CN110759682A - Environment-friendly high-toughness fiber reinforced cement-based composite material and preparation method thereof - Google Patents
Environment-friendly high-toughness fiber reinforced cement-based composite material and preparation method thereof Download PDFInfo
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- CN110759682A CN110759682A CN201911202560.4A CN201911202560A CN110759682A CN 110759682 A CN110759682 A CN 110759682A CN 201911202560 A CN201911202560 A CN 201911202560A CN 110759682 A CN110759682 A CN 110759682A
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- cement
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an environment-friendly high-toughness fiber reinforced cement-based composite material and a preparation method thereof, wherein the environment-friendly high-toughness fiber reinforced cement-based composite material comprises the following raw materials in percentage by mass: 10-25% of cement, 15-35% of copper tailing sand, 15-35% of ground copper tailing powder, 0.2-1.2% of polyacrylonitrile fiber, 5-15% of fly ash, 0.1-0.5% of a water reducing agent and 10-30% of water, wherein the sum of the mass percentages of the raw materials is 100%. The invention mixes a large amount of copper tailing waste, so that the industrial waste is recycled, and the pollution to the surrounding environment is reduced; meanwhile, by doping the polyacrylonitrile short fiber, the bending resistance, tensile resistance, crack resistance, permeability resistance, corrosion resistance and other properties of the material are further optimized, so that the material is suitable for being used in complex environments.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an environment-friendly high-toughness fiber reinforced cement-based composite material (ECC material) and a preparation method thereof.
Background
With the rapid development of modern metallurgical industry, abundant mineral resources in various parts of China are gradually developed and utilized (such as Fujianningdengthan georgite), but the problems of tailings and waste materials are urgently solved. The accumulation of these industrial wastes creates various environmental pollutions. In fact, the tailings are only resources which are misplaced, and because the mining industry in China starts late, the technical development is unbalanced, a large amount of valuable resources are left in the tailings and cannot be utilized, so that huge waste of resources is caused, and how to fully and valuably utilize various industrial tailings and waste materials is a problem which we have to face at present.
The polyacrylonitrile fiber is a high-strength bundle-shaped monofilament fiber which is prepared by taking polypropylene as a main material and adopting a unique production process, and the polyacrylonitrile fiber is added into the cement-based material to effectively control the plastic shrinkage of the material, so that the cohesive force of the cement-based material is increased, the water in the material is difficult to freely move, and the possibility of cracking of the material is reduced. The polyacrylonitrile fiber has a higher elastic modulus, the elastic modulus of the polyacrylonitrile fiber is even similar to that of cement, and when the polyacrylonitrile fiber bears load, the polyacrylonitrile fiber has the function of transferring load. In the plastic development stage of the material, the more the number of the fibers is, the larger the interface adsorption binding force and the mechanical meshing force between the fibers and the cement-based material are, and the fibers can bear larger plastic anti-cracking stress, so that the anti-cracking plastic strength of the material is increased. Meanwhile, the cement-based material has good anti-permeability performance due to the doping of a large amount of fibers, and can meet certain anti-permeability and anti-corrosion requirements in coastal areas. And the polyacrylonitrile fiber is more superior in the aspects of plastic deformation resistance, permeability resistance and corrosion resistance of the cement-based material.
The engineering cement-based composite material (ECC material) is a novel high-performance cement-based composite material, and the short fibers with the doping amount not more than 2.5% of the total volume of the composite material are doped in the material, so that the hardened material has remarkable strain hardening characteristics, fine cracks generated by the hardened material can be uniformly distributed under the action of tensile load, the ultimate tensile strain can stably reach more than 3% and can maximally reach 8%, and therefore, compared with the traditional cement-based material, the ECC material has the advantages of high toughness, high impermeability, high impact resistance, high wear resistance and the like.
Disclosure of Invention
The invention aims to provide an environment-friendly high-toughness fiber-reinforced ECC material and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the environment-friendly high-toughness fiber reinforced cement-based composite material comprises the following raw materials in percentage by mass: 10-25% of cement, 15-35% of copper tailing sand, 15-35% of ground copper tailing powder, 0.2-1.2% of polyacrylonitrile fiber, 5-15% of fly ash, 0.1-0.5% of a water reducing agent and 10-30% of water, wherein the sum of the mass percentages of the raw materials is 100%.
Wherein the cement is ordinary portland cement with the strength grade of P.O 42.5.5.
The copper tailing sand is prepared by mixing copper tailing medium sand with the particle size of 0.35-0.5 mm and copper tailing coarse sand with the particle size of 0.6-0.75 mm from Fujiangningde areas according to the weight ratio of 4: 6.
The ground copper tailing powder is prepared by grinding copper tailing slag from Fujiangningde area to the particle size of 0.01-0.015 mm.
The polyacrylonitrile fiber has the length of 6mm and the diameter of 10-20 μm.
The fly ash is I-grade fly ash.
