Fly ash cement and preparation method thereof

Abstract

The invention discloses fly ash cement comprising the following components in parts by weight: 30-40 parts of fly ashes, 53-65 parts of portland cement clinkers, 2-5 parts of dihydrate gypsum, 0.5-2 parts of excitants, 1-2 parts of active agents, 1.5-3 parts of early strength agents, 5-10 parts of lime, 6-12 parts of calcium-added slag and 15-25 parts of red mud. The fly ash cement disclosed by the invention can be used for also solving the problems of low early strength and long setting time, and the problem that later strength is still high besides that the fly ash cement has the excellent characteristics that the common flash ash cement is small in pollution, low in hydration heat, good in alkali-aggregate reaction resistance, sulfate corrosion resistance, dry shrinkage resistance, stability and the like, and especially, the excitants disclosed by the invention do not contain the substances such as sulfate, chloridion and the like, so that the latent instability of long-term durability of the cement and the concrete is effectively avoided, and meanwhile, the cost is greatly reduced due to adding of a lot of fly ashes and other slag. The obtained cement is extremely high in compressive strength, exceeds 40MPa after three days, and exceeds 70MPa after 28 days.

Description

technical field [0001] The invention relates to a fly ash cement and a preparation method thereof, belonging to the field of building materials. Background technique [0002] The large-scale and rapid development of my country's infrastructure construction requires a large amount of general-purpose cement, and the characteristics of the cement industry itself, such as high energy consumption, high resource consumption, and high environmental pollution, are facing huge unsustainable challenges and impacts. Manufacture of cement from waste residues as a substitute for natural resources is an effective and feasible way to alleviate or alleviate the contradiction between needs and challenges. The utilization of industrial waste can not only slow down the consumption of natural resources, but also eliminate the environmental pollution caused by the waste itself. [0003] Fly ash is the pulverized coal ash discharged from the pulverized coal boilers of thermal power plants, and it...

AI Technical Summary

Problems solved by technology

If such a large amount of fly ash is not properly treated and utilized, it will not only occupy a large amount of farmland, but also cause groundwater and air pollution, and destroy the ecological balance.