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PVA-ECC (Polyvinyl Acetate-Engineered Cementitious Composite) high-toughness fiber cement based composite material and preparation method thereof

A PVA-ECC, fiber cement technology, applied in the field of building materials, can solve the problems of low toughness, poor adhesion, etc., to achieve high water resistance, improve flexibility, and improve the effect of compactness

Inactive Publication Date: 2018-10-19
吴远怀
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-toughness cement-based composite material of this invention is simply mixed with raw materials, but there are still problems such as poor cohesion and low toughness.

Method used

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  • PVA-ECC (Polyvinyl Acetate-Engineered Cementitious Composite) high-toughness fiber cement based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The whiskers are magnesium hydroxide whiskers, silicon carbide whiskers, and calcium carbonate whiskers mixed in a weight ratio of 1:1:1;

[0028] Take rice straw and crop stalks to dry and crush them, place the crushed crop straws in a carbonization furnace device for carbonization, set the carbonization temperature to 300°C, and carbonization time to 83 minutes, and finally crush the carbonized crop straws into 150 meshes to obtain crop straw powder;

[0029] Preparation of modified clay / diatomite composite material: Take 4 parts of maleic anhydride and put them into the reactor, add 30 parts of deionized water to make a slurry, stir and disperse at 60°C for 30 minutes, set the speed of the reactor to 450r / min, then add 4 parts of clay and 5 parts of diatomaceous earth into the dispersed mud liquid, keep the temperature and rotation speed constant, stir and disperse for 3h, then lower the temperature to room temperature, let it stand, and suction filter, 52 Dry at ℃ ...

Embodiment 2

[0033] Whiskers are magnesium hydroxide whiskers, silicon carbide whiskers, and calcium carbonate whiskers mixed in a weight ratio of 1:1:1

[0034] The sugarcane crop stalks are dried in the sun and crushed, and the crushed crop stalks are placed in a carbonization furnace for carbonization. The carbonization temperature is set at 310°C, and the carbonization time is 80 minutes. Finally, the carbonized crop stalks are crushed into 120 meshes to obtain crop straw powder;

[0035] Preparation of modified clay / diatomite composite material: Take 5 parts of maleic anhydride and put them into the reactor, add 35 parts of deionized water to make a slurry, stir and disperse at 60°C for 30 minutes, set the speed of the reactor to 458r / min, then add 5 parts of clay and 3.5 parts of diatomaceous earth into the dispersed mud liquid, keep the temperature and rotation speed constant, stir and disperse for 4h, then lower the temperature to room temperature, let it stand, and suction filter,...

Embodiment 3

[0039] The whiskers are magnesium hydroxide whiskers, silicon carbide whiskers, and calcium carbonate whiskers mixed in a weight ratio of 1:1:1;

[0040] Take the corn crop stalks and dry them for crushing, place the crushed crop stalks in the carbonization furnace for carbonization, set the carbonization temperature at 350°C, and the carbonization time for 85 minutes, and finally crush the carbonized crop stalks into 140 meshes to obtain crop straw powder;

[0041] Preparation of modified clay / diatomite composite material: Take 3.5 parts of maleic anhydride and put it into a reactor, add 50 parts of deionized water to make a slurry, stir and disperse for 30 minutes at a temperature of 60°C, set the speed of the reactor to 500r / min, then add 4 parts of clay and 4.5 parts of diatomaceous earth into the dispersed mud liquid, keep the temperature and rotation speed constant, stir and disperse for 3.2 hours, then lower the temperature to room temperature, stand still, and suction ...

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Abstract

The invention belongs to the technical field of building materials and in particular relates to a PVA-ECC (Polyvinyl Acetate-Engineered Cementitious Composite) high-toughness fiber cement based composite material and a preparation method thereof. The PVA-ECC high-toughness fiber cement based composite material is prepared from the following components in parts by weight: 25 to 35 parts of 525 white cement, 40 to 60 parts of quartz sand, 18 to 20 parts of titanium white, 1 to 10 parts of pitchstone vitrified microspheres, 0.5 to 2 parts of PVA cellulose, 6 to 8 parts of ionic liquid, 10 to 12 parts of crop straw powder, 3 to 6 parts of clay, 3 to 5 parts of diatomite, 3 to 5 parts of maleic anhydride, 1 to 3 parts of crystal whiskers, 3 to 6 parts of a silane coupling agent, 0.5 to 2 partsof cellulose ether, 0.3 to 2 parts of redispersible latex powder, 0.1 to 3 parts of a high-efficiency water reducing agent, 0.5 to 2 parts of an inorganic pigment and 90 to 100 parts of water. The preparation method comprises the following steps: taking the maleic anhydride, the clay, the diatomite and the PVA cellulose as raw materials to prepare a PVA fiber / clay / diatomite nano composite material, and then mixing and stirring the PVA fiber / clay / diatomite nano composite material with other raw materials.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a PVA-ECC high-toughness fiber cement-based composite material and a preparation method thereof. Background technique [0002] With the development of the field of concrete structures, the expansion of scale and the development of structural engineering to higher and larger aspects, the performance requirements of concrete structures are also getting higher and higher. In order to meet the needs of development, it is necessary to improve the structural materials of concrete, so as to improve its performance indicators. [0003] Polyvinyl alcohol fiber (PVA), also known as vinylon fiber, is characterized by high strength, high modulus, wear resistance, good acid and alkali resistance, and good weather resistance. Crack resistance performance, can also greatly improve the denaturation ability of concrete. [0004] Polyvinyl alcohol fiber reinforced cement-based composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/34C04B111/28
CPCC04B28/04C04B2111/28C04B2111/343C04B2201/50C04B14/06C04B14/305C04B18/24C04B14/383C04B14/22C04B24/003C04B24/42C04B24/383C04B2103/0057C04B2103/302C04B2103/54C04B22/002C04B16/0641C04B14/10C04B14/08C04B24/04Y02A30/30
Inventor 吴远怀
Owner 吴远怀
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