CN114835453B - Glass fiber concrete and prefabricated product - Google Patents
Glass fiber concrete and prefabricated product Download PDFInfo
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- CN114835453B CN114835453B CN202210524082.4A CN202210524082A CN114835453B CN 114835453 B CN114835453 B CN 114835453B CN 202210524082 A CN202210524082 A CN 202210524082A CN 114835453 B CN114835453 B CN 114835453B
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- glass fiber
- fiber concrete
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- triethoxysilane
- flow aid
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Classifications
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- 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
- C04B28/04—Portland cements
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- 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
Abstract
The application relates to the technical field of building materials, and particularly discloses glass fiber concrete and a prefabricated product. The glass fiber concrete comprises, by weight, 20-40 parts of cement, 1-5 parts of alkali-resistant glass fibers, 40-50 parts of quartz sand, 5-10 parts of fly ash, 0.4-0.8 part of a water reducer and 0.5-1.2 parts of a flow aid; wherein the water-cement ratio is 0.35-0.37. The glass fiber concrete improves the fluidity and strength of the glass fiber concrete through the interaction of the water reducing agent and the flow aid, the slump of the glass fiber concrete is more than 236mm, the expansion degree is more than 588mm, the compressive strength is more than 52.2MPa, and the tensile strength is more than 6.8 MPa.
Description
Technical Field
The application relates to the technical field of building materials, in particular to glass fiber concrete and a prefabricated product.
Background
Glass fiber concrete, GRC (Glass Fiber Reinforced Concrete) for short, is a cement-based composite material formed by embedding alkali-resistant glass fibers into a cement-based material. Because glass fiber concrete has good durability, chemical resistance, non-combustibility and good sound insulation and heat insulation, it can be molded into various prefabricated products with complex shapes and contours, and is widely used as building facade decorative materials.
In order to make the formability of the preform better, the shape profile is clear and complete, and glass fiber concrete is required to have better fluidity. At present, two main ways of improving the fluidity of glass fiber concrete are: (1) The cement consumption and the sand stone aggregate consumption are unchanged, the cement consumption is increased, the cement paste is thin, the fluidity of the glass fiber concrete is increased, the water retention of the glass fiber concrete is seriously reduced, bleeding is increased, the cohesiveness is reduced, and the strength of the glass fiber concrete is reduced. (2) The air entraining agent is added into the glass fiber concrete to increase fluidity, and simultaneously, the viscosity of the glass fiber concrete is reduced, so that the phenomenon of flow slurry is caused.
Accordingly, there is a need for a glass fiber reinforced concrete with good fluidity and high strength that can ensure the shape profile of the preform to be clear and complete and the strength.
Disclosure of Invention
In order to improve the fluidity of the glass fiber concrete, the shape of the preform is integrated and the strength is not reduced. The application provides a glass fiber concrete and a prefabricated product.
In a first aspect, the application provides glass fiber concrete, which comprises, by weight, 20-40 parts of cement, 1-5 parts of alkali-resistant glass fibers, 40-50 parts of quartz sand, 5-10 parts of fly ash, 0.4-0.8 part of a water reducer and 0.5-1.2 parts of a flow aid;
wherein the water-cement ratio is 0.35-0.37.
Glass fiber concrete is generally prepared from cement, alkali-resistant glass fiber, quartz sand and fly ash, has higher durability and chemical resistance, is often used for preparing prefabricated products with various complex shapes, and is widely used in building facade decorative materials. In the preparation process of the prefabricated product, the glass fiber concrete has poor flowability, so that partial prefabricated product has incomplete shape.
In the application, on the premise that the water cement ratio is 0.35-0.37, the water reducer and the flow aid are added into the glass fiber concrete, so that the fluidity of the glass fiber concrete is improved, the glass fiber concrete has better formability, and the shape integrity of a prefabricated product is ensured. By the mutual cooperation of the water reducing agent and the flow aid, the strength of the glass fiber concrete 28d can be improved while the early-stage fluidity of the glass fiber concrete is improved.
When the water reducing agent and the flow aid are added in the ratio of (0.4-0.8 part)/(0.5-1.2 part), the fluidity of the glass fiber concrete can be improved, the slump is more than 236mm, and the expansion is more than 588 mm.
In one embodiment, the glass fiber concrete comprises 30-40 parts of cement, 3-5 parts of alkali-resistant glass fiber, 45-50 parts of quartz sand, 8-10 parts of fly ash, 0.4-0.6 part of water reducer and 0.5-0.9 part of flow aid.
