High-volume fly ash cement and preparation method thereof

Abstract

The invention relates to the field of building materials, and particularly discloses high-volume fly ash cement and a preparation method thereof. The high-volume fly ash cement is prepared from the following components in parts by weight: 5 to 20 parts of Portland cement clinker, 50 to 70 parts of fly ash, 5 to 10 parts of limestone powder, 1 to 8 parts of a thickening time control agent, 0.01 to0.15 part of an additive and 10 to 20 parts of mineral powder, wherein the additive is composed of polyglutamic acid and aluminum potassium sulfate dodecahydrate according to the weight ratio of (1-10): 1, and the thickening time control agent is composed of fluorgypsum and desulfurized gypsum according to the weight ratio of (1-4): (1-8). The preparation method comprises the following steps of: grinding the raw materials according to the formula ratio, and uniformly mixing. The product provided by the invention has the advantages that a large amount of fly ash can be doped under the conditionof maintaining relatively high early strength, and the utilization rate of the fly ash is improved.

Description

technical field [0001] The application relates to the field of building materials, more specifically, it relates to a large-volume fly ash cement and a preparation method thereof. Background technique [0002] Fly ash is a kind of ash obtained when power plants burn pulverized coal, also known as fly ash. The output of fly ash in the world is large, but the utilization rate is not high, causing environmental pollution and waste of resources. As a cement admixture, fly ash has a history in our country. On the one hand, it can turn waste into treasure and turn harm into profit. On the other hand, it can alleviate the contradiction of the shortage of slag resources and promote the healthy development of the cement industry. [0003] For example, the Chinese invention patent application with the publication number CN102092973A discloses a fly ash cement and a preparation method thereof, wherein the weight ratio of the fly ash content is 30%-40%, and the prepared fly ash cement h...

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Problems solved by technology

[0004] On the one hand, the current annual output of fly ash in my country is greater than 600 million tons, and the utilization rate of fly ash is about 40wt%, so there is a problem of excess fly ash resources; on the other hand, due to the dense and stable structure of fly ash , small internal specific surface area, small adsorption capacity for water, and difficult hydration. When the amount of fly ash in cement is too large, the early strength of cement decreases, which limits the further development of the content of fly ash in the cement of the aforementioned related technology. improve

[0005] In view of the above-mentioned related technologies, the inventor believes that there is a surplus of fly ash resources, and the defect that the utilization rate of fly ash in fly ash cement is low

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