Composite concrete expansion agent

Abstract

The invention discloses a compound concrete expanding agent. The compound concrete expanding agent is prepared by using the following components in parts by weight: 15 to 20 parts of calcium aluminosilicate, 25 to 30 parts of calcium sulphoaluminate, 20 to 30 parts of sulfur fixation waste residue, 10 to 20 parts of red mud, 10 to 15 parts of lithium slag, 4 to 8 parts of modified calcium oxide, 3 to 6 parts of magnesium oxide, 5 to 8 parts of methyl sodium silicate, 0.1 to 0.3 part of azodicarbonamide, 0.4 to 0.7 part of sodium tripolyphosphate, 2 to 4 parts of lauryl sodium sulfate, 0.3 to 0.6 part of ethylene-acrylic acid copolymer, 0.7 to 0.9 part of polycarboxylate superplasticizer and 0.5 to 0.7 part of nano calcium carbonate. The compound concrete expanding agent has the advantages of high strength, good compensation capability, calcium oxide reaction regulation and the like, and is a concrete additive which has a great development prospect.

Description

technical field [0001] The invention relates to a composite concrete expansion agent, which belongs to the technical field of concrete admixtures for building materials. Background technique [0002] Concrete is the most widely used building material. With the development of science and technology, it is constantly being studied in depth, and its performance is improved and developed. In recent years, the shrinkage and cracking of concrete has become a research hotspot. This is because in the early stage of cement setting and hardening, water loss and changes in temperature and humidity are likely to cause volume shrinkage, and the tensile stress generated when the shrinkage is limited exceeds the concrete itself. When the tensile strength is high, cement concrete is prone to cracking; at the same time, the bearing capacity of the cracked concrete decreases sharply; moreover, the infiltration of water will further deteriorate the durability of concrete, resulting in corrosio...

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Problems solved by technology

Although it can obtain a certain strength and the ability to compensate for shrinkage, it is still unsatisfactory

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