In one embodiment, the glass fiber concrete comprises 30 parts of cement, 3 parts of alkali-resistant glass fiber, 45 parts of quartz sand, 8 parts of fly ash, 0.6 part of water reducer and 0.9 part of flow aid. Preparing glass fiber concrete according to the raw materials in parts by weight, wherein the slump is more than 245mm, the expansion degree is more than 655mm, the compressive strength is more than 55.5MPa, and the tensile strength is more than 7.6 MPa.
In one embodiment, the flow aid is selected from the group consisting of 1H, 2H-perfluorodecyl triethoxysilane, 1H, 2H-perfluorooctyl triethoxysilane.
In this application, the flow aid may be selected from 1H, 2H-perfluorodecyl triethoxysilane, or 1H, 2H-perfluorooctyl triethoxysilane, or a mixture of 1H, 2H-perfluorodecyl triethoxysilane and 1H, 2H-perfluorooctyl triethoxysilane.
In one embodiment, the weight ratio of the 1H, 2H-perfluorodecyl triethoxysilane to the 1H, 2H-perfluorooctyl triethoxysilane is 1 (1-5).
In one embodiment, the weight ratio of the 1H, 2H-perfluorodecyl triethoxysilane to the 1H, 2H-perfluorooctyl triethoxysilane is 1 (3-5).
In one embodiment, the weight ratio of the 1H, 2H-perfluorodecyl triethoxysilane to the 1H, 2H-perfluorooctyl triethoxysilane is 1:3. When the dosage of the water reducer and the flow aid and other conditions are unchanged, the glass fiber concrete has better fluidity and strength and slump of 262mm by adopting the technical scheme.
In one embodiment, the water reducing agent is a polycarboxylate type water reducing agent.
The reduction of the polycarboxylic acid water reducer is generally about 25%, and is superior to naphthalene water reducers, fatty acid water reducers and the like. And the polycarboxylic acid water reducer has wider mutual adaptability to a matrix material and narrower adaptability to a sand material. In the use process, the water-retaining agent has the advantages of good water-retaining property, cohesiveness, weather adaptability and the like. After the polycarboxylic acid water reducer is matched with the flow aid, the fluidity of the glass fiber concrete can be improved, the shape of a prefabricated product can be ensured to be clear and full, and the defect rate is kept at a lower level. In addition, the strength of the glass fiber concrete can be improved by adding the water reducer and the flow aid, so that the use requirement of the glass fiber concrete in the outer wall of a building is met.
In one embodiment, the alkali resistant glass fiber has a zirconia content of 16.5% or more.
The alkali-resistant glass fiber is a roving. The roving is available from Shaanxi Huate New Material Co., ltd., with a filament diameter of 15. Mu.m. In glass fiber concrete, the length of the roving is 3-10mm, and the lengths of the roving may be the same or different.
In one embodiment, the silica sand has a mud content of less than 1% and a particle size of 1 to 5mm.
In a second aspect, the present application provides a glass fiber concrete preform prepared using the glass fiber concrete described herein.
Firstly, preparing a corresponding mold according to the requirement; then adding cement, alkali-resistant glass fiber, quartz sand, fly ash, a water reducer and a flow aid into a concrete mixer according to corresponding parts, and then adding water to prepare glass fiber concrete, so that the water-cement ratio of the glass fiber concrete is 0.35-0.37. And finally, adding the prepared glass fiber concrete into a mould, and removing the mould after the glass fiber concrete is hardened to prepare a prefabricated product. The preform has complete shape, clear outline and high compressive strength of 52.2MPa or more and high tensile strength of 6.8MPa or more, namely the glass fiber concrete has high compressive strength of 52.2MPa or more and high tensile strength of 6.8MPa or more, through performance detection.
In summary, the present application has the following beneficial effects:
1. on the premise of the water cement ratio of 0.35-0.37, the fluidity and the strength of the glass fiber concrete are improved through the mutual cooperation of the water reducer and the flow aid, the slump of the glass fiber concrete is more than 236mm, the expansibility is more than 588mm, the compressive strength is more than 52.2MPa, and the tensile strength is more than 6.8 MPa;
2. the flow aid in the application is preferably a mixture of 1H, 2H-perfluoro decyl triethoxysilane and 1H, 2H-perfluoro octyl triethoxysilane, the slump of the glass fiber concrete is more than 250mm, and the expansion degree is more than 660 mm; 3. the flow aid is preferably 1:3 of the 1H, 2H-perfluoro decyl triethoxysilane and 1H, 2H-perfluoro octyl triethoxysilane, and has the advantages of better fluidity and strength, slump of 262mm, expansion of 685m, compressive strength of 62.6MPa and tensile strength of 9.3MPa.
