mineral used here may contain crystal water or a hydroxyl group in the mineral. The amorphous aluminosilicate mineral powder used in the present invention is an amorphous aluminosilicate mineral powder that has been made amorphous by heating kaolin minerals (clay minerals) such as kaolinite, halosite, and dickite. It is preferable because a relatively stable product is easily available and the physical properties of the mixed grout are relatively stable. Examples of the heating for making the aluminosilicate mineral amorphous include firing with an external heat kiln, internal heat kiln, electric furnace, etc., melting with a melting furnace, and the like.

The fineness of the amorphous aluminosilicate mineral powder used in the present invention is a ratio defined in JIS R 5201-1997 from the viewpoint of obtaining good fluidity as a grout and a high compressive strength at 7 days of age. The value of the Blaine specific surface area measured by the surface area test is preferably in the range of 15000 to 45000 cm ² / g. The fineness of the more preferable amorphous aluminosilicate mineral powder is in the range of 20000 to 40,000 cm ² / g in terms of Blaine specific surface area.

  In the early-strength ultrahigh-strength grout composition of the present invention, the content of the amorphous aluminosilicate mineral powder is 8 to 18 with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. Mass parts. If the amount is less than 8 parts by mass, the strength is insufficient, or in order to obtain the strength, the amount of water must be less than 20% of the water binder ratio, so that mixing becomes difficult. When the content of the amorphous aluminosilicate mineral powder exceeds 18 parts by mass, it becomes difficult to obtain fluidity, and when the amount of water or water reducing agent is increased in order to ensure fluidity as a grout, the strength is insufficient. The content of the amorphous aluminosilicate mineral powder is set to 8.3 to 16 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. It is more preferable in terms of easy strength while ensuring good fluidity.

The gypsum used in the early-strength ultra-high-strength grout composition of the present invention is not particularly limited as long as it is a powder mainly composed of anhydrous gypsum, dihydrate gypsum, or hemihydrate gypsum. What has gypsum as a main component is preferable. Gypsum reacts with the aluminate phase in the cement to produce ettringite (3CaO.Al ₂ O ₃ .3CaSO ₄ .32H ₂ O), thereby suppressing the shrinkage of the grout hardened body and reducing the initial strength. Can be increased. The fineness of gypsum to be used is preferably 3000 cm ² / g or more in terms of the specific surface area by the Blaine method because reaction activity can be obtained. More preferably, gypsum having a fineness of 5000 cm ² / g or more is preferable. The upper limit of the fineness is not particularly limited, but about 15000 cm ² / g is appropriate for the cost of increasing the fineness because the effect is reduced.

  In the early-strength ultrahigh-strength grout composition of the present invention, the content of gypsum is 4 to 12 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. If it is less than 4 parts by mass, the self-shrinkage increases and the strength is insufficient. When it exceeds 12 parts by mass, it becomes difficult to obtain fluidity, and when the amount of water or water reducing agent is increased in order to ensure fluidity as a grout, the strength is insufficient. Since the strength is high and good fluidity is obtained, the gypsum content may be 5 to 10 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. Preferably, it is 6.5 to 8.5 parts by mass.

The fine aggregate used for this invention is not specifically limited, For example, river sand, land sand, sea sand, crushed sand, quartz sand, river gravel, land gravel, crushed stone, artificial aggregate, slag aggregate, etc. can be used. A fine aggregate with a density of less than 3.0 g / cm ³ is preferable because of excellent material non-separability and pumpability, and more preferably a fine aggregate with a density of less than 3.0 g / cm ³ It is preferable to use silica sand having a single particle size and a small aggregate particle size variation and high compressive strength.

  The fine aggregate used for the early-strength ultrahigh-strength grout composition of the present invention contains 40 to 70 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. If the amount is less than 40 parts by mass, the amount of binder increases, and it becomes difficult to obtain fluidity. If the amount of water or water reducing agent is increased in order to ensure fluidity as a grout, the strength is insufficient. When it exceeds 70 mass parts, compressive strength will become low. A more preferable content of the fine aggregate is 45 to 70 parts by mass with respect to 100 parts by mass of the binder.

