A kind of waterproof anti-cracking agent for concrete

Abstract

The invention provides a waterproof anti-cracking agent for concrete, which comprises the following raw materials in parts by weight: 30-45 parts of plaster, 3-8 parts of mineral clinker, 20-35 parts of coal gangue, 25-35 parts of pulverized fuel ash and 0.2-0.4 part of complexing agent, wherein the coal gangue comprises one or more of coal-fired slag, mud coal slag, thermal power plant and sulfur fixation ash, and the complexing agent comprises one or more of ethylenediamine tetraacetic acid compound and ethylenediamine tetraacetic acid salt compounds. The invention provides a preparation method of the waterproof anti-cracking agent for concrete, and the preparation method comprises the step of mixing the plaster, mineral clinker, coal gangue, pulverized fuel ash and complexing agent to obtain the waterproof anti-cracking agent for concrete. In the waterproof anti-cracking agent for concrete, the cracking of the concrete due to contraction can be effectively compensated through the interaction of the plaster, mineral clinker, coal gangue and the complexing agent, so that the waterproof anti-cracking agent for concrete has a better anti-cracking effect.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a waterproof and anti-cracking agent for concrete. Background technique [0002] Concrete is one of the most important civil engineering materials in the contemporary era. It has the characteristics of abundant raw materials, low price and simple production process. At the same time, the hardened concrete has the characteristics of high compressive strength, good durability and wide range of strength grades. However, since concrete is a hydraulic material, during its preparation, hardening and use, voids and water loss and shrinkage are often formed inside it, resulting in defects such as poor impermeability and waterproof performance, and many shrinkage cracks. [0003] In order to solve the above-mentioned defects of concrete, a certain amount of functional admixtures are usually added to the concrete, such as waterproofing agent, expansion agent, anti-cracking agent, etc. The...

AI Technical Summary

Problems solved by technology

The expansion component in this type of admixture provided by the prior art is usually the expansion clinker that has been calcined at a high temperature of 1200°C to 1420°C. Calcination of the expansion clinker not only consumes huge energy, but also has a serious impact on environmental quality

[0004] In order to solve the problems of energy consumption and environmental pollution caused by the above-mentioned calcined clinker, aluminum materials and sulfur materials are used as expansion agents in the prior art to compensate for the shrinkage of concrete. The enhanced anti-cracking agent for coal ash materials, in parts by weight, includes 55-70 parts of silicate mineral powder, 15-35 parts of gypsum or chemical waste phosphogypsum, and 10-20 parts of sulfur trioxide-containing Alkali metal substances, in which the content of tricalcium silicate in silicate mineral powder is more than 55%

The activity index of the aluminum material and sulfur material in this anti-cracking agent provided by the prior art is low, and the ability to compensate for shrinkage is limited in the end, so the anti-cracking effect of this anti-cracking agent provided by the prior art is relatively low. Difference

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