Magnesium high-performance anti-cracking agent for concrete as well as preparation method and application thereof

Abstract

The invention discloses a magnesium high-performance anti-cracking agent for concrete as well as a preparation method and application thereof. The magnesium high-performance anti-cracking agent is prepared from the following raw materials of: 50 to 63 weight percent of light calcined magnesia clinker, 21 to 34 weight percent of phosphorus slag, 5 to 10 weight percent of coal slag, 1 to 3 weight percent of quartz sand, 1 to 2 weight percent of early strength agent and 0.5 to 1.3 weight percent of novel hydration heat absorbent. The light calcined magnesia clinker is formed by calcining magnesite, an iron material and bauxite at high temperature. The preparation method of the novel hydration heat absorbent comprises the following steps of: mixing maleic anhydride and sodium thiocyanate in a molar ratio of (7-9): 1; adding water to form a solution; dropwise adding a sodium benzenesulfonate solution in a nitrogen atmosphere; heating to 55-65 DEG C, carrying out heat preservation reaction for 2 hours; and cooling and drying to obtain the novel hydration heat absorbent. The anti-cracking agent disclosed by the invention has the functions of compensating concrete shrinkage, enhancing the mechanical property of concrete and absorbing cement hydration heat, and fundamentally improves the anti-cracking performance of the concrete material.

Description

technical field

[0001] The invention belongs to the field of concrete admixtures, and in particular relates to a magnesium high-performance anti-cracking agent for concrete, a preparation method and application thereof. Background technique

[0002] Concrete cracks have always been a problem in the field of construction engineering. Because it reduces the durability of concrete and endangers engineering structures, it has always troubled the design, construction and material research and development personnel. How to effectively solve concrete cracks, we must first understand the types and causes of concrete cracks. Cracks caused by temperature changes and shrinkage cracks are two major types of cracks related to concrete performance. Shrinkage cracks can be divided into plastic shrinkage cracks, drying shrinkage cracks, autogenous shrinkage cracks, carbonization shrinkage cracks, etc. Cracks caused by temperature changes are cement shrinkage cracks. When the cementitious ma...

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