Cement mixed material containing coal ash and method for preparing cement mixed material

Abstract

The invention discloses a cement mixed material containing coal ash and a method for preparing the cement mixed material. The cement mixed material is formed by means of hybrid reaction of raw materials including, by weight, from 70 to 90 parts of the coal ash, from 5 to 20 parts of plaster stone, from 3 to 5 parts of zeolite, from 0.2 to 3 parts of potassium sulfate, from 2 to 4 parts of calcium carbonate, from 0.05 to 0.07 part of triethanolamine, from 1 to 2 parts of calcium chloride, from 1 to 3 parts of potassium nitride, from 0.5 to 3 parts of polymerized aluminum ferrum chloride and from 0.5 to 3.0 parts of anhydrous sodium metasilicate. The method includes weighing the raw materials according to a formula; realizing ball-milling of the raw materials to form pulp; and then drying the pulp. The cement mixed material containing the coal ash has the advantages of high activity, dosage and early strength, wide material sources and fine peaceability and frozen penetration resistance.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a cement mixture containing fly ash and a preparation method thereof. Background technique [0002] Fly ash is a large amount of industrial waste, and its treatment and comprehensive utilization have attracted much attention from all over the world. The commonly used method in our country is to use undisturbed fly ash or finely ground fly ash as cement admixture and concrete admixture, brick and block. The use of fly ash as a mixture of cement and admixture of concrete has been standardized in my country and corresponding technical specifications have been formulated. But at present, it is better to use sorted dry-discharged high-grade ash and first-grade ash, and the utilization rate of a large amount of wet-discharged ash and low-grade ash is still low. There are many research methods for the excitation and activation of fly ash, mainly mechanical grinding method, lime alkal...

AI Technical Summary

Problems solved by technology

At present, a lot of compound excitation is used, that is, lime, gypsum, sodium sulfate and fly ash are mixed and dry-milled. Although the early strength has been improved, the activity is not high, and the dosage is low, not higher than 30%, and the effect is not ideal. Poor stability, high-temperature excitation and evaporation with lime alkali have not been widely used due to high cost, large investment, and complicated process