CN108069669B - Glass fiber reinforced cement material prepared from waste concrete - Google Patents
Glass fiber reinforced cement material prepared from waste concrete Download PDFInfo
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- CN108069669B CN108069669B CN201810024893.1A CN201810024893A CN108069669B CN 108069669 B CN108069669 B CN 108069669B CN 201810024893 A CN201810024893 A CN 201810024893A CN 108069669 B CN108069669 B CN 108069669B
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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
- C04B28/06—Aluminous 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
- 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
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a glass fiber reinforced cement material prepared from waste concrete, which comprises the following components: 35-50 parts of cement, 10-50 parts of quartz sand, 5-50 parts of waste concrete particles, 10-20 parts of water, 0.1-2 parts of a water reducing agent, 0.1-1 part of a coagulation regulator, 1-5 parts of a high polymer solution and 3-6 parts of alkali-resistant glass fibers. The cement is quick-hardening sulphoaluminate cement; the fibers are alkali-resistant glass fiber untwisted roving; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the high molecular polymer solution is acrylate copolymer emulsion. The glass fiber reinforced cement material has the characteristics of high bending strength, high impact resistance and high freezing resistance, and is suitable for preparing high-quality assembly type building boards. The invention provides a preparation method of a glass fiber reinforced cement material for preparing a high-quality assembly type building board by using waste concrete.
Description
Technical Field
The invention relates to a cement-based composite material, in particular to a glass fiber reinforced cement material for a high-quality assembly type building board prepared from waste concrete and a preparation method thereof, belonging to the technical field of building materials.
Background
The fabricated building is a building fabricated on the construction site by using prefabricated components, and has the advantages of high construction speed, small restriction by climatic conditions, labor saving and building quality improvement. The fabricated building prepares required components according to the field requirements and carries out field installation. Wallboard is one of the important parts of prefabricated buildings and is widely used, and fiber cement board is a key composition material in the wallboard of the prefabricated buildings.
The glass fiber reinforced cement is a fiber cement composite material which takes alkali-resistant glass fiber as a reinforcing material and cement mortar as a matrix material. The glass fiber is alkali-resistant glass fiber, the common cement is sulphoaluminate cement and silicate cement, and the sand is mostly high-quality natural quartz sand. In China, the main properties of the glass fiber reinforced cement material are as follows: bending ratio ultimate strength of 7.0-8.0 MPa, bending ultimate strength of 15.0-20.0 MPa, and impact strength of 8KJ/m2Left and right. The product of glass fiber reinforced cement can be used as a facing layer and a structural layer of a wallboard in an assembled building board.
The natural quartz sand is quartz particles formed by crushing natural quartz stone and is a silicate mineral with hardness, wear resistance and stable chemical properties. The use of natural sand consumes a large amount of natural resources and is not favorable for environmental protection.
The waste concrete is solid waste produced by demolishing buildings due to the fact that the buildings reach the service life or are aged, the performance indexes of hardness, strength, water absorption and the like of the waste are far lower than those of natural quartz sand, and when the waste concrete is used for replacing natural sand stones to prepare glass fiber reinforced cement materials, the materials with the bending strength, the compressive strength and the impact strength meeting the technical requirements are difficult to prepare.