  In the fine aggregate used in the present invention, the proportion of particles exceeding 2.5 mm is 25% by mass or less, the particles having a size of 0.15 mm or less are 15% by mass or less, and the particles having a size exceeding 0.3 mm and 2.5 mm or less are 70% by mass. The thing which consists of the above particle size can be used, and 1 type chosen from said fine aggregate or 2 types or more can be mixed and contained. If the proportion of particles exceeding 2.5 mm exceeds 25% by mass, the texture of the kneaded grout is impaired, resulting in problems in material separation and pumpability. When the particle size of 0.15 mm or less exceeds 15% by mass, or the particle size of more than 0.3 mm and less than 2.5 mm is less than 70% by mass, kneading with a grout mixer or the like becomes difficult and the kneaded grout The initial fluidity of the liquid drops, and the fluidity cannot be secured. From the viewpoint of the balance of grout kneadability, fluidity, and compressive strength, it is more preferable that the fine aggregate particles having a particle size of more than 0.3 mm and less than 2.5 mm are 90% by mass or more. Further, from the same viewpoint, the proportion of particles exceeding 2.5 mm is preferably 20% by mass or less, and the particles having 0.15 mm or less is more preferably 10% by mass or less.

  The water-reducing agent used in the early-strength ultrahigh-strength grout composition of the present invention is not particularly limited, and examples thereof include polycarboxylate-based water reducing agents, naphthalene sulfonate-based water reducing agents, melamine sulfonate-based water reducing agents, and lignin. A sulfonate type water reducing agent is mentioned, These 1 type (s) or 2 or more types can be used. As the water reducing agent to be used, it is preferable to use a high performance water reducing agent or a high performance AE water reducing agent because it is easy to make the grout ultra high strength with a small addition amount. A polycarboxylate-based high-performance water reducing agent or a polycarboxylate-based high-performance AE water reducing agent is particularly preferable because it can increase the fluidity retention time with a small amount.

  The content of the water reducing agent in the early-strength ultrahigh-strength grout composition of the present invention is 0.15 to 1.80 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. And If it is less than 0.15, the water reducing effect cannot be obtained, and it is difficult to knead the grout easily and the fluidity is insufficient. If it exceeds 1.80 parts by mass, the texture of the mixed grout will be remarkably impaired, resulting in problems in material separation and pumpability. A more preferable content of the water reducing agent is 0.2 to 1.5 parts by mass with respect to 100 parts by mass of the binder.

  As the thickener used in the early-strength ultrahigh-strength grout composition of the present invention, a cellulose thickener, an acrylic thickener, a guar gum thickener, and the like can be used, and a cellulose thickener is preferable. Preferred examples include carboxymethylcellulose, methylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, and hydroxypropylcellulose.

  The thickener used in the early-strength ultrahigh-strength grout composition of the present invention is 0.005 to 0.12 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum. Contain. If it is less than 0.005 parts by mass, material separation occurs in the grout, resulting in insufficient strength. If it exceeds 0.12 parts by mass, the grout is difficult to knead and the fluidity is insufficient. Since it is excellent in material non-separability and excellent in fluidity, the content of the thickening agent is 0.01 to 0.00 with respect to 100 parts by mass of the binder including cement, amorphous aluminosilicate mineral powder and gypsum. The amount is preferably 10 parts by mass, and more preferably 0.02 to 0.08 parts by mass.

  As the thickener used in the early-strength ultrahigh-strength grout composition of the present invention, it is preferable to use water-soluble cellulose in which the viscosity of a 2% by mass aqueous solution at 20 ° C. is 100 to 1500 mPa · s. By using the low-viscosity thickener, the grout kneadability is improved, and the fluidity and compressive strength expression of the present invention can be secured while suppressing material separation.

  An antifoaming agent is preferably used in the early-strength ultrahigh-strength grout composition of the present invention. Although it does not specifically limit as an antifoamer, For example, a polyoxyethylene alkyl ether type | system | group, a pluronic type compound, etc. are mentioned. The amount to be used is preferably 0.03 to 0.2 parts by mass with respect to 100 parts by mass of the binder containing cement, amorphous aluminosilicate mineral powder and gypsum because the compressive strength can be increased. Further, by setting the content of the antifoaming agent within this range, a sufficient antifoaming effect can be obtained, and the entrapped air generated during the grout kneading and the entrending air of the water reducing agent can be removed.

  The early-strength ultrahigh-strength grout composition of the present invention is selected from other admixtures besides cement and amorphous aluminosilicate mineral powder, gypsum, thickener, aggregate, water reducing agent, and antifoaming agent. One type or two or more types can be used in combination as long as the effects of the present invention are not substantially impaired. Examples of such admixtures include foaming agents, expansion materials, cement polymers, waterproofing materials, rust preventives, shrinkage reducing agents, water retention agents, pigments, fibers, water repellents, whitening prevention agents, and quick setting agents (materials). , Rapid hardening agent (material), setting retarder, blast furnace slag fine powder, stone powder, silica fume, volcanic ash, air entraining agent, surface hardener and the like.

