High-performance self-compacting concrete and preparation method thereof

Abstract

The invention relates to high-performance self-compacting concrete and a preparation method thereof. The high-performance self-compacting concrete is prepared from 40 to 90 parts of high belite sulphoaluminate cement, 5 to 40 parts of anhydrous calcium sulphoaluminate clinker, 1 to 15 parts of gypsum, 5 to 15 parts of fly ash, 0.3 to 1.5 parts of water reducing agent, 0.02 to 0.1 part of early strength agent, 0.1 to 5 parts of fiber, 0 to 1 part of retarder, 0.05 to 5 parts of stabilizer, 0.02 to 0.5 part of defoaming agent, 24 to 35 parts of water, 60 to 300 parts of fine aggregate and 80 to 200 parts of coarse aggregate. The material has good self-compacting performance and high volume stability, can be rapidly hardened in a negative temperature environment of-5 DEG C, and is simple and convenient to construct.

Description

technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a high-performance self-compacting concrete and a preparation method thereof. Background technique [0002] Compared with ordinary concrete, self-compacting concrete has good working performance and can be automatically filled and formed. Since it does not require vibration, it is widely used in structures with complex shapes, thin walls and dense reinforcement. At the same time, the concrete pouring time can be greatly reduced. Shortening, the labor intensity of workers can also be significantly reduced, the production efficiency is improved, and the application fields of self-compacting concrete are also increasing. However, self-compacting concrete has high air content (usually large air bubbles), large shrinkage, low strength after hardening, poor durability, and is more prone to breakage, especially in cold climates. [0003] Patent CN 108358562 A disc...

AI Technical Summary

Problems solved by technology

However, self-compacting concrete has a high air content (usually large cells), high shrinkage, low strength after hardening, poor durability, and is more prone to breakage, especially in cold climates

[0003] Patent CN 108358562 A discloses a kind of self-compacting concrete with micro-expansion, high performance and low air content and its preparation method, which consists of Portland cement, fly ash, mineral powder , coarse aggregate, fine aggregate, expansion agent, special admixture, internal curing agent and mixing water. It is especially suitable for the arch rib enlargement project of double-curved arch bridges, but it cannot achieve rapid hardening, and the strength in the middle and late stages is partial Low, the 28-day strength is lower than 50MPa

Patent CN 111704432 A discloses a rapid repair high-performance self-compacting concrete and its preparation method and application. It is made of special cement and ordinary Portland cement. It has the characteristics of super early strength, no shrinkage and high workability. The self-compacting concrete technical index provided by this patent is that the slump expansion is greater than 550mm, the 2h compressive strength is greater than 30MPa, and the 28d compressive strength can reach 60MPa. However, in a low temperature environment, its early strength is low, and it is difficult to meet the requirements of rapid open traffic. , the late strength is not very high

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