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PVA (polyvinyl alcohol) powder modified rubber concrete and preparation method thereof

A technology for modifying rubber and concrete, which is applied in the field of concrete, and can solve problems such as strength reduction, and achieve the effects of reducing strength loss, improving performance, and increasing durability

Inactive Publication Date: 2019-09-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at reducing the strength of the existing large-volume rubber concrete, and provides a PVA powder-modified rubber concrete and a preparation method thereof, which uses the characteristics of PVA powder to improve the interface properties of the rubber concrete, and improves the mechanical properties of the large-volume rubber concrete. performance, thereby improving the performance of large-volume rubber concrete, which can play a role in reducing strength loss, improving toughness, preventing cracking and impermeability, and improving durability, so as to make high-performance concrete

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  • PVA (polyvinyl alcohol) powder modified rubber concrete and preparation method thereof
  • PVA (polyvinyl alcohol) powder modified rubber concrete and preparation method thereof

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preparation example Construction

[0032] The preparation method of PVA powder modified rubber concrete of the present invention is:

[0033] In order to fully contact the PVA powder with the rubber particles, first, according to the amount of PVA powder and water, dissolve the PVA powder in water, make a PVA solution, and then mix the concrete. In order to ensure that the PVA powder is soluble in water and not decomposed, first put the PVA powder in a container and heat it at 75°C for 5 hours to dissolve it in water. After dissolving, let it stand for 0.5 hours to make a PVA solution and seal it for storage.

[0034] When preparing PVA powder-modified rubber concrete, according to the amount of rubber particles, put the rubber particles into the PVA solution, and put the PVA solution containing rubber particles into the ultrasonic equipment and use ultrasonic waves to disperse for 15 to 30 minutes to make the rubber particles Fully mix with the PVA solution; then, pour the cement, fine aggregate, coarse aggregat...

Embodiment 1

[0037] The amount of cement is 400kg / m 3 Concrete, the amount of fine aggregate is 800kg / m 3 Concrete, the amount of coarse aggregate is 1000kg / m 3 Concrete, the amount of rubber particles is 80kg / m 3 For concrete, the dosage of silica fume is 0kg / m 3 Concrete, the amount of expansion agent is 0kg / m 3 For concrete, the dosage of PVA powder is 0.6kg / m 3 Concrete, the amount of water is 120kg / m 3 For concrete, the dosage of water reducer is 2kg / m 3 Concrete, made by mixing cement, fine aggregate, coarse aggregate, rubber particles, silica fume, expansion agent, PVA powder, water and water reducer, with an apparent density of 2400kg / m 3 of concrete. The mix ratio has a lower amount of PVA powder, and the cost is the cheapest. Compared with ordinary rubber concrete, its compressive strength is increased by 15%, and its flexural strength is increased by 10%.

Embodiment 2

[0039] The amount of cement is 450kg / m 3 Concrete, the amount of fine aggregate is 700kg / m 3 Concrete, the amount of coarse aggregate is 900kg / m 3 Concrete, the amount of rubber particles is 140kg / m 3 For concrete, the dosage of silica fume is 5kg / m 3 Concrete, the amount of expansion agent is 10kg / m 3 For concrete, the dosage of PVA powder is 0.90kg / m 3 Concrete, the amount of water is 135kg / m 3 For concrete, the dosage of water reducer is 4.5kg / m 3 Concrete, made by mixing cement, fine aggregate, coarse aggregate, rubber particles, silica fume, expansion agent, PVA powder, water and water reducer, with an apparent density of 2350kg / m 3 of concrete. The mix ratio has a moderate amount of PVA powder, and the cost is low. Compared with ordinary rubber concrete, its compressive strength is increased by 20%, and its flexural strength is increased by 15%.

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Abstract

The invention discloses PVA (polyvinyl alcohol) powder modified rubber concrete and a preparation method thereof. The PVA powder modified rubber concrete comprises cement, fine aggregates, coarse aggregates, rubber particles, silica fume, an expanding agent, PVA powder, water and a water reducing agent. The preparation method comprises the following steps: mixing the cement, the fine aggregates, the coarse aggregates, the rubber particles, the silica fume, the expanding agent, the PVA powder, the water and the water reducing agent according to a certain ratio so as to obtain the concrete with apparent density of 2300-2400kg / m<3>. Interfacial properties of the rubber concrete are improved by utilizing the PVA powder, and mechanical properties of highly-doped rubber concrete are improved, so that properties of the highly-doped rubber concrete are improved. Effects of reducing loss of strength, improving toughness, preventing crack and resisting permeation, improving durability and the like can be achieved, so that high-performance concrete is prepared.

Description

technical field [0001] The invention relates to concrete, in particular to a PVA powder modified rubber concrete and a preparation method thereof. Background technique [0002] The rapid development of the automobile industry has made the problems of recycling and disposal of waste tires increasingly prominent. Scrap tires are a kind of solid waste, known as "black pollution". Its recycling and treatment technology has always been a worldwide problem, and it is also a problem in environmental protection. Using waste rubber particles as aggregates in cement concrete materials is a resource-saving and environmentally friendly way to utilize waste rubber, and it provides a new method for solving the inherent brittleness of concrete. Compared with asphalt concrete, rubber concrete has significantly higher rigidity and strength than the former, and has long fatigue life, good water resistance, excellent frost resistance and skid resistance, strong corrosion resistance, and bette...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/20C04B24/26C04B18/22
CPCC04B28/04C04B2111/20C04B2201/20C04B18/22C04B18/146C04B22/142C04B24/2623C04B2103/302C04B14/06C04B14/02Y02W30/91
Inventor 张津瑞韩庆华侯东帅杨友志杨荣伟
Owner TIANJIN UNIV
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