Cement-based steel slag sand mending material used for mending buildings

Abstract

The invention provides a cement-based steel slag sand mending material used for mending buildings. Raw materials for the mending material comprise, by weight, 50 to 78% of steel slag sand with a particle size of no more than 4.75 mm and 22 to 50% of silicate cement. According to the invention, steel slag can be used to fully replace river sand, and the mending material prepared from the steel slag has better tensile bond strength than that of a mending material prepared from natural river sand. When a plurality of auxiliary materials are properly added, the mending material better presents the advantages of high bond strength, good flexibility, appropriate anti-compression and flexural strength, a low ratio of compressive strength to flexural strength, good wear resistance, good crack resistance, a small drying shrinkage value and good compatibility with a cement concrete material. According to the invention, the raw materials are widely available and cheap, and industrial waste, i.e., steel slag, is fully utilized; a product obtained after uniform mixing of the raw materials in proportion has stable quality and is simple to construct and operate on site; after mixed with water, the mending material provided by the invention has good workability and water retention performance and is nonhazardous, pollutionless, green, environment-friendly and energy saving mending mortar for buildings.

Description

technical field [0001] The invention relates to a construction material, which specifically belongs to the steel slag sand repair mortar used for damaged cement concrete buildings or structures, and is mainly used for repairing cement concrete buildings and structures. Background technique [0002] At present, my country's iron and steel industry is developing rapidly. With the increase of steel production, the amount of steel slag has also increased significantly. The discharge of a large amount of waste not only causes waste of resources, but also occupies land and pollutes the environment, seriously restricting economic development. Therefore, how to efficiently utilize steel slag, which not only brings economic benefits, but also protects the environment, has become a key direction for the current recycling of steel slag. If steel slag is used as fine aggregate in the field of dry-mixed mortar, it can not only reduce the cost of dry-mixed mortar, but also benefit the hig...

AI Technical Summary

Problems solved by technology

At the same time, the expansion components of commonly used repair mortars generally use chemical expansion agents, which not only invisibly increases the cost of repair mortars, but also pollutes the environment

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