According to the invention, the waste concrete is used for replacing natural quartz sand, and the glass fiber reinforced cement material with high compressive strength, high impact strength, high bending strength and good freeze-thaw performance, which is applied to the fabricated building, is prepared by adopting a certain process and technical methods such as reinforcement and polymer modification, so that the technical bottleneck of poor mechanical property and durability when the glass fiber reinforced cement material is prepared from solid wastes is broken through, the performance index of the glass fiber reinforced cement material prepared from the solid waste concrete is excellent, and the waste concrete can be changed into valuable.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a glass fiber reinforced cement material applied to an assembly type building and a preparation method thereof, wherein the glass fiber reinforced cement material comprises the following steps: the waste concrete after processing replaces natural quartz sand, a certain preparation process is adopted, and technical methods such as polymer modification and the like are adopted to prepare the glass fiber reinforced cement material which has high compressive strength, high impact strength, high bending strength and good freeze-thaw performance and can be applied to the fabricated building, the technical bottleneck that the mechanical property and the durability are poor when solid waste is used for preparing the glass fiber reinforced cement material is broken through, and the performance index of the glass fiber reinforced cement material prepared by utilizing the solid waste concrete is excellent and is superior to that of the glass fiber reinforced cement material on the market. Under the condition that the initial fluidity reaches 150-400 mm, the compressive strength of the prepared glass fiber reinforced cement material in 7 days reaches more than 40MPa, the impact strength reaches more than 21MPa, the bending proportion ultimate strength reaches more than 8MPa, and the bending strength ultimate strength reaches more than 20 MPa; the freeze-thaw resistance of the material is excellent, after 75 times of freeze-thaw cycles, the mass loss of the material is not more than 3%, the bending limit strength loss is not more than 10%, and the frost resistance index of the material cannot be reached by the glass fiber reinforced cement material in the current market.
In order to achieve the purpose, the invention adopts the following technical scheme:
a glass fiber reinforced cement material prepared from waste concrete is prepared by stirring and spraying the following components in parts by weight: 35-50 parts of cement, 10-50 parts of quartz sand, 5-50 parts of waste concrete particles, 10-20 parts of water, 0.1-2 parts of a water reducing agent, 0.1-1 part of a coagulation regulator, 1-5 parts of a high polymer solution and 3-6 parts of alkali-resistant glass fibers.
In the technical scheme, the cement is quick-hardening sulphoaluminate cement.
In the technical scheme, the quartz sand is a particle formed by crushing and processing natural quartz stone, and the particle size is 0.01-15 mm; the main mineral component is SiO2。
In the technical scheme, the waste concrete particles are particles formed by crushing and processing waste concrete generated by the removal of an existing building, and the particle size is 0.01-15 mm; the mud content is less than 3% (by mass).
In the above technical solution, the water reducing agent includes, but is not limited to, a naphthalene water reducing agent, an aminosulfonic acid water reducing agent, a melamine water reducing agent, and a polycarboxylic acid high performance water reducing agent, and is preferably a polycarboxylic acid high performance water reducing agent.
In the above technical solution, the set control agent is an inorganic and/or organic substance capable of adjusting the setting time of the cement, and includes but is not limited to lignosulfonate, citric acid, metaphosphate, glucose, and tartrate, preferably potassium sodium tartrate.
In the above technical scheme, the high molecular polymer solution is an aqueous acrylate copolymer emulsion.
In the technical scheme, the alkali-resistant glass fiber is alkali-resistant glass fiber roving; the diameter of the fiber is 8-48 μm, and the length of the fiber is 6-50 mm.
The invention also provides a preparation method of the glass fiber reinforced cement material prepared by utilizing the waste concrete, which comprises the following steps:
(1) crushing natural quartz stone into particles with the particle size of 0.01-15 mm for later use; crushing and processing waste concrete generated by building removal into particles with the particle size of 0.01-15 mm and the mud content of less than 3 percent (by mass) for later use;
(2) adding 10-50 parts of quartz stone particles and 5-50 parts of waste concrete particles into a stirrer, adding 35-50 parts of cement, 10-20 parts of water, 0.1-2 parts of a water reducing agent, 0.1-1 part of a coagulation regulator and 1-5 parts of a high molecular polymer solution into the stirrer, stirring for 2-5 minutes, and keeping the fluidity of the slurry to be 150-400 mm;
(3) adding 3-6 parts of alkali-resistant glass fiber into the slurry obtained in the step (2), and simultaneously spraying the slurry and the fiber by adopting a mechanical spraying process to obtain a glass fiber reinforced cement material prepared from waste concrete; the whole preparation process takes 6-10 minutes, and the obtained glass fiber reinforced cement material prepared by using the waste concrete is maintained in a standard curing room for 7 days and then is detected.
