Every year, a large number of waste tires are produced in the world, and the problem of disposal of used tires has been continuously exploring. At present, one of the main treatment methods for waste tires is that the waste tire rubber powder production process is becoming more mature. It can be used not only in various rubber and plastic products, rubber and plastics modification, but also in concrete to improve certain process performance of concrete. So what is the use of waste tire rubber powder in concrete?
When using waste tire rubber powder in concrete, the particle shape, surface roughness, fineness of the rubber powder, and the amount of the tire rubber powder all affect the workability of the concrete.
1. Effect of fineness and amount of tire rubber powder on compressive strength and flexural strength of concrete
Under normal circumstances, with the increase in the amount of tire rubber powder, the compressive strength of concrete has decreased, the higher the fineness of the tire rubber powder on the concrete compressive strength of the impact of the smaller; increasing the tire rubber powder dosage, the tire The compression failure mode of concrete modified by rubber powder changes from brittle to elastic. Similarly, the flexural strength of concrete will decrease with the increase of the amount of tire rubber powder, and coarse tire rubber powder will have a greater impact on the flexural strength of concrete.
Compared with concrete that has not been modified by tire rubber powder, the destruction of tire rubber powder concrete is manifested as ductile destruction. The higher the fineness of the blended tire rubber powder is, the better the toughness of the concrete is. Therefore, the tire rubber powder in concrete is best. For products with a fineness of about 40 mesh, the amount of each cubic meter should be greater than 100 liters.
2. Effect of anti-freezing performance of tire rubber powder concrete
The tire rubber powder is a rubber material processed from used tires, and retains the good elasticity and wear resistance of the rubber material. The frost resistance of the concrete modified with the tire rubber powder is significantly improved because the tire rubber powder is used as an elastomer. It provides a certain space for the volume expansion when the liquid freezes inside the concrete. Under the effect of the freeze-thaw cycle, the tire rubber powder can be repeatedly compressed and recovered, weakening the internal stress generated by the expansion, thereby improving the anti-freeze of the concrete. performance.
The application technology of tire rubber powder in concrete is still being explored. Research shows that tire rubber powder can also improve the concrete water retention effect, shock absorption performance, and anti-knock performance. The amount of tire rubber powder in concrete is very large. Using tire rubber powder in concrete can not only improve the technical performance of concrete, but also solve a part of the problem of waste tire disposal, which is a typical use of waste rubber resources.
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