GB2048330A - Method of preparing a fibre- reinforced cementitious plate - Google Patents
Method of preparing a fibre- reinforced cementitious plate Download PDFInfo
- Publication number
- GB2048330A GB2048330A GB8013768A GB8013768A GB2048330A GB 2048330 A GB2048330 A GB 2048330A GB 8013768 A GB8013768 A GB 8013768A GB 8013768 A GB8013768 A GB 8013768A GB 2048330 A GB2048330 A GB 2048330A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibres
- cement
- slurry
- fibre
- preparing
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010419 fine particle Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 5
- 239000011707 mineral Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000011159 matrix material Substances 0.000 claims abstract description 3
- 239000000047 product Substances 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 claims description 2
- 108010007387 therin Proteins 0.000 claims 1
- 244000025254 Cannabis sativa Species 0.000 description 6
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 6
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 6
- 239000010425 asbestos Substances 0.000 description 6
- 235000009120 camo Nutrition 0.000 description 6
- 235000005607 chanvre indien Nutrition 0.000 description 6
- 239000011487 hemp Substances 0.000 description 6
- 229910052895 riebeckite Inorganic materials 0.000 description 6
- 244000166124 Eucalyptus globulus Species 0.000 description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- 235000011148 calcium chloride Nutrition 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Producing Shaped Articles From Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Laminated Bodies (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Artificial Filaments (AREA)
- Glass Compositions (AREA)
Abstract
Method of preparing a fibre- reinforced plate comprising a cementitious matrix having uniformly distributed therein synthetic mineral fibres, natural organic fibres or mixtures thereof, fibres and a fine material having an average particle size lower than that of the cement particles, removing excess water therefrom to form a moist sheet, combining several moist sheets to form a multilayered product and allowing said product to harden to form a plate. The presence of fine particles in the slurry prevents fine cement particles from being removed together with excess water and a plate product having improved strength is obtained.
Description
SPECIFICATION
Method of preparing a fibre-reinforced cementitious plate
This invention relates to a method of preparing a fibre-reinforced plate comprising a cementitious matrix having uniformly distributed therein fibres selected from a group consisting of synthetic mineral fibres, natural organic fibres and mixtures thereof, comprising the steps of applying to a filter cloth a layer of an aqueous slurry of cement and fibres, removing excess water therefrom to form a moist sheet, combining several moist sheets to form a multilayered product and allowing said product to harden to form a plate.
Recently it has been proposed to use mixtures of synthetic mineral fibres, such as rock wool fibres, and natural organic fibres, such as cellulosic fibres, instead of asbestos fibres in conventional cementitious products reinforced with asbestos fibres.
Conventional cementitious products reinforced with asbestos fibres are prepared by applying an aqueous slurry of asbestos fibres and a cement, such as Portland cement, onto a filter cloth and subsequently removing excess water by suction and pressing so as to form a moist sheet. Several moist sheets prepared in this manner are subsequently applied to the surface of a cylindrical drum to form a multilayered coating thereon. The coating thus formed is then cut along a line extending parallel to the axis of the cylindrical drum to form a multilayered sheet. The sheet is subsequently removed from the cylindrical drum and transferred to a support on which it is stored while it is hardening.
When using rock wool fibres and/or cellulosic fibres instead of asbestos fibres in the above mentioned conventional method of preparing fibre-reinforced cementitious plates, part of the cement particles passes through the filter cloth together with excess water which is removed by suction or pressing. The cement particles removed are mainly the fine particles initially present in those portions of the moist sheet which are in contact with the filter cloth. Due to the removal of these fine particles from these zones, the distribution of cement particles becomes non-uniform and the rate of hardening is reduced in these zones.
The object of the invention is to eliminate these drawbacks.
According to the invention there is provided a method wherein a fine material having an average particle size lower than that of the cement particles is incorporated into the aqueous slurry of cement and fibres.
Surprisingly it has been found that the presence of the fine particles significantly reduces the loss of fine cement particles together with excess water. Thus, a uniform distribution of fine cement particles in the multilayered product and a satisfactory hardening are achieved. As a result thereof a plate product having an improved strength can be produced.