  The grout obtained by mixing the early-strength ultrahigh-strength grout composition of the present invention with water preferably imparts no-shrinkage in order to be integrated with a member such as a structure, such as metal aluminum powder. By adding an appropriate amount of the foaming agent, non-shrinkage can be easily exhibited. When adding a foaming agent, it is preferable to set it as 0.0001-0.002 mass% with respect to the mass of a grout composition.

  In addition, the admixture used in the present invention can be used in the form of powder or aqueous solution, but it does not require a complicated measuring operation etc. at the construction site, and it is just necessary to measure and knead a predetermined amount of water. Since the workability at the construction site is better if it is a so-called `` premix product '' in which all of the compounding components of the early strength ultra-high strength grout composition of the present invention are pre-mixed and powdered, It is preferable that all the admixtures used are also in the form of powder or granules.

  Further, the early strength ultrahigh strength grout composition of the present invention is preferably obtained by kneading the above early strength ultrahigh strength grout composition and water in an amount of 20% to 30%. . Among these, from the viewpoint of early strength and ultrahigh strength development, what knead | mixed with the quantity of water used as the water binder ratio 20% or more and less than 26% is more preferable. The method of kneading is not particularly limited, for example, a method of adding and kneading all of the above-mentioned ultra-high strength grout composition in water, a method of kneading and adding the ultra-high strength grout composition to water while kneading, A method of kneading all the water in the ultra high strength grout composition, a method of adding water to the ultra high strength grout composition while kneading and further kneading, water and the ultra high strength grout composition. A method of further kneading the kneaded parts divided into two or more parts, a method of kneading the total amount of the ultra-high-strength grout composition to a combination of water and aqueous admixture, and mixing water and aqueous A method of adding and kneading the ultra-high strength grout composition to a combination of the materials while kneading, and a method of adding and kneading the total amount of water and an aqueous admixture to the ultra-high strength grout composition And the like. An apparatus and a kneading apparatus used for kneading are not particularly limited, but it is preferable to use a mixer because a large amount can be kneaded. Mixers that can be used may be continuous mixers or batch mixers, such as forced biaxial concrete mixers, pan-type concrete mixers, pug mill-type concrete mixers, gravity concrete mixers, grout mixers, hand mixers, plastering mixers, etc. Can be mentioned. Among them, a general grout mixer of the type in which a stirring blade is disposed at the bottom of the mixed layer and the stirring blade is rotated at a high speed to knead the grout composition with water is preferable because it can be easily kneaded in a short time.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[Example 1]
Using the materials shown below, grout compositions of 6 kg each level were prepared at the blending ratios shown in Table 1. The production method of the grout composition is to put each material in the ratio shown in Table 2 in an amount such that the mass of the grout composition to be produced is 6 kg into a plastic bag (length 650 mm × width 350 mm × thickness 0.1 mm), After sealing, the grout composition was produced by shaking by hand for 60 seconds and mixing each material. The prepared grout composition is added with water in an amount corresponding to the water binder ratio shown in Table 1, and is kneaded for 120 seconds in a metal container using a hand mixer (1100 rpm) with a blade diameter of 100 mm. A grout was prepared. Grouts were produced in a constant temperature room at 20 ± 3 ° C. and a humidity of 60% or more.
As a quality test of the prepared grout, as shown below, flow values immediately after kneading and 60 minutes after kneading, kneadability with a hand mixer at the time of kneading, grout inseparability immediately after kneading, age 7 days, The compression strength on the 28th was confirmed. These results are shown in Table 2. All quality tests were conducted in a constant temperature room at 20 ± 3 ° C.

<Quality test method>
-Fluidity test JIS R 5201-1997 "Cement physical test method" 11. According to the flow test, the flow value was measured without performing the drop motion. At this time, the test was performed on an acrylic plate (50 cm × 50 cm × 1 cm) placed on a flow table. The measurement after 60 minutes was performed after stirring for 10 seconds with the hand mixer.