Detailed Description
The present application is described in further detail below with reference to examples.
Raw materials
The raw materials used in the present application are all commercially available.
1H, 2H-perfluorodecyl triethoxysilane, CAS number: 101947-16-4;
1H, 2H-perfluorooctyl triethoxysilane, CAS number: 51851-37-7;
the polycarboxylic acid water reducer is purchased from Shandong Xinhongyue chemical industry Co., ltd, and the product number is XHY-006.
Examples
Example 1
30kg of cement, 3kg of alkali-resistant glass fiber, 45kg of quartz sand, 8kg of fly ash, 0.6kg of water reducer and 0.9kg of flow aid are sequentially added into a concrete mixer; mixing and stirring uniformly, and then adding 14kg of water to prepare glass fiber concrete;
wherein the cement is P.O 42.5.42.5 ordinary Portland cement;
wherein the alkali-resistant glass fiber is alkali-resistant roving, the zirconia content is 16.5%, and the length is 5mm;
wherein the mud content of the quartz sand is 0.5 percent, and the grain diameter is 3mm;
wherein the water reducer is a polycarboxylic acid water reducer;
wherein the flow aid is 1H, 2H-perfluorodecyl triethoxysilane.
Example 2-example 11 differs from example 1 as shown in table 1.
TABLE 1 example 2-example 11 differs from example 1 (unit: kg)
* In Table 1, "-" indicates that the flow aid was 1H, 2H-perfluorodecyl triethoxysilane used singly as in example 1, and the flow aid was not contained in the composition.
Comparative example
The differences between comparative examples 1 to 7 and example 1 are shown in Table 2.
Table 2 the differences between comparative examples 1-7 and example 1 (unit: kg)
* In Table 2, "-" indicates that the flow aid of comparative example 1 was 1H, 2H-perfluorodecyl triethoxysilane singly used and contained no proportion.
Performance test
The glass fiber concretes prepared in examples 1 to 11 and comparative examples 1 to 7 were subjected to the fluidity and strength test, and the specific test results are shown in Table 3.
The fluidity of the concrete is evaluated by slump and expansion degree, and the slump and expansion degree test method is carried out according to the method described in GB/T50080-2016 Standard of test method for Performance of common concrete mixtures.
The mechanical properties of glass fiber concrete need to meet the requirements of JC/T940-2004 glass fiber reinforced Cement (GRC) decorative products.
TABLE 3 detection results
It can be seen from the combination of examples 1 to 11 and comparative examples 1 to 7 and the combination of table 3 that the addition of the water reducing agent and the flow aid to the glass fiber concrete can improve the fluidity and strength of the glass fiber concrete by the cooperation of the water reducing agent and the flow aid. The glass fiber concretes prepared in examples 1 to 11 had slump of 236mm or more, expansion of 588mm or more, compressive strength of 52.2MPa or more, and tensile strength of 6.8MPa or more.
It can be seen from the combination of examples 1-3 and comparative examples 2-3 and Table 3 that the slump and expansion of the fiberglass concrete increased and then decreased with increasing amounts of flow aid while the water reducing agent and other conditions were unchanged.
It can be seen from the combination of examples 1, 4, 5 and comparative examples 5 to 6 and the combination of table 3 that the slump and the expansion of the glass fiber concrete are increased and then decreased with the gradual increase of the amount of the water reducing agent when the flow aid and other conditions are not changed.
As can be seen in combination with example 1 and comparative examples 1, 4, 7 and with table 3, when the water reducer is used singly in the glass fiber concrete; or a single use of a flow aid; or the slump and the expansion degree of the glass fiber concrete are smaller when the dosages of the water reducer and the flow aid are zero. The glass fiber concrete improves the fluidity thereof through the mutual cooperation of the water reducing agent and the flow aid.
