Composite admixture for improving durability of common concrete by improving grading

Abstract

The invention belongs to the technical field of building materials, and discloses a composite admixture for improving the durability of common concrete by improving grading. The composite admixture for improving the durability of common concrete by improving grading is composed of the components in parts by mass: 25 to 30 parts of volcanic rock powder, 10 to 15 parts of steel slag, 10 to 15 parts of fly ash, 10 to 15 parts of desulfurized gypsum powder, 8 to 10 parts of carbon fiber, 8 to 12 parts of modified phenolic resin and 5 to 8 parts of activated aluminosilicate mineral. Through cooperation of the fly ash, the volcanic rock powder and the steel slag, proper fluidity can be provided for the concrete, the porosity is reduced, the compactness of a system can be improved, the use amount of water can be reduced, and the durability of the concrete is further improved. The carbon fibers, the modified phenolic resin, the fly ash, the volcanic rock powder and the steel slag are added and blended, so that the pore structure of the concrete is improved, the compactness of the concrete is improved, and the durability of the concrete is improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a composite admixture for improving the durability of ordinary concrete through improved gradation. Background technique [0002] At present: Composite admixture refers to the use of two or more mineral materials that are separately ground to a specified fineness and then mixed in a certain proportion or after mixing two or more mineral materials in a certain proportion. Then grind to the specified fineness powder material. The interaction of cementitious materials in the mixing process produces effects such as induced activation, surface microcrystallization and interface coupling, so that the added composite mineral admixture can effectively improve the workability of concrete and the compactness, strength and durability of hardened concrete sex. However, due to the lack of systematic theoretical guidance on the preparation and application of mineral ad...

AI Technical Summary

Problems solved by technology

However, because the current research on mineral admixtures is not deep enough and comprehensive enough, and there is a lack of systematic theoretical guidance on the preparation and application of mineral admixtures, there are still many problems in their practical applications.

[0003] Through the above analysis, the existing problems and defects of the prior art are: the existing composite admixtures cannot effectively improve the workability of the concrete and the compactness, strength and durability of the hardened concrete

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