Accelerating agent

Abstract

The invention relates to an accelerating agent prepared by the steps of preparing 35wt% of bauxite, 24wt% of sodium carbonate, 30wt% of limestone and 11wt% of coal into raw materials; grinding into powder; calcining into alumina clinker in a high temperature furnace section of 1250 DEG C; grinding the alumina clinker into powder, wherein the fineness is less than 15%; and uniformly stirring 40 to 60wt% of alumina clinker powder and 40 to 60wt% of coal ash. The coal ash is prepared by calcining coal gangue through a fluidized bed boiler, the active constituents of volcanic ash in the coal ash are much, and the content of Al2O3 reaches 27.39% (while the content of alunite is about 20%), so that the coagulation time is further shortened and the later strength of concrete is guaranteed under the active action of the volcanic ash. The accelerating agent has the advantages that wastes are changed into beneficial materials by utilizing the coal ash in power plants; the pollution of the coal ash to the environment is reduced; the alunite requiring high temperature calcining is simultaneously omitted; the electric energy is saved; the production cost is reduced; and the later strength of the concrete is guaranteed.

Description

technical field [0001] The invention relates to a concrete quick-setting agent, in particular to a novel high-strength quick-setting agent used in the construction of mines, tunnels, subways and the like. Background technique [0002] The known quick-setting agent for concrete is made by adding alumina clinker to high-temperature calcined alum stone, alum mud, gypsum and other mixed materials, which leads to low strength of concrete in the later stage and high rebound rate, which cannot be suitable for construction. Process requirements, can not guarantee the quality of the project. Simultaneously because need high temperature to calcinate alunite, increase power consumption, cause the production cost of product higher. Contents of the invention [0003] The object of the present invention is to provide a quick-setting agent produced by using the fly ash of the power plant, which greatly reduces the production cost and ensures the improvement of the project quality. [0...

AI Technical Summary

Problems solved by technology

[0002] The known quick-setting agent for concrete is made by adding alumina clinker to high-temperature calcined alum stone, alum mud, gypsum and other mixed materials, which leads to low strength of concrete in the later stage and high rebound rate, which ca...