High-strength self-compacting concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and particularly discloses high-strength self-compacting concrete and a preparation method thereof. The concrete is prepared from the following raw materials, by weight: cement, coal ash, mineral powder, fine aggregate, coarse aggregate, a water reducing agent, an expanding agent, water, diatomite and modified sepiolite powder. The invention also discloses a preparation method of the concrete. The method comprises the following steps: mixing the coarse aggregate and fine aggregate, adding the diatomite and modified sepiolite powder, anduniformly performing mixing to obtain a first mixture; mixing cement, fly ash and mineral powder to obtain a second mixture; mixing the water reducing agent, the water and the expanding agent to obtain an admixture solution, and stirring and mixing the admixture solution, the first mixture and the second mixture. Therefore, the obtained self-compacting concrete has excellent strength and self-compacting performance, the self-shrinking performance is improved, and the cracking possibility caused by self-shrinking is reduced.

Description

technical field [0001] The application relates to the technical field of concrete, more specifically, it relates to a high-strength self-compacting concrete and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the national economy and construction technology, more and more large-scale and technically difficult construction projects have emerged. In these projects, a large number of complex steel-concrete composite structures are used, such as multi-cavity box-shaped externally or internally poured concrete, multi-cavity box-shaped both externally and internally poured concrete, and steel pipe laminated columns with the appearance of fair-faced concrete, etc. Such complex steel-concrete composite structural columns put forward stricter requirements on the working performance of concrete. High-strength self-compacting concrete has been widely used because of its excellent workability. However, due to the high self-shr...

AI Technical Summary

Problems solved by technology

However, due to the high self-shrinkage of high-strength concrete, it is easier to crack than ordinary-strength concrete, which limits the application of high-strength self-compacting concrete.