Underfloor heating cushion gypsum based self-leveling mortar with heat insulation performance and preparation method

Abstract

The invention discloses underfloor heating cushion gypsum based self-leveling mortar with heat insulation performance and a preparation method of the self-leveling mortar. The self-leveling mortar comprises the following components in parts by weight: 40 to 50 parts of alpha high-strength gypsum powder, 4 to 8 parts of cement, 0 to 6 parts of coal ash, 6 to 12 parts of a filler, 35 to 45 parts ofan aggregate, 0.2 to 1 part of a foaming agent, 0.1 to 0.2 part of a foam stabilizer, 0.1 to 0.2 part of a water-retaining agent, 0.1 to 0.3 part of a water reducer and 0.03 to 0.07 part of a retarder. The preparation method disclosed by the invention comprises the two steps of preparing the alpha high-strength gypsum powder and preparing the self-leveling mortar. The self-leveling mortar is highin heat insulation performance, can maintain relatively high flowing property and preferable strength performance, meanwhile is free of cracking or shrinkage in later period, and is relatively high involume stability.

Description

technical field [0001] The invention belongs to a building floor material, in particular to a gypsum-based self-leveling mortar for a floor heating cushion with thermal insulation performance. Background technique [0002] Japan began the basic research on gypsum-based self-leveling materials in 1972. By 1979, Japan had more than ten brands of gypsum-based self-leveling materials. In the 1980s, Britain, the United States, France and Russia began the research and development of gypsum-based self-leveling materials. In 2001, German dry-mixed mortar accounted for 16.4% of floor materials. [0003] There are three kinds of common self-leveling floor materials at home and abroad: 1. Cement-based self-leveling materials; 2. Epoxy resin-based self-leveling materials; 3. Gypsum-based self-leveling mortar. Among them, cement-based self-leveling materials and epoxy-based self-leveling materials have been widely used in China. However, due to the large shrinkage of cement-based self-...

AI Technical Summary

Problems solved by technology

The α-type high-strength gypsum powder prepared by desulfurization gypsum generally has good strength performance, but its color is yellow, and it is also yellow after being hydrated and hardened into mortar, and the market acceptance is not high.

For the preparation of α-type high-strength gypsum from phosphogypsum, if the powder treatment is not perfect in the later stage, it will often appear weakly acidic after hydration, which will have an impact on the concrete base.

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