Compared with the prior art, the glass fiber reinforced cement material for the high-quality assembly type building board prepared from the waste concrete has the following beneficial effects:
1. the initial fluidity of the slurry is large and reaches 150-400 mm.
2. The glass fiber reinforced cement material prepared from the waste concrete has the advantages of compressive strength of more than 40MPa in 7 days, impact strength of more than 21MPa, bending proportion ultimate strength of more than 8MPa, bending strength of more than 20MPa and excellent performance.
3. The glass fiber reinforced cement material prepared from the waste concrete has excellent frost resistance, is an index which can not be reached by similar materials in the current market, and after 75 times of freeze-thaw cycles, the mass loss is not more than 3 percent, and the bending ultimate strength loss is not more than 10 percent.
4. The glass fiber reinforced cement material prepared by utilizing the waste concrete can be used for high-quality assembly type building boards, and the preparation process is simple.
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but the present invention is not limited to the following descriptions:
example 1:
a glass fiber reinforced cement material prepared by utilizing waste concrete comprises the following components in percentage by weight: the weight ratio of the quick-hardening sulphoaluminate cement, the quartz sand, the waste concrete particles, the water reducing agent, the coagulation regulator, the high polymer solution and the alkali-resistant glass fiber is 38: 32.58: 5.75: 15.2: 0.45: 0.12: 3.14: 4.76;
wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the coagulation regulator is potassium sodium tartrate; the high molecular polymer solution is water-based acrylate copolymer emulsion; the alkali-resistant glass fiber is alkali-resistant glass fiber roving with the fiber diameter of 16 mu m and the fiber length of 21 mm;
is prepared by the following method:
(1) crushing natural quartz stone into particles with the diameter less than 2mm for later use; crushing waste concrete generated by building removal to form particles with the particle size of less than 3mm and the mud content of 1% (by mass) for later use;
(2) adding quartz stone particles and waste concrete particles into a stirrer in proportion, adding cement, water, a water reducing agent and a coagulant-adjusting agent high-molecular polymer solution into the stirrer in proportion, stirring for 3 minutes, and keeping the fluidity of slurry to 350 mm;
(3) and (3) adding alkali-resistant glass fibers into the slurry obtained in the step (2) in proportion, and simultaneously spraying the slurry and the fibers by adopting a mechanical spraying process to obtain the glass fiber reinforced cement material prepared by using waste concrete, wherein the whole preparation process takes 7 minutes.
Then curing the mixture in a standard curing room for 7 days, wherein the compressive strength of the mixture is 44.4MPa and the impact strength of the mixture is 21.3KJ/m in 7 days2The bending proportion ultimate strength reaches more than 8.8MPa, and the bending strength ultimate is 21.80 MPa; after 75 freeze-thaw cycles, the material mass loss was 1.3% and the bend ultimate strength loss was 1.5%.
Example 2:
a glass fiber reinforced cement material prepared by utilizing waste concrete comprises the following components in percentage by weight: the weight ratio of the quick-hardening sulphoaluminate cement, the quartz sand, the waste concrete particles, the water reducing agent, the coagulation regulator, the high polymer solution and the alkali-resistant glass fiber is 42: 25.2: 10.8: 13.86: 0.47: 0.12: 3.15: 4.40;
wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the coagulation regulator is potassium sodium tartrate; the high molecular polymer solution is water-based acrylate copolymer emulsion; the alkali-resistant glass fiber is alkali-resistant glass fiber roving with the fiber diameter of 25 mu m and the fiber length of 34 mm;
is prepared by the following method:
(1) crushing natural quartz stone into particles with the particle size of less than 3mm for later use; crushing waste concrete generated by building removal to form particles with the particle size of less than 4mm and the mud content of 2% (by mass) for later use;
(2) adding quartz stone particles and waste concrete particles into a stirrer in proportion, adding cement, water, a water reducing agent and a coagulant-adjusting agent high-molecular polymer solution into the stirrer in proportion, stirring for 4 minutes, and keeping the fluidity of slurry to be 380 mm;
(3) and (3) adding alkali-resistant glass fibers into the slurry obtained in the step (2) in proportion, and simultaneously spraying the slurry and the fibers by adopting a mechanical spraying process to obtain the glass fiber reinforced cement material prepared by using waste concrete, wherein the whole preparation process takes 8 minutes.