・ Hand mixer kneadability After the material is put into a metal container containing a predetermined amount of water, the kneading does not occur due to overloading during kneading, leaving the kneading in 120 seconds (the kneading ball (the grout composition powder contains a small amount of water). ), Which has been kneaded into a uniform grout, and the motor turns over due to overload during kneading, and kneading takes place for 120 seconds. Leftovers (kneaded balls, etc.) were generated, and those that were additionally kneaded to eliminate kneading were marked as Δ, and those that were difficult to knead and could not be kneaded in 120 seconds were marked as x.

・ Confirmation of inseparability (confirmation of aggregate sedimentation)
The prepared grout was put into a 2 liter poly beaker and allowed to stand for 30 minutes, and then it was judged by touching whether or not fine aggregates were accumulated at the bottom of the poly beaker. “Material separation (separation)” means that fine aggregate settles and accumulates at the bottom of a poly beaker.
The material with no aggregate accumulated was defined as “good”.

-Compressive strength test Compressive strength of each material age was measured according to JSCE-G 505-1999 "Method for testing compressive strength of mortar or cement paste using cylindrical specimen". At this time, the specimen was demolded at the age of 1 day, and then cured in water at 20 ° C. until just before the test.

<Materials used>
Cement HC: Early strong Portland cement (commercial product manufactured by Taiheiyo Cement) (symbol: HC)
Cement NC: Ordinary Portland cement (commercial product manufactured by Taiheiyo Cement) (symbol: NC)
Aluminosilicate mineral powder AS1: Metakaolin commercial product manufactured by BASF Japan (amorphous), Blaine specific surface area 31060 g / cm ² , SiO ₂ component 55%, Al ₂ O ₃ component 43% (symbol: AS1)
Type II anhydrous gypsum G: Blaine specific surface area: 7100 g / cm ² , manufactured by Taiheiyo Materials Co., Ltd. (symbol: G)
Water reducing agent AD: polycanlubonate-based high-performance water reducing agent (commercially available from Kao Corporation) (symbol: AD)
Thickener MC: Water-soluble cellulose, commercially available from Shin-Etsu Chemical Co., Ltd., viscosity of 2% by weight aqueous solution at 20 ° C. is 300 mPa · s (symbol: MC)
Defoamer: Sannopco commercial product (symbol: AF)
Fine aggregate S1: A density of 2.60 g / cm ³ , a combination of commercially available silica sand (No. 2, No. 3, No. 4, No. 5 silica sand) combined, 7% by mass of particles exceeding 2.5 mm, 0 . Aggregate particles adjusted to 2% by mass of particles of 15 mm or less and 92% by mass of particles of 0.3 to 2.5 mm (symbol: S1)

The grout compositions corresponding to the examples of the present invention have a flow property that is sufficiently high as a grout with a flow value of 300 mm or more immediately after kneading and 290 mm or more after 60 minutes. Since it has material inseparability, it can be understood that pumping with a grout pump is possible and workability is excellent. Further, it was confirmed that the kneadability by the hand mixer was good and that the kneading can be easily carried out by a general mixer used for kneading cement-type grout materials. The compressive strength, which is a curable property, was 120 N / mm ² or more at a short-term age of 7 days, and had an early strength and an ultra-high strength.

Comparative Example 1-1 exceeding 85 parts by mass of cement is difficult to knead, and less than 65 parts by mass of cement with respect to 100 parts by mass of the binder, which is a reference product, including cement, amorphous aluminosilicate mineral powder and gypsum. 1-2, Comparative Example 1-3 in which fine aggregate was 81.8 parts by mass, Comparative Example 1-4 in which gypsum was 15.3 parts by mass and 3.8 parts by mass, and Comparative Example 1-5 were The compressive strength at a short age of 7 days was less than 105 N / mm ² .

[Example 2]
Except for the amorphous aluminosilicate mineral powder shown below, each level 6 kg grout composition shown in Table 3 was prepared using the same materials used in Example 1, and the quality test was conducted in the same manner as in Example 1. The results are shown in Table 4.