In combination with examples 1, 6, 7-11 and with Table 3, it can be seen that the choice of flow aid influences the flowability of the glass-fibre concrete when the amounts of water-reducing agent and flow aid are unchanged. The slump and the expansion degree are a mixture of 1H, 2H-perfluoro decyl triethoxysilane and 1H, 2H-perfluoro octyl triethoxysilane in sequence from high to low, 1H, 2H-perfluorooctyl triethoxysilane, 1H, 2H-perfluorodecyl triethoxysilane.
When the flow aid is a mixture of 1H, 2H-perfluorodecyl triethoxysilane and 1H, 2H-perfluorooctyl triethoxysilane, as the amount of 1h,2 h-perfluorooctyl triethoxysilane is gradually increased, the slump and the expansion degree of the glass fiber concrete are increased and then decreased.
When the weight ratio of 1H, 2H-perfluorodecyl triethoxysilane to 1H, 2H-perfluorooctyl triethoxysilane is 1:3, the glass fiber concrete is excellent in fluidity and strength, has a slump of 262mm, an expansion of 685m, a compressive strength of 62.6MPa, and a tensile strength of 9.3MPa.
It is to be understood that the above embodiments are merely illustrative of the exemplary embodiments employed to illustrate the principles of the present application, however, the present application is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the present application, and are also considered to be within the scope of the invention.
Claims (9)
1. The glass fiber concrete combination is characterized by comprising, by weight, 20-40 parts of cement, 1-5 parts of alkali-resistant glass fibers, 40-50 parts of quartz sand, 5-10 parts of fly ash, 0.4-0.8 part of water reducer and 0.5-1.2 parts of flow aid;
wherein the water-cement ratio is 0.35-0.37;
wherein the flow aid is selected from the group consisting of 1H, 2H-perfluorodecyl triethoxysilane, 1H, 2H-perfluorooctyl triethoxysilane.
2. The glass fiber concrete according to claim 1, wherein the glass fiber concrete comprises, by weight, 30-40 parts of cement, 3-5 parts of alkali-resistant glass fiber, 45-50 parts of quartz sand, 8-10 parts of fly ash, 0.4-0.6 part of water reducer and 0.5-0.9 part of flow aid.
3. The glass fiber concrete according to claim 1, wherein the flow aid is a mixture of 1H, 2H-perfluorodecyl triethoxysilane and 1H, 2H-perfluorooctyl triethoxysilane, the weight ratio of the 1H, 2H-perfluoro decyl triethoxysilane to the 1H, 2H-perfluoro octyl triethoxysilane is 1: (1-5).
4. A glass fiber concrete according to claim 3, wherein the weight ratio of the 1h,2 h-perfluorodecyl triethoxysilane to the 1h,2 h-perfluorooctyl triethoxysilane is 1 (3-5).
5. Glass fiber concrete according to claim 1 or 2, characterized in that the water reducing agent is a polycarboxylate type water reducing agent.
6. The glass fiber concrete according to claim 1 or 2, wherein the alkali resistant glass fiber has a zirconia content of 16.5% or more.
7. Glass fiber concrete according to claim 1 or 2, wherein the silica sand has a mud content of less than 1% and a particle size of 1-5mm.
8. Glass fiber concrete according to claim 1 or 2, wherein the slump of the glass fiber concrete is 236mm and the expansion is 602mm.
9. A glass fiber concrete preform prepared from the glass fiber concrete of any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210524082.4A CN114835453B (en) | 2022-05-14 | 2022-05-14 | Glass fiber concrete and prefabricated product |
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| CN202210524082.4A CN114835453B (en) | 2022-05-14 | 2022-05-14 | Glass fiber concrete and prefabricated product |
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| CN114835453A CN114835453A (en) | 2022-08-02 |
| CN114835453B true CN114835453B (en) | 2023-05-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108164230B (en) * | 2018-01-11 | 2021-05-04 | 中国建材检验认证集团北京天誉有限公司 | Glass fiber reinforced cement material prepared from solid-waste mixture |
| CN108069669B (en) * | 2018-01-11 | 2021-05-04 | 中国建材检验认证集团北京天誉有限公司 | Glass fiber reinforced cement material prepared from waste concrete |
| CN108640603A (en) * | 2018-05-29 | 2018-10-12 | 南京国电南自电网自动化有限公司 | A kind of Portland cement base glass fiber reinforced cement material and preparation method thereof |
| CN111559895B (en) * | 2020-06-01 | 2022-04-29 | 中国建材检验认证集团北京天誉有限公司 | Low-water-absorption regenerated GRC material and preparation method thereof |
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