Low-shrinkage crack self-compacting concrete

Abstract

The invention discloses low-shrinkage crack self-compacting concrete which is prepared from cement, gravels, sand, a mineral admixture and an anti-shrinkage crack compound additive. By adopting the low-shrinkage crack self-compacting concrete disclosed by the invention, on the basis of overcoming the defects of bleeding, segregation, poor viscosity and great gradual loss of self-compacting concrete, the early shrinkage crack of the self-compacting concrete after hardening is greatly reduced so as to guarantee good durability and volume stability of the self-compacting concrete to satisfy the practical construction application of large-area engineering and the like; and moreover, the cement is saved at least by 40kg / m<3> through proportion optimization on the basis of meeting the requirements of fundamental norms for materials.

Description

technical field [0001] The invention relates to building materials, in particular to a low-shrinkage cracking self-compacting concrete. Background technique [0002] Due to the diversity of concrete constituent materials and structural complexity, concrete cracking has become an unavoidable problem in concrete engineering. Especially in order to adapt to the development of modern concrete technology, self-compacting concrete is widely used due to its characteristics of vibration-free self-leveling, but self-compacting concrete is widely used due to its low water-cement ratio, large amount of cementitious materials and various external The incorporation of additives makes the shrinkage cracking more significant. With the generation of cracks, the durability of self-compacting concrete is becoming more and more prominent. Therefore, improving the shrinkage and cracking of self-compacting concrete has become a major topic of modern concrete technology. [0003] For the concret...

AI Technical Summary

Problems solved by technology

Especially in order to adapt to the development of modern concrete technology, self-compacting concrete is widely used due to its characteristics of vibration-free self-leveling, but self-compacting concrete is widely used due to its low water-cement ratio, large amount of cementitious materials and various external The incorporation of additives makes the shrinkage and cracking more significant. With the generation of cracks, the durability of self-compacting concrete is becoming more and more prominent. Therefore, improving the shrinkage and cracking of self-compacting concrete has become a major topic of modern concrete technology.

[0003] For the concrete shrinkage cracking problem, most of the current researches are concentrated in the laboratory conditions, which is too different from the actual construction conditions, so it is difficult to achieve the ideal effect in the actual construction application of the partial compensation shrinkage technology, and the anti-cracking effect is poor, especially This is especially true for expansion agents that are more dependent on the environment

In addition, as the fifth and sixth components of self-compacting concrete, the composite addition of mineral admixtures and chemical admixtures makes the problem of shrinkage and cracking of self-compacting concrete more serious. Improper remixing not only fails to meet the desired performance requirements, but also It is easy to cause other performance deterioration of self-compacting concrete

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