Preparation method of high-performance composite gypsum cementing slurry

Abstract

A preparation method of high-performance composite gypsum cementing slurry belongs to the technical field of building materials. The composite gypsum cementing slurry comprises the components of one of building gypsum powder, coal ash or slag powder, a mixed powder comprising cementing, a water reducer and water as well as the components of an exciting agent formed by mixing a retarder and a sulphate, wherein the water, the water reducer and the exciting agent are proportionally weighed out according to the total mass of the mixed powder, and then poured into a stirring container, and uniformly stirred to obtain a mixed solution, the mixed powder are blended into the stirring container filled with the mixed solution in a stirring state, the mixed powder and the mixed solution are stirred into a slurry at a high speed after being blended so as to obtain the composite gypsum cementing slurry. The composite gypsum cementing slurry has the advantages of excellent pouring performance, adjustable settling time and high compressive strength. The preparation method can be used for producing building material products with different sizes and performances.

Description

technical field [0001] The invention relates to a composite gypsum cementing slurry and a manufacturing method thereof. It belongs to the technical field of building materials. Background technique [0002] Building gypsum refers to calcium sulfate dihydrate (CaSO 4 2H 2 O) prepared by dehydration, with β-calcium sulfate hemihydrate (β-CaSO 4 1 / 2H 2 O) Powdered gelling material as the main component. Natural gypsum, phosphogypsum, and desulfurized gypsum are three types of gypsum that are currently widely used in construction. [0003] The treatment and utilization of fly ash, slag, phosphogypsum and desulfurized gypsum solid waste have long been concerned by countries all over the world, and the cumulative stockpiles in my country alone have exceeded 500 million tons. At present, the composite gypsum cementing materials used in industrial production are mainly made of dihydrate gypsum, fly ash, slag, lime, phosphorus slag, etc. For example, in the Chinese journal "Br...

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Problems solved by technology

The journal "Nonmetallic Minerals" Issue 2, 2008 "Research on the Modification and Mechanism of Building Gypsum by Mineral Admixtures" introduced the composite gypsum cementitious material prepared with building gypsum, fly ash, mineral powder, cement, etc. as the main materials. , although it has good pouring performance, but the setting time is not adjustable; the compressive strength is low, so it cannot meet the needs of many occasions

In addition, previous studies believed that the amount of cement in gypsum should not be too large, such as "slag powder and cement modified gypsum cementitious material" introduced in "Gypsum Building Materials" published by China Building Materials Industry Press in 2012 on page 296. The large amount of cement will lead to too high alkalinity, which is not good for the strength of gypsum

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