<Materials used>
Aluminosilicate mineral powder AS2: Commercially available kaolinite is fired at 750 ° C. in a small internal heat kiln. What was pulverized to a specific surface area of Blaine of 23030 g / cm ² . No peak is observed by measurement with a powder X-ray diffractometer. SiO ₂ component 52%, Al ₂ O ₃ component 41% (amorphous) (symbol: AS2)
Aluminosilicate mineral powder AS3: a commercially available kaolinite fired at 1300 ° C. in a small internal heat kiln and ground to a brain specific surface area of 23600 g / cm ² . SiO ₂ component 52%, Al ₂ O ₃ component 41%. A peak was observed by measurement with a powder X-ray diffractometer and identified as mullite. (Crystalline) (Symbol: AS3)
Aluminosilicate mineral powder AS4: A commercially available pyrophyllite, a commercially available band shale, and a commercially available silica powder, which are fired at 760 ° C. in a small internal heat kiln and pulverized to a specific surface area of 27680 g / cm ² . No peak is observed by measurement with a powder X-ray diffractometer. SiO ₂ component 58%, Al ₂ O ₃ component 40% (amorphous) (symbol: AS4)

The grout compositions corresponding to the examples of the present invention have a flow value of 300 mm or more immediately after kneading and 280 mm or more after 60 minutes in fresh properties, and have a sufficiently high fluidity as a grout. Since it has non-separability, it can be understood that pumping with a grout pump is possible and workability is excellent. Further, it was confirmed that the kneadability by the hand mixer was good and that the kneading can be easily carried out by a general mixer used for kneading cement-type grout materials. As for the compressive strength, all were 125 N / mm ² or more at a short-term material age of 7 days, and were early strength and ultrahigh strength.

On the other hand, with respect to Comparative Example 2-1, which uses a crystalline aluminosilicate mineral powder, 100 parts by mass of a binder containing cement, amorphous aluminosilicate mineral powder and gypsum, amorphous aluminosilicate mineral powder is 6. Comparative Example 2-3 with 3 parts by mass, Comparative Example 2-4 and Comparative Example 2-5 with 2.01 parts by mass and 0.08 parts by mass of water reducing agent are all used in a short-term material age of 7 days. The compressive strength was less than 105 N / mm ² .

[Example 3]
Except for the fine aggregates shown below, the same materials used in Example 1 were used to produce 6 kg of grout compositions at each level shown in Table 5, and a quality test was conducted in the same manner as in Example 1. The results are shown in Table 6.

<Materials used>
Fine aggregate S2: a density of 2.60 g / cm ³ , a combination of sieving commercially available silica sand (No. 2, No. 3, No. 4, No. 5), 1% by mass of particles exceeding 2.5 mm, and 0.02%. Aggregate particles adjusted to 1% by mass of particles of 15 mm or less and 97% by mass of particles of 0.3 to 2.5 mm. (Symbol; S2)
Fine aggregate S3: a density of 2.60 g / cm ³ , a combination of commercially available silica sands (No. 2, No. 3, No. 4, No. 5) combined, 27% by mass of particles exceeding 2.5 mm, and Aggregate particles adjusted to 1% by mass of 15 mm particles and 71% by mass of 0.3 to 2.5 mm particles. (Symbol; S3)
Fine aggregate S4: a density of 2.60 g / cm ³ , a combination of sieving commercially available silica sand (No. 2, No. 3, No. 4, No. 5), combined with 1% by mass of particles exceeding 2.5 mm, 0.00%. Aggregate particles adjusted to 16% by mass of particles of 15 mm or less and 81% by mass of particles of 0.3 to 2.5 mm. (Symbol; S4)
Fine aggregate S5: a density of 2.60 g / cm ³ , a combination of commercially available silica sands (No. 2, No. 3, No. 4, No. 5) and a combination of 16% by mass of particles exceeding 2.5 mm, and 0.0. Aggregate particles adjusted to 9% by mass of particles of 15 mm or less and 67% by mass of particles of 0.3 to 2.5 mm. (Symbol: S5)

The grout compositions according to the examples of the present invention each have a flow property of 285 mm or more immediately after kneading and 280 mm or more after 60 minutes in the fresh properties, and have a sufficiently high fluidity as a grout. It can be seen that it is separable and has excellent workability. Further, it was confirmed that the kneadability by the hand mixer was good and that the kneading can be easily carried out by a general mixer used for kneading cement-type grout materials. As for the compressive strength, all were 120 N / mm ² or more at a short-term age of 7 days, which was early strength and very high strength.

Comparative Example 3-3 in which fine aggregate particles exceeding 2.5 mm were adjusted to 27 mass%, and Comparative Example 3-5 in which fine aggregate particles of 0.3 to 2.5 mm were adjusted to 67 mass%, In all cases, the compressive strength at a short age of 7 days was less than 105 N / mm ² . Further, Comparative Example 3-4 in which particles of fine aggregate of 0.15 mm or less were adjusted to 16% by mass was difficult to knead with a hand mixer and could not be molded into a test piece.

