Self-compacting concrete and preparation method thereof

Abstract

The invention provides a self-compacting concrete and a preparation method thereof. The concrete is composed of a dry mixing base stock and water, wherein the dry mixing base stock is composed of 250-500 parts of cement, 300-450 parts of gravel, 600-700 parts of sand, 238-475 parts of superfine slag powder, 120-240 parts of fly ash and 0.8-3 parts of a water reducing agent; the weight ratio of water and dry mixing base stock is 0.95-0.156. The preparation method is as follows: adding the cement, gravel, sand, superfine slag powder, fly ash and water reducing agent into a large-scale forced mixer, stirring for 30 min, then adding the gravel, stirring for 50 min to prepare the dry mixing base stock for standby; and mixing water and prepared dry mixing base stock according to ratio to prepare the self-compacting concrete, and stirring for no less than 120 min. The invention has the advantages of good filling, gap trafficability, segregation resistance and stability, and the preparation is more environment-friendly, and reduces the cost of concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete refers to the concrete that can flow and compact under its own gravity, and can completely fill the formwork even if there are dense steel bars, and at the same time obtain good homogeneity and do not require additional vibration. At present, the research and application of self-compacting concrete in China is still in its infancy. It is mainly used for the reinforcement and transformation of building structures and projects with special requirements for concrete. Most of the existing self-compacting concrete is mixed in factories and then transported by special transport vehicles. To the construction site, pumping pouring is used for pouring, but traditional self-compacting concrete is made of natural coarse and fine aggregate materials, which is not onl...

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Problems solved by technology

At present, the research and application of self-compacting concrete in China is still in its infancy. It is mainly used for the reinforcement and transformation of building structures and projects with special requirements for concrete. Most of the existing self-compacting concrete is mixed in factories and then transported by special transport vehicles. To the construction site, pumping pouring is used for pouring, but traditional self-compacting concrete is made of natural coarse and fine aggregate materials, which is not only costly, but also not conducive to environmental protection. With the increase of super high-rise buildings, more than 1000 The high-rise buildings with a height of more than 10 meters are already within the scope of planning permission, which increases the difficulty of construction. There is an urgent need for a construction method that can be mixed in the factory and transported to the construction site by a transport vehicle according to the construction requirements, and can also be directly poured by on-site mixing. Mode of construction, self-compacting concrete with no restrictions on the material used

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