Compound concrete expanding 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 and belongs to the technical field of building material concrete admixtures. 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 problem of concrete shrinkage and cracking has become a research hotspot. This is because in the initial stage of cement hardening, water loss and changes in temperature and humidity can easily cause volume shrinkage. When the shrinkage is limited, the tensile stress generated exceeds the concrete itself. At the time of tensile strength, cement concrete is prone to cracking; at the same time, the load-bearing capacity of the cracked concrete is drastically reduced; in addition, the infiltration of water will further deteriorate the durability of the concrete, causing corrosion of steel b...

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