High-strength crack-resistant concrete material

Abstract

The invention discloses a high-strength crack-resistant concrete material. The high-strength crack-resistant concrete material is prepared from, by weight, 4 to 6% of water, 11 to 14% of P.II52.5 cement, 24 to 34% of river sand, 30 to 40% of coarse aggregate cobblestone, 2 to 5% of fly ash, 1 to 3% of ore powder, 2 to 4% of silicon powder, 1 to 4% of water-absorbing ceramsite and 0 to 1% of a compound additive through stirring, mixing, hydration and coagulation. With the high-strength crack-resistant concrete material, high strength, high elastic modulus and good construction performance of concrete can be maintained, the problem of early-stage cracking of concrete is overcome, and production difficulty and construction process difficulty are not increased.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to a high-strength crack-resistant concrete material. Background technique [0002] Concrete is an essential and important material in building construction. It has the advantages of wide application environment, sufficient raw materials, simple process, and good fire resistance. However, it is a brittle material, especially in infrastructure construction, roads, bridges and other High-strength concrete, which is widely used in structural engineering, is prone to defects such as micro-cracks after pouring of high-strength concrete obtained according to conventional components and proportions. This is because, with the increase of concrete strength, the water-cement ratio continues to decrease, resulting in increased shrinkage of the concrete material; at the same time, the amount of cementitious material in the material mix ratio increases significantly, and the hydration te...

AI Technical Summary

Problems solved by technology

Research by Hu Shuguang et al. also shows that the addition of 0.5% pre-absorbent superabsorbent resin has little effect on the 7d strength of concrete, but the 28d strength drops significantly.

This is mainly because: after the superabsorbent resin releases water, it leaves honeycomb holes in the concrete, which reduces the effective cross-sectional area of ​​the specimen. When the specimen is under pressure, it is easy to cause stress concentration at the hole, which promotes the formation of microcracks. generation and development, which reduces the concrete strength

[0008] Recently, some researchers have also tried to alleviate the early cracking of concrete by adding porous ceramsite, such as Han Yudong et al. Journal of the Chinese Academy of Sciences, 2013 (41): 1070-1078) used pre-absorbed ceramsite to improve the early shrinkage performance of concrete with a benchmark water-cement ratio of 0.33. This study adopted technical measures to reduce the water-cement ratio while using porous ceramsite. The mechanical properties are guaranteed, but the elastic modulus of concrete still drops as high as 19%

If this material is used in engineering, it will seriously reduce the stiffness of structural members and have an adverse effect on the structure.

Images