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A kind of plastic cracking material of cement-based material

A cement-based material and plastic technology, applied in the field of material science and engineering, can solve the problems of reducing the strength of structural concrete, affecting the appearance of products, affecting the performance and service life of structures, and achieving improved frost resistance and reduced plastic shrinkage cracking performance. small effect

Active Publication Date: 2021-02-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Plastic shrinkage cracks not only affect the appearance of the product, but also reduce the strength of the structural concrete, affect the performance and service life of the structure, and bring inconvenience to people's life and production. Therefore, it is very necessary to study plastic cracking materials for cement-based materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The mass percent of the plastic cracking material is: 50% of super absorbent polymer, 30% of cellulose ether, and 20% of polyether. Polyacrylamide is selected as the superabsorbent polymer; hydroxyethyl methylcellulose is selected as the cellulose ether, and propylene glycol polyether is selected as the polyether. Weigh each material according to the above ratio, place it in a mixing container and stir evenly, and then obtain the product of the present invention.

[0029] After this product is mixed into cement mortar (42.5 ordinary cement: medium sand: water = 1:1:0.5) at 0.01% by mass, the reduction rate of plastic shrinkage cracking is about 50% as measured by the plate method.

Embodiment 2

[0031] The mass percentage of the plastic cracking material is: 40% of super absorbent polymer, 40% of cellulose ether, and 20% of polyether. Sodium polyacrylate is selected as the superabsorbent polymer; hydroxypropyl methylcellulose is selected as the cellulose ether, and glycerol polyether is selected as the polyether. Weigh each material according to the above ratio, place it in a mixing container and stir evenly, and then obtain the product of the present invention.

[0032] After the product of the present invention is mixed into cement mortar (42.5 ordinary cement: medium sand: water = 1: 1: 0.5) with 0.1% mass fraction, the reduction rate of plastic shrinkage cracking is about 100% measured by plate method.

Embodiment 3

[0034] The mass percentage of the plastic cracking material is: 50% of super absorbent polymer, 50% of cellulose ether, and 0% of polyether. The superabsorbent polymer is polyacrylamide; the cellulose ether is hydroxyethyl methyl cellulose. Weigh each material according to the above ratio, place it in a mixing container and stir evenly, and then obtain the product of the present invention. After mixing this product with 0.05% mass fraction of cement mortar (42.5 ordinary cement: medium sand: water = 1:1:0.5), the reduction rate of plastic shrinkage cracking is about 80% measured by plate method.

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Abstract

The invention relates to a plastic cracking material for cement-based materials, which belongs to the field of material science and engineering technology. It is composed of 0-100% super absorbent polymer, 0-100% cellulose ether and 0-100% polyether. Measure according to the above mass percentage, place it in a mixing container and stir evenly to obtain the product of the present invention. When used, the dosage of the plastic cracking material is 0.01-0.1% of the cement mass in the cement-based material. After the plastic cracking material is added, the plastic shrinkage cracking performance of the cement-based material is greatly reduced. When the mortar plate method is used to test, the total weight of the plastic shrinkage cracking can be reduced by 50%-100% compared with that without the addition; the cement-based material The workability, compressive strength, and flexural strength of cement-based materials are not affected, and can even be improved; the impermeability and frost resistance of cement-based materials can be improved to a certain extent. Using the cement-based material project of the present invention, such as cement concrete pavement, bridge deck, floor, slope protection, dam, airport runway and other projects, the degree of plastic shrinkage cracking is reduced.

Description

technical field [0001] The invention relates to a plastic cracking material of cement base material. The plastic cracking material can be used in cement-based materials to reduce the degree of plastic shrinkage cracking. It belongs to the field of material science and engineering technology. [0002] technical background [0003] Among many building materials, cement-based materials are the most widely used civil engineering materials, with the widest application range and the largest consumption, and because of their cheap price, good durability, and easy casting, they are widely used in civil engineering. It is irreplaceable. In the 21st century, concrete will still be the main building material that cannot be replaced by modern engineering construction in our country. However, many of the buildings that have been put into use have cracks, causing many buildings to have various quality and safety problems before they reach the designed service life, and some highway bridg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
CPCC04B24/383C04B24/32C04B24/2652C04B28/00C04B24/2641
Inventor 马一平
Owner TONGJI UNIV
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