High performance concrete expanding agent

Abstract

The invention which relates to a high performance concrete expanding agent belongs to the technical field of expansive cement. The high performance concrete expanding agent is characterized in that the high performance concrete expanding agent comprises, by weight, 40-60 parts of waterless calcium sulfoaluminate, 20-40 parts of calcium sulfate and 10-25 parts of calcium oxide. The high performance concrete expanding agent has the advantages of high expansion energy, good stability, safety and reliability, simple preparation process, low production cost, excellent product performance and the like. The expansion rate of the high performance concrete expanding agent is in harmony with the strength development of concrete, so the expansion rate is fast, the expansion stabilization phase is early, and the expanding agent has good anti-crack anti-seepage functions, thereby the expanding agent is an ideal material for preparing high performance expansive concrete.

Description

technical field [0001] The invention belongs to the technical field of expansive cement, in particular to a high-performance concrete expansive agent. Background technique [0002] At present, most of the existing expansion agents are prepared from calcined kaolin, high-alumina coal gangue, alunite, anhydrous calcium sulfoaluminate or calcium aluminate clinker and gypsum, which have the problems of slow expansion rate and low expansion energy. Since modern concrete has the characteristics of high early strength, high brittleness, and poor stress relaxation ability, there is a contradiction between expansion and strength development, resulting in insufficient ability to compensate for shrinkage. Moreover, the production process control requirements of the expansion agent are very strict, the cost is high, the material price is high, there are technical problems such as difficulties in industrial production, and the inability to meet the needs of preparing high-quality shrinka...

AI Technical Summary

Problems solved by technology

Because modern concrete has the characteristics of high early strength, high brittleness, and poor stress relaxation ability, there is a contradiction between expansion and strength development, resulting in insufficient ability to compensate shrinkage

Moreover, the production process control requirements of the expansion agent are very strict, the cost is high, the material price is high, there are technical problems such as difficulties in industrial production, and the inability to meet the needs of preparing high-quality shrinkage-compensating concrete.