High-performance concrete expanding agent

Abstract

The invention discloses a high-performance concrete expanding agent. The expanding agent comprises, by mass, 1-10 parts of high-alumina fly ash, 1-10 parts of calcined kaolin, 1-10 parts of high-alumina mineral slag, 5-10 parts of high-calcium fly ash, 1-10 parts of rice husk ash, 2-10 parts of basalt fibers, 1-5 parts of polypropylene fibers, 3-10 parts of steel slag powder, 1-10 parts of calcium stearate, 7-13 parts of polyvinyl alcohol, 1-10 parts of gypsum and 0.1-2 parts of a retarding and water reducing agent. The expanding agent has the advantages of wide sources of raw materials, low cost, saving of a large amount of high quality bauxite and gypsum, suitable expansion speed, large expansion energy, great changing of the impermeability and the crack resistance of concrete, and low dependence on water curing.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a high-performance concrete expansion agent. Background technique [0002] High-performance concrete is currently a research hotspot in the field of concrete at home and abroad. Due to its excellent performance, high-performance concrete has been more and more widely used, but it is also due to the brittleness and easy shrinkage of high-performance concrete exposed in engineering practice. Concrete is more serious. Ordinary concrete has the characteristics of low strength grade, low early strength, low fluidity, small shrinkage, and less active admixtures. Early expansion agents have low expansion performance, slow expansion rate, small absolute moisture expansion, and expansion The characteristics of long stable period, the combination of ordinary concrete and early expansion agent, its expansion and strength coordination, strong ability to compensate shrinkage, conc...

AI Technical Summary

Problems solved by technology

[0002] High-performance concrete is currently a research hotspot in the field of concrete at home and abroad. Due to its excellent performance, high-performance concrete has been more and more widely used, but it is also due to the brittleness and easy shrinkage of high-performance concrete exposed in engineering practice. Concrete is more serious. Ordinary concrete has the characteristics of low strength grade, low early strength, low fluidity, small shrinkage, and less active admixtures. Early expansion agents have low expansion performance, slow expansion rate, small absolute moisture expansion, and expansion The characteristics of long stable period, the combination of ordinary concrete and early expansion agent, its expansion and strength coordination, strong ability to compensate shrinkage, concrete is not easy to crack, but the current high performance concrete has high strength level, high early strength, high fluidity, large shrinkage, There are many active admixtures, etc. When it is combined with the early expansion agent, the coordination between expansion and strength is poor, the compensation and shrinkage ability is weak, and the concrete is easy to crack. Long-term stable high-performance expansion agent can meet the needs of high-performance concrete