Self-repairing anti-shrink cement based composite material

A composite material and anti-shrinkage technology, which is applied in the field of repair materials, can solve the problems affecting the safety and long-term durability of concrete structures, poor concrete cohesion, and large dry shrinkage of the matrix, etc., to improve the bending strength and increase the bonding force , improve the effect of interaction

Inactive Publication Date: 2013-08-21
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, long-term use and weathering will cause concrete cracking, the crack width is large, and harmful substances (chloride ions, sulfate ions, etc.) can quickly invade, and it is more vulnerable to erosion in coastal areas, which seriously affects the safety and long-term durability of concrete structures. sex
Experiments have proved that ordinary mortar is not effective as a repair material, and its bonding force with concrete is poor. After a period of repair, cracking and other phenomena will occur
Fiber-reinforced cement-based composites are used as repair materials. Although the performance of the material is enhanced and the cohesiveness is improved, the reduction in the particle size of the aggregate will cause a large dry shrinkage of the matrix, and the increase in early shrinkage is also the main cause of early cracks. reason

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The composition of the self-repairing anti-shrinkage cement-based composite material of this embodiment and the weight ratio of each raw material are as follows: 650 parts by weight of 52.5 ordinary Portland cement, 450 parts by weight of fly ash, 650 parts by weight of sand, 390 parts by weight of water, water-based ring 60 parts by weight of oxygen emulsion, 6 parts by weight of curing agent, 2 parts by weight of defoamer, 1 part by weight of water reducing agent, 30 parts by weight of polyvinyl alcohol fiber [for example: 650 kg of 52.5 ordinary Portland cement, 450 kg of fly ash , 650 kilograms of sand, 390 kilograms of water, 60 kilograms of water-based epoxy emulsions, 6 kilograms of curing agents, 2 kilograms of defoamers, 1 kilogram of water reducing agents, and 30 kilograms of polyvinyl alcohol fibers; that is, parts by weight in the present invention refer to each The substances are weighed according to the same mass unit]. The polyvinyl alcohol fiber has a le...

Embodiment 2

[0026] The composition of the present embodiment self-repairing anti-shrinkage cement-based composite material and the weight ratio of each raw material are as follows: 600 parts by weight of 52.5 sulfoaluminate cement, 400 parts by weight of fly ash and iron slag (fly ash and iron slag The mass ratio is 2:3), 600 parts by weight of sand, 264 parts by weight of water, 20 parts by weight of styrene-butadiene emulsion, 4 parts by weight of curing agent, 1 part by weight of defoamer, 1 part by weight of water reducing agent, aramid fiber 40 parts by weight. The length of the aramid fibers is 3 mm to 20 mm, the diameter is 10 μm to 40 μm, and the elastic modulus is 2000 MPa to 40 GPa; the sand is fine sand with a particle size of 125 to 200 μm.

[0027] The material performance test method and basis are the same as in Example 1.

[0028] Test result: 180 days self-shrinkage rate 380×10 -6 . The load force in the bending load test was 5000 N, the average crack width was 50 μm, a...

Embodiment 3

[0030] The composition of the self-repairing anti-shrinkage cement-based composite material of this embodiment and the weight ratio of each raw material are as follows: 800 parts by weight of 52.5R ordinary Portland cement, 400 parts by weight of fly ash, 500 parts by weight of sand, 552 parts by weight of water, acrylic acid 80 parts by weight of emulsion, 6 parts by weight of curing agent, and 62 parts by weight of polyester fiber. The polyester fiber has a length of 3 mm to 20 mm, a diameter of 10 μm to 40 μm, and an elastic modulus of 2000 MPa to 40 GPa; the sand is fine sand with a particle size of 125 to 200 μm.

[0031] The material performance test method and basis are the same as in Example 1.

[0032] Test result: 180 days self-shrinkage rate 390×10 -6 . The load force in the bending load test was 5000 N, the average crack width was 50 μm, and the maximum crack width was 75 μm. In the tensile test, the pre-added strain was 2%, the average width of cracks at 3 days...

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Abstract

The invention discloses a self-repairing anti-shrink cement based composite material which comprises the following components in parts by weight: 400-800 parts of cement, 200-600 parts of waste, 400-1000 parts of sand, 264-528 parts of water, 10-70 parts of fiber, 4-10 parts of additive and polymer emulsion which accounts for 5%-10% of the gross weight of the cement. The self-repairing anti-shrink cement based composite material has good anti-shrink performance, impermeability and durability. When having a crack, the material can realize a self-repairing function under field conditions, and can be used as restorative materials for retaining walls, road mat coats, concrete pipelines, oil and gas pipelines, dams and the like.

Description

technical field [0001] The invention relates to a repairing material, in particular to a self-repairing anti-shrinkage cement-based composite material. Background technique [0002] Concrete is widely used in construction facilities due to its good performance and low price. However, long-term use and weathering will cause concrete cracking, the crack width is large, and harmful substances (chloride ions, sulfate ions, etc.) can quickly invade, and it is more susceptible to erosion in coastal areas, which seriously affects the safety and long-term durability of concrete structures. sex. Experiments have proved that ordinary mortar is not effective as a repair material, and its bonding force with concrete is poor. After a period of repair, cracking and other phenomena will occur. Fiber-reinforced cement-based composites are used as repair materials. Although the material performance is enhanced and the cohesion is improved, the reduction in aggregate particle size will caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B28/04
Inventor 孙乾耀吴英孙士彬
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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