High-performance anti-freezing concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and particularly discloses high-performance anti-freezing concrete, which is prepared from the following raw materials in parts by weight: cement, water, mineral powder, gravel, sand, fly ash, a water reducing agent, magnesium lithium silicate, polypropylene fibers and polyvinylidene chloride copolymer emulsion. The preparation method comprises the following steps: preparing a water glue dispersion liquid A: mixing and stirring 2 / 5 of water in the raw materials and magnesium lithium silicate; preparing a mixture: stirring cement, mineral powder, gravel, sand and fly ash, then adding polypropylene fiber, stirring, adding a water reducing agent and 2 / 5 of water, and stirring to obtain the mixture; and preparing concrete: adding the water glue dispersion liquid A and the residual water into the mixture, stirring, finally adding polyvinylidene chloride copolymer emulsion, and stirring to obtain the concrete. According to the invention, the anti-freezing performance of the concrete is specifically improved while the strength is not reduced, and even the compressive strength can be further improved.

Description

technical field [0001] The application relates to the technical field of concrete, more specifically, it relates to a high-performance frost-resistant concrete and a preparation method thereof. Background technique [0002] Concrete structures in northern my country are in a freeze-thaw environment. In this environment, the internal and external stress of conventional concrete increases due to inconsistent internal and external shrinkage, and cracks are prone to occur. [0003] In order to improve the antifreeze performance of concrete, air-entraining agents are usually added. Air-entraining agents can introduce a large number of uniformly distributed, stable and closed micro-bubbles into the concrete during the mixing process. These micro-bubbles can accommodate the migration of free water and ease The water pressure during freezing can significantly improve the ability of concrete to withstand repeated freezing and thawing, but when the air content of concrete increases by...

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Problems solved by technology

[0003] In order to improve the antifreeze performance of concrete, air-entraining agents are usually added. Air-entraining agents can introduce a large number of uniformly distributed, stable and closed micro-bubbles into the concrete during the mixing process. These micro-bubbles can accommodate the migration of free water and ease The water pressure during freezing can significantly improve the ability of concrete to withstand repeated freezing and thawing, but when the air content of concrete increases by 1%, the compressive strength will decrease by about 5%. With a certain amount of air, the drying shrinkage will also increase, and various forms of shrinkage are important reasons for concrete cracking, and cracking problems will occur in the later stage of concrete

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