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
The preparation method of the environment-friendly high-toughness fiber reinforced cement-based composite material comprises the following steps:
(1) mixing cement, copper tailing sand, ground copper tailing powder and fly ash in proportion and stirring for 1-2 min;
(2) mixing a water reducing agent and water in proportion, stirring to form a solution, adding the solution into the mixed material obtained in the step (1) for three times, and stirring for 1-2 min after each addition to uniformly mix the solution;
(3) and (3) adding the polyacrylonitrile fibers into the mixed material liquid obtained in the step (2) for three times according to the proportion, and stirring for 2min after adding every time to uniformly mix the polyacrylonitrile fibers to obtain the polyacrylonitrile fibers.
Compared with the existing material, the invention has the following characteristics and beneficial effects:
(1) the invention adopts the copper tailing sand to completely replace river sand fine aggregate, fully utilizes industrial waste materials with different grain sizes while reducing the material cost, and achieves the purposes of saving resources and protecting the environment.
(2) The invention utilizes the finely ground copper tailing powder and the fly ash to replace part of cement raw materials, the replacement rate reaches about 60 percent, and the maximization of the secondary utilization of resources is explored while the cost is reduced and the resources are saved.
(3) According to the invention, the copper tailing sand and the ground copper tailing powder are added, and the copper tailing sand is designed by matching two copper tailing coarse sand and medium sand with different particle sizes, so that the cementing property between a material matrix and fibers can be increased, the compactness of the material is effectively improved, the porosity is reduced, and the performances of the material, such as toughness, impermeability, cracking resistance and the like, are further improved.
(4) The polyacrylonitrile fiber adopted in the invention has small diameter and more number in unit volume, and the more the number of the fiber is, the larger the interface adsorption cohesive force, mechanical engaging force and the like between the fiber and the cement base material are, the more the number of the fiber is doped in the material, the anti-cracking, anti-permeability and anti-corrosion properties of the material are obviously improved, and the polyacrylonitrile fiber has higher elastic modulus, so that the material has more excellent performance in resisting plastic deformation, and in addition, the acid corrosion resistance of the polyacrylonitrile fiber can also improve the anti-corrosion requirement of the cement base material.
Detailed Description
In order to make the technical purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are further described with reference to specific examples, which are intended to explain the present invention and are not to be construed as limiting the present invention, and those who do not specify a specific technique or condition in the examples follow the techniques or conditions described in the literature in the art or follow the product specification. The following are two specific examples:
the cement used was ordinary portland cement with a strength grade of P.O 42.5.5.
The copper tailing sand is prepared by mixing copper tailing medium sand with the grain size of 0.35-0.5 mm and copper tailing coarse sand with the grain size of 0.6-0.75 mm from Fujiangningde areas according to the weight ratio of 4: 6.
The used ground copper tailing powder is prepared by grinding copper tailing slag from Fujianningde area to the particle size of 0.01-0.015 mm.
The polyacrylonitrile fibres used had a length of 6mm and a diameter of about 15 μm.
The fly ash used is I-grade fly ash.
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Example 1:
mixing 18% of cement, 24% of copper tailing sand, 27.5% of ground copper tailing powder and 10% of fly ash for 1 min; adding a solution prepared by mixing 20% of water and 0.2% of water reducing agent into the well mixed dry material for three times, and stirring for 1min after each addition; adding 0.3 percent of polyacrylonitrile fiber (PAN) into the uniformly mixed material for three times, and stirring for 2min after adding every time to prepare the environment-friendly high-toughness fiber reinforced cement-based composite material.
Example 2:
mixing 15% of cement, 28% of copper tailing sand, 24% of ground copper tailing powder and 10% of fly ash for 1 min; adding a solution prepared by mixing 22% of water and 0.3% of water reducing agent into the well mixed dry material for three times, and stirring for 1min after each addition; adding 0.7 percent of polyacrylonitrile fiber (PAN) into the uniformly mixed material for three times, and stirring for 2min after adding every time to prepare the environment-friendly high-toughness fiber reinforced cement-based composite material.
Comparative example 1:
mixing 15% of cement, 14% of copper tailing medium sand with the particle size of 0.35-0.5 mm, 14% of copper tailing coarse sand with the particle size of 0.6-0.75 mm, 24% of ground copper tailing powder and 10% of fly ash for 1 min; adding a solution prepared by mixing 22% of water and 0.3% of water reducing agent into the well mixed dry material for three times, and stirring for 1min after each addition; adding 0.7 percent of polyacrylonitrile fiber (PAN) into the uniformly mixed material for three times, and stirring for 2min after adding every time to prepare the fiber reinforced cement-based composite material.
Comparative example 2:
mixing 15% of cement, 52% of superfine iron tailing sand with the average particle size of 0.025mm and 10% of fly ash for 1 min; adding a solution prepared by mixing 22% of water and 0.3% of water reducing agent into the well mixed dry material for three times, and stirring for 1min after each addition; adding 0.7 percent of polyacrylonitrile fiber (PAN) into the uniformly mixed material for three times, and stirring for 2min after adding every time to prepare the fiber reinforced cement-based composite material.
