Cementing material and preparation method thereof

Abstract

The invention discloses a cementing material and a preparation method thereof, and belongs to the field of building materials. The cementing material comprises the following components in parts by weight: 50-60 parts of chlorine-containing fly ash, 10-20 parts of blast furnace granulated slag, 10-20 parts of carbide slag, 5-10 parts of desulfurized gypsum and 1-5 parts of an early strength agent. The cementing material disclosed by the invention does not need additional cement, the setting speed is relatively high, the compatibility of the early strength agent and the cementing material is good, the early strength of the cementing material can be improved, and the cementing material does not shrink in the later stage; meanwhile, chloride ions in the fly ash are changed into waste, and the rapid curing effect of the chloride ions is brought into play; the fly ash is excited in a ball milling and chemical excitation combined mode, and the obtained cementing material is better in performance.

Description

technical field [0001] The invention relates to a gelling material and a preparation method thereof, belonging to the field of building materials. Background technique [0002] As a building material, fly ash is widely used in concrete, prefabricated parts, etc. It has the advantages of improving the constructability of concrete, reducing production costs, and improving later strength. However, when fly ash is used as a powder admixture with cement and other cementitious materials, it often has disadvantages such as slow setting speed and low early strength, especially in some fields that pursue early strength, and its use is limited. [0003] At present, the main method to improve the early strength of fly ash cementitious materials is to add cement clinker, or directly use it in conjunction with cement. There is also a method of adding a composite early-strength agent, such as patent CN201510977400.2, a micro-expansion early-strength low-calcium fly ash-based alkali excit...

AI Technical Summary

Problems solved by technology

[0005] When fly ash is used as a powder admixture with cement and other cementitious materials, the setting speed is slow, the early strength is low, and it also has a retarding effect on cement, which limits its application range

Early-strength cementitious materials prepared using fly ash as the main material have large differences in early-strength effects, which are generally divided into two types. One is to directly compound with external cement or cement clinker to achieve early-strength effects; the other One is that the added early strength agents, such as alkali excitation, water glass, etc., stimulate the fly ash too strongly in the early stage, and may cause shrinkage in the later stage; some organic types will change the operability of the cementitious material, Affect construction

Chlorine-containing fly ash needs to be cured by chloride ions to reduce its content because of the corrosion of steel bars or iron utensils by chloride ions, which will result in higher costs

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