Then curing the mixture in a standard curing room for 7 days, wherein the compressive strength of the mixture is 46MPa and the impact strength of the mixture is 22.3KJ/m in 7 days2The bending strength is 22.6MPa, the bending proportion ultimate strength reaches more than 9.5MPa, and after 75 times of freeze-thaw cycles, the material mass loss is 1.6 percent, and the bending ultimate strength loss is 1.8 percent.
Example 3:
a glass fiber reinforced cement material prepared by utilizing waste concrete comprises the following components in percentage by weight: the weight ratio of the quick-hardening sulphoaluminate cement to the quartz sand to the waste concrete particles to the water reducing agent to the coagulation regulator to the high molecular polymer solution to the alkali-resistant glass fiber is 45: 17.25: 14.11: 15.75: 0.49: 0.12: 3.16: 4.12;
wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the coagulation regulator is potassium sodium tartrate; the high molecular polymer solution is water-based acrylate copolymer emulsion; the alkali-resistant glass fiber is alkali-resistant glass fiber roving with the fiber diameter of 36 mu m and the fiber length of 40 mm;
is prepared by the following method:
(1) crushing natural quartz stone into particles with the particle size of less than 4mm for later use; crushing waste concrete generated by building removal to form particles with the particle size of less than 5mm and the mud content of 3% (by mass) for later use;
(2) adding quartz stone particles and waste concrete particles into a stirrer in proportion, adding cement, water, a water reducing agent and a coagulant-adjusting agent high-molecular polymer solution into the stirrer in proportion, stirring for 5 minutes, and keeping the fluidity of slurry to be 400 mm;
(3) adding alkali-resistant glass fibers into the slurry obtained in the step (2) in proportion, and simultaneously spraying the slurry and the fibers by adopting a mechanical spraying process to obtain the glass fiber reinforced cement material prepared by using waste concrete, wherein the time of the whole preparation process is 9 minutes.
Then curing the mixture in a standard curing room for 7 days, wherein the compressive strength of the mixture is 41.5MPa and the impact strength of the mixture is 20.8KJ/m in 7 days2The bending proportion ultimate strength reaches over 9.3MPa, and the bending strength is 20.8 MPa; after 75 freeze-thaw cycles, the material mass loss was 2.6% and the bend ultimate strength loss was 2.2%.
Example 4:
a glass fiber reinforced cement material prepared by utilizing waste concrete comprises the following components in percentage by weight: the weight ratio of the quick-hardening sulphoaluminate cement, the quartz sand, the waste concrete particles, the water reducing agent, the coagulation regulator, the high polymer solution and the alkali-resistant glass fiber is 46: 12.91: 19.36: 13.8: 0.53: 0.12: 3.16: 4.12;
wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the coagulation regulator is potassium sodium tartrate; the high molecular polymer solution is water-based acrylate copolymer emulsion; the alkali-resistant glass fiber is alkali-resistant glass fiber roving with the fiber diameter of 40 mu m and the fiber length of 48 mm;
is prepared by the following method:
(1) crushing natural quartz stone into particles with the diameter less than 5mm for later use; crushing waste concrete generated by building removal to form particles with the particle size of less than 6mm and the mud content of 3% (by mass) for later use;
(2) adding quartz stone particles and waste concrete particles into a stirrer in proportion, adding cement, water, a water reducing agent and a coagulant-adjusting agent high-molecular polymer solution into the stirrer in proportion, stirring for 5 minutes, and keeping the fluidity of slurry to be 360 mm;
(3) adding alkali-resistant glass fibers into the slurry obtained in the step (2) in proportion, and simultaneously spraying the slurry and the fibers by adopting a mechanical spraying process to obtain the glass fiber reinforced cement material prepared by using waste concrete, wherein the whole preparation process takes 10 minutes.