Comparative example 3:
mixing 15% of cement, 28% of copper tailing sand, 24% of ground copper tailing powder and 10% of fly ash for 1 min; adding a solution prepared by mixing 22% of water and 0.3% of water reducing agent into the well mixed dry material for three times, and stirring for 1min after each addition; 0.7 percent of polyvinyl alcohol fiber (PVA, the length is 6mm, the diameter is about 30 mu m) is added into the evenly mixed material for three times, and the mixture is stirred for 2min after each addition, thus obtaining the fiber reinforced cement-based composite material.
The performance tests of examples 1 and 2 and comparative examples 1 to 3 were carried out under the same conditions, the flexural strength was measured according to the Cement mortar Strength test method (GB 17671-1999), a 40mm X160 mm prism test piece was used, the standard curing was carried out for 28 days, the flexural strength test was carried out, the impact toughness was measured by the drop weight test, and the cleavage tensile strength was carried out according to the Standard test method for mechanical Properties of general concrete (GB/T50081-2002). The results of the experiments are shown in the following table:
as can be seen from the above table, compared with the materials obtained in comparative examples 1-3, the impact toughness of the materials prepared in examples 1 and 2 of the present invention is improved significantly, and the tensile strength at split and the breaking strength are improved to different degrees.
The invention adopts industrial waste as main raw material to prepare the fiber reinforced cement-based material, and the method is beneficial to reducing the manufacturing cost, saving resources, solving the problem of environmental pollution caused by the industrial waste and protecting the environment.
The ECC material is prepared by stirring copper tailing waste, fly ash, cement, a water reducing agent, Polyacrylonitrile (PAN) and water, has wide raw material source and simple preparation process, can reduce the preparation cost of the material, and improves the performance of the fiber reinforced cement-based material.
The polyacrylonitrile fiber (PAN) used in the invention can effectively improve the cohesiveness of slurry, and improve the tensile strength, the breaking strength, the impact toughness and the like of the material. Meanwhile, the cement-based material has good anti-permeability and anti-cracking performance due to the doping of a large amount of fibers, and the acid corrosion resistance of the polyacrylonitrile fibers can improve the anti-corrosion requirement of the cement-based material.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (8)
1. The environment-friendly high-toughness fiber reinforced cement-based composite material is characterized by comprising the following raw materials in percentage by mass: 10-25% of cement, 15-35% of copper tailing sand, 15-35% of ground copper tailing powder, 0.2-1.2% of polyacrylonitrile fiber, 5-15% of fly ash, 0.1-0.5% of a water reducing agent and 10-30% of water, wherein the sum of the mass percentages of the raw materials is 100%.
2. The environmentally friendly, high toughness fiber cement-based composite material of claim 1, wherein the cement is P.O 42.5.5 Portland cement.
3. The environment-friendly high-toughness fiber-reinforced cement-based composite material as claimed in claim 1, wherein the copper tailing sand is prepared by mixing copper tailing medium sand with a particle size of 0.35-0.5 mm from Fujianningde area and copper tailing coarse sand with a particle size of 0.6-0.75 mm according to a weight ratio of 4: 6.
4. The environment-friendly high-toughness fiber-reinforced cement-based composite material as claimed in claim 1, wherein the ground copper tailings powder is prepared by grinding copper tailings from Fujiangningde area to a particle size of 0.01-0.015 mm.
5. The environment-friendly high-toughness fiber-reinforced cement-based composite material as claimed in claim 1, wherein the polyacrylonitrile fiber has a length of 6mm and a diameter of 10-20 μm.
6. The environment-friendly high-toughness fiber-reinforced cement-based composite material according to claim 1, wherein the fly ash is class I fly ash.
7. The environment-friendly high-toughness fiber-reinforced cement-based composite material according to claim 1, wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
8. The method for preparing the environment-friendly high-toughness fiber-reinforced cement-based composite material as recited in any one of claims 1 to 7, comprising the steps of:
(1) mixing cement, copper tailing sand, ground copper tailing powder and fly ash in proportion and stirring for 1-2 min;
(2) mixing a water reducing agent and water in proportion, stirring to form a solution, adding the solution into the mixed material obtained in the step (1) for three times, and stirring for 1-2 min after each addition;
(3) and (3) adding polyacrylonitrile fibers into the mixed material liquid obtained in the step (2) for three times according to a proportion, and stirring for 2min after adding every time to obtain the polyacrylonitrile fiber material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860814A (en) * | 2021-09-18 | 2021-12-31 | 沈阳工业大学 | Copper tailing powder active powder concrete and preparation method thereof |
| CN117964319A (en) * | 2024-03-28 | 2024-05-03 | 湖南瑞砂环境科技有限公司 | Polymer cement mortar based on tungsten tailings and preparation method and application thereof |
| CN118164735A (en) * | 2024-04-07 | 2024-06-11 | 重庆市鲁渝矿业发展有限公司 | Cement material based on recycled barium residues and preparation method thereof |
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Cited By (3)
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| CN113860814A (en) * | 2021-09-18 | 2021-12-31 | 沈阳工业大学 | Copper tailing powder active powder concrete and preparation method thereof |
| CN117964319A (en) * | 2024-03-28 | 2024-05-03 | 湖南瑞砂环境科技有限公司 | Polymer cement mortar based on tungsten tailings and preparation method and application thereof |
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Application publication date: 20200207 |