The fine particles are preferably filter dust particles produced as a byproduct in the manufacture of silicon or silicon alloys by an electrothermal process. Such filter dust ordinarily contains from 80 to 95% amorphous silica having a particle size mainly falling within the range of from 0.5 to 50 ym. Such silica particles are particularly preferred because they tend to neutralize alkaline products present in the mixture of cement and water, thus inhibiting alkaline degradation of the mineral fibres.
Since high concentrations of fine particles in the slurry of cement and fibres reduce the rate at which excess water is removed from the slurry, the amount of fine particles should preferably not exceed 1 5% by weight based on the weight of the cement.
The effect of the fine particles may be increased by adding to the slurry a small amount, e.g. 0.1% by weight, based on the weight of the cement of a thickening agent. A preferred thickening agent is a product which is commercially available under the trake name "Polyox". The thickening agent may reduce the hardening rate and therefore it may be desirable to use a combination of thickening agent and hardening accelerator, such as calcium chloride.
The invention will be illustrated in further detail with reference to the following example:
EXAMPLE
Samples of fibre-reinforced cementitious products comprising different natural organic fibres and varying amounts of fibres, thickening agent and hardening accelerator as well as filter dust were prepared by a conventional process for use in the manufacture of socalled asbestos cement products.
The samples were prepared from mixtures having the composition set forth in the following table. The table also sets forth the bending strength and density of the samples obtained.
The dry matter concentration of all slurries was 6.6% by weight.
TABLE
Portland Rock Wool Cellulosic Thickening CaCl2 Bending
Sample Cement, Fibres, Fibres, Filter Dust Agent, *) **) Strength Density
No. % by weight % by weight % by weight % by weight gg/l kg/cm2 g/cm3 1 76.5 9.5 Eucalyptus 5 9 0.05 1 186 1.59 2 77.5 8.5 Hemp 5 9 0.05 2 231 1.51 3 77.5 8.5 Eucalyptus 5 9 0.1 2 195 1.56 4 80.5 5.5 Hemp 5 9 0.1 1 246 1.55 5 77.5 8.5 Hemp 5 9 0.05 1 245 1.58 6 80.5 5.5 Hemp 6 9 0.1 2 223 1.53 7 77.5 8.5 Eucalyptus 5 9 0.1 1 210 1.60 8 80.5 5.5 Ducalyptus 6 9 0.05 1 245 1.53 9 80.5 5.5 Eucalyptus 5 9 0.05 2 202 1.61 10 88.6 8.5 Hemp 5 - 0.06 1 192 1.58 11 89.5 5.5 Hemp 5 - 0.05 1 218 1.51 *) Polyethylene oxide ("Polyox").
**) The concentration of CaCl2 is grams per litre water contained in the slurry.
As will appear from the table, the bending strength of the samples containing no filter dust (samples Nos. 10 and 1 1 ) is much lower than that of the samples containing similar amounts of fibres (samples Nos. 5 and 4, respectively).
Claims (6)
1. A method of preparing a fibre-reinforced plate comprising a cementitious matrix having uniformly distributed therin fibres selected from the group consisting of synthetic mineral fibres, natural organic fibres and mixtures thereof, comprising the steps of applying to a filter cloth a layer of an aqueous slurry of cement and fibres, removing excess water therefrom to form a moist sheet, combining several moist sheets to form a multilayered product and allowing said product to harden to form a plate, characterized in incorporating into said slurry a fine material having an average particle size lower than that of the cement particles.
2. A method as in claim 1, characterized in that the fine material is filter dust obtained as a byproduct in the manufacture of silicon or silicon ailoys by an electrothermal process.
3. A method as in claim 1, characterized in that the amount of fine particles does not exceed 15% by weight of the cement.