[Example 4]
0.0004 parts by mass of a foaming agent is blended with a grout composition (Invention product 1 and Invention product 7, Invention product 9), which is considered to be more preferable in the present invention product, and mixed with a Henschel mixer to each level of 125 kg ( A grout composition shown in Table 7 of 25 kg / bag × 5 bags) was produced. The prepared grout composition is a 150 liter grout mixer (manufactured by Okasan Kiko Co., Ltd., mixer equipped with a stirring blade at the bottom of the kneading tank, rotation speed: 1000 rpm), and after 125 kg (5 bags) are continuously charged, 90 seconds. Kneaded. In addition to the same quality test as in Example 1, the kneaded grout was measured for initial expansion rate and confirmed non-shrinkage. The initial expansion coefficient was measured in accordance with JSCE-F 542-1999 “Bleeding rate and expansion coefficient test method of filling mortar”, and the initial expansion coefficient of material 1 day and material 7 days was measured. The results are shown in Table 8.

<Materials used>
Foaming agent F: Aluminum powder (commercially available from Toyo Aluminum)

The grout compositions according to the examples of the present invention have fresh properties even when a foaming agent is mixed, and the flow value is 300 mm or more immediately after kneading, and 300 mm or more after 60 minutes. It can be seen that it also has material inseparability. In addition, the grout compositions according to the examples of the present invention can be kneaded into a uniform grout without kneading by kneading for 90 seconds with a grout mixer without overloading the motor due to overload during kneading, and the kneadability is good. there were. In terms of compressive strength, in both short-term ages of 7 days, the strength was 135 N / mm ² or more, which was early strength and ultrahigh strength. Moreover, the initial expansion rate of material age 1 day and material age 7 was a positive value at +0.3 to + 0.4%, and good no-shrinkage was confirmed.

  Furthermore, after kneading by the grout mixer, 62 liters of each grout of the product of the present invention discharged from the grout mixer to the hopper was pumped to confirm the pumpability. Using a grout pump (Okasan Kiko Co., Ltd.) connected with a pressure hose for grout (Okasan Kiko Co., Ltd.), the fluidity and material inseparability of the grout discharged from the hose tube tip were confirmed after pumping through the 10 m hose. As a result, it was confirmed that the same quality as the fresh property (flow value and material non-separability) before 10 m pumping was confirmed, pumping with a grout pump was sufficiently possible, and the workability was excellent.

According to the present invention, an ultra-high strength grout with high fluidity and high strength can be obtained. Therefore, it can be suitably used for joining portions of each member of an ultra-high-rise building, filling inside an ultra-high strength member, and the like. it can. In construction work for high-strength building structures, etc., grout mixed with a grout mixer that has a stirring blade at the bottom of a general mixing layer and rotates the stirring blade at high speed is easily pumped with a grout pump. Since compressive strength of 120 N / mm ² or more can be obtained at a material age of 7 days, there is an advantage that the construction period and the work efficiency in the above construction can be shortened.

Claims (5)

Cement, amorphous aluminosilicate mineral powder, gypsum, water reducing agent, thickener and fine aggregate, and cement 100 to 70 parts by mass of cement, amorphous aluminosilicate mineral powder and gypsum 90 parts by mass, amorphous aluminosilicate mineral powder 8-18 parts by mass, gypsum 4-12 parts by mass, fine aggregate 40-70 parts by mass, water reducing agent 0.15-1.80 parts by mass, thickener 0. 005 to 0.12 parts by mass,
In the fine aggregate, the proportion of particles exceeding 2.5 mm is 25% by mass or less, the particles of 0.15 mm or less are 15% by mass or less, and the particles exceeding 0.3 mm and 2.5 mm or less are 70% by mass or more. An early strength ultra high strength grout composition.   The early-strength ultrahigh-strength grout composition according to claim 1, wherein the fine aggregate has a particle size of not less than 0.3 mm and not more than 2.5 mm of 90% by mass or more.   The early-strength ultrahigh-strength grout composition according to claim 1 or 2, which is used at a water binder ratio of 20 to 30%.   The early-strength ultrahigh-strength grout composition according to any one of claims 1 to 3, wherein the thickener is water-soluble cellulose having a viscosity of 100 to 1500 mPa · s at 2% by mass at 20 ° C.   Furthermore, 0.03-0.2 mass part of antifoamers are contained with respect to 100 mass parts of binders containing cement, amorphous aluminosilicate mineral powder, and gypsum. An early strength ultra high strength grout composition.