Composite cement with large amount of coal gangue and its preparation method

Abstract

The invention discloses a large mixing amount coal gangue composite cement comprising coal gangue, silicate cement clinker aggregate, exciting agent, gypsum coagulation regulating agent, mineral admixture by right weight portion through a finite process, wherein the content of coal gangue is 20-80% wt. The composite cement according to the invention can be used for making various concrete structure, in particular mass concrete structure.

Description

technical field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a composite cement prepared by using coal gangue industrial waste residue and a preparation method thereof. Background technique

[0002] my country's annual cement output has reached 800 million tons, of which about 600 million tons of high-temperature fired cement clinker, by 2010 my country's annual cement demand will exceed 1 billion tons. Cement production consumes a lot of resources and energy and seriously pollutes the environment. The performance of cement in our country is on the low side, resulting in a further increase in consumption. Social development requires cement to have better constructability, lower heat of hydration, higher strength, more stable volume, better corrosion resistance and durability. In addition, my country discharges more than 800 million tons of various solid industrial wastes every year, piling up like mountains, causin...