Then curing the mixture in a standard curing room for 7 days, wherein the compressive strength is 41.8MPa, the impact strength is 23.4KJ/m2, the bending proportion ultimate strength is more than 8.8MPa, and the bending strength ultimate limit is 20.1MPa after 7 days; after 75 freeze-thaw cycles, the material mass loss was 2.8%, and the bending ultimate strength loss was 2.9%
The above examples are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. The glass fiber reinforced cement material prepared from waste concrete is characterized by being prepared by stirring and spraying the following components in parts by weight: 35-50 parts of cement, 10-50 parts of quartz sand, 5-50 parts of waste concrete particles, 10-20 parts of water, 0.1-2 parts of a water reducing agent, 0.1-1 part of a coagulation regulator, 1-5 parts of a high polymer solution and 3-6 parts of alkali-resistant glass fibers;
the cement is quick-hardening sulphoaluminate cement;
the quartz sand is a particle formed by crushing natural quartz stone, the particle size is 0.01-3 mm, and the main mineral component is SiO2；
The waste concrete particles are particles formed by crushing and processing waste concrete generated by the removal of the existing building, the particle size is 0.01-4 mm, and the mud content is less than 3% by mass;
the water reducing agent is a polycarboxylic acid high-performance water reducing agent;
the coagulation regulator is potassium sodium tartrate;
the high molecular polymer solution is water-based acrylate copolymer emulsion.
The alkali-resistant glass fiber is alkali-resistant glass fiber roving; the diameter of the fiber is 8-48 μm, and the length of the fiber is 6-50 mm.
2. The method for preparing a glass fiber reinforced cement material prepared from waste concrete according to claim 1, comprising the steps of:
(1) crushing natural quartz stone into particles with the particle size of 0.01-3 mm for later use; crushing and processing waste concrete generated by building removal into particles with the particle size of 0.01-4 mm and the mud content of less than 3% by mass for later use;
(2) adding 10-50 parts of quartz stone particles and 5-50 parts of waste concrete particles into a stirrer, adding 35-50 parts of cement, 10-20 parts of water, 0.1-2 parts of a water reducing agent, 0.1-1 part of a coagulation regulator and 1-5 parts of a high molecular polymer solution into the stirrer, stirring for 2-5 minutes, and keeping the fluidity of the slurry to be 150-400 mm;
(3) and (3) adding 3-6 parts of alkali-resistant glass fiber into the slurry obtained in the step (2), and simultaneously spraying the slurry and the fiber by adopting a mechanical spraying process to obtain the glass fiber reinforced cement material prepared from waste concrete, wherein the time of the whole preparation process is 6-10 minutes.
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| CN109231922A (en) * | 2018-10-29 | 2019-01-18 | 中国建材检验认证集团北京天誉有限公司 | A method of glass fiber reinforced cement is prepared using useless red brick powder |
| CN110683811A (en) * | 2019-10-28 | 2020-01-14 | 江苏金石源新材料有限公司 | Reinforced cement material prepared from solid-waste mixture and preparation method |
| CN111285652B (en) * | 2020-03-14 | 2021-01-26 | 新疆西部丝路交通产业创新联盟科技有限公司 | High-performance concrete |
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| CN111548104A (en) * | 2020-06-01 | 2020-08-18 | 中国建材检验认证集团北京天誉有限公司 | Low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement |
| CN111620633A (en) * | 2020-06-01 | 2020-09-04 | 中国建材检验认证集团北京天誉有限公司 | White belite sulphoaluminate cement GRC 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 |
| CN112225494A (en) * | 2020-09-22 | 2021-01-15 | 吴敬军 | Mortar and preparation method thereof |
| CN112919864A (en) * | 2021-03-08 | 2021-06-08 | 中交武汉港湾工程设计研究院有限公司 | Recycled aggregate fiber reinforced shotcrete and preparation method thereof |
| CN114835453B (en) * | 2022-05-14 | 2023-05-02 | 北京永一格国际展览有限公司 | Glass fiber concrete and prefabricated product |
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