4. A method as in claim 1, characterized in further incorporating into said slurry a thickening agent.
5. A method as in claim 3, characterized in further incorporating into said slurry a hardening accelerator.
6. A method of preparing a fibre-reinforced plate substantially as hereinbefore described with reference to the foregoing example.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK171879A DK171879A (en) | 1979-04-26 | 1979-04-26 | PROCEDURE FOR MANUFACTURING FIBER ARMED CEMENT PLATES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2048330A true GB2048330A (en) | 1980-12-10 |
| GB2048330B GB2048330B (en) | 1983-04-27 |
Family
ID=8107490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8013768A Expired GB2048330B (en) | 1979-04-26 | 1980-04-25 | Method of preparing a fibre-reinforced cementitious plate |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS55144466A (en) |
| BE (1) | BE882948A (en) |
| DE (1) | DE3015734A1 (en) |
| DK (1) | DK171879A (en) |
| ES (1) | ES490918A0 (en) |
| FI (1) | FI801335A7 (en) |
| FR (1) | FR2455014A1 (en) |
| GB (1) | GB2048330B (en) |
| IT (1) | IT8021630A0 (en) |
| LU (1) | LU82397A1 (en) |
| NL (1) | NL8002354A (en) |
| NO (1) | NO801207L (en) |
| SE (1) | SE8003096L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0068742A1 (en) * | 1981-06-19 | 1983-01-05 | CAPE BOARDS & PANELS LIMITED | Shaped articles |
| EP0225932A1 (en) * | 1985-12-13 | 1987-06-24 | Kuraray Co., Ltd. | Asbestos-free, hydraulic inorganic material-based sheet products and process for their production |
| FR2722813A1 (en) * | 1994-07-21 | 1996-01-26 | Norpac | Concrete slabs |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT1374U1 (en) * | 1996-10-09 | 1997-04-25 | Karl F Stroeml | BIOFIBER CONCRETE |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO763003L (en) * | 1975-09-19 | 1977-03-22 | Heinz Hoelter | FILLER FOR BUILDING MASSES, PAINTS AND THE LIKE. |
| IE45447B1 (en) * | 1976-07-30 | 1982-08-25 | Pilkington Brothers Ltd | Improvements relating to asbestos-free fibre reinforced cementitious products |
| ZA782268B (en) * | 1977-04-27 | 1979-04-25 | Ici Ltd | Cementitious compositions |
-
1979
- 1979-04-26 DK DK171879A patent/DK171879A/en active IP Right Grant
-
1980
- 1980-04-23 NL NL8002354A patent/NL8002354A/en not_active Application Discontinuation
- 1980-04-24 FR FR8009209A patent/FR2455014A1/en not_active Withdrawn
- 1980-04-24 BE BE0/200347A patent/BE882948A/en unknown
- 1980-04-24 JP JP5528380A patent/JPS55144466A/en active Pending
- 1980-04-24 SE SE8003096A patent/SE8003096L/en not_active Application Discontinuation
- 1980-04-24 IT IT8021630A patent/IT8021630A0/en unknown
- 1980-04-24 DE DE19803015734 patent/DE3015734A1/en not_active Withdrawn
- 1980-04-25 ES ES490918A patent/ES490918A0/en active Granted
- 1980-04-25 NO NO801207A patent/NO801207L/en unknown
- 1980-04-25 FI FI801335A patent/FI801335A7/en not_active Application Discontinuation
- 1980-04-25 LU LU82397A patent/LU82397A1/en unknown
- 1980-04-25 GB GB8013768A patent/GB2048330B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0068742A1 (en) * | 1981-06-19 | 1983-01-05 | CAPE BOARDS & PANELS LIMITED | Shaped articles |
| EP0225932A1 (en) * | 1985-12-13 | 1987-06-24 | Kuraray Co., Ltd. | Asbestos-free, hydraulic inorganic material-based sheet products and process for their production |
| FR2722813A1 (en) * | 1994-07-21 | 1996-01-26 | Norpac | Concrete slabs |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2455014A1 (en) | 1980-11-21 |
| GB2048330B (en) | 1983-04-27 |
| SE8003096L (en) | 1980-10-27 |
| ES8106441A1 (en) | 1981-08-16 |
| JPS55144466A (en) | 1980-11-11 |
| IT8021630A0 (en) | 1980-04-24 |
| DE3015734A1 (en) | 1980-11-06 |
| FI801335A7 (en) | 1980-10-27 |
| LU82397A1 (en) | 1980-07-31 |
| BE882948A (en) | 1980-08-18 |
| NO801207L (en) | 1980-10-27 |
| NL8002354A (en) | 1980-10-28 |
| ES490918A0 (en) | 1981-08-16 |
| DK171879A (en) | 1980-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |