Gypsum-based composite lightweight thermal-insulation mortar and preparation method thereof

Abstract

The invention provides gypsum-based composite lightweight thermal-insulation mortar. The mortar comprises, by weight, 60-80 parts of gypsum powder, 1-2 parts of polyphenyl granules, 10-15 parts of glazed hollow beads, 5-10 parts of cement, 1-2 parts of redispersible latex powder, 0.2-0.6 part of a water-retaining agent, 0.2-0.6 part of a gypsum retarder, 0.3-0.8 part of a water reducer, 0.2-0.8 part of polypropylene fiber and 60-80 parts of water. The glazed hollow beads and the polyphenyl granules are mixed by selecting a proper grain composition and then combined with semi-hydrated gypsum, apreparation mode is simple, the consumption of a gel material is reduced, the cost is low, the dry density is reduced, the mortar is high in anti-cracking performance, low in shrinkage deformation, high in ductility and good in construction performance, the self-compactness is good, and the heat preservation performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a gypsum-based composite lightweight thermal insulation mortar and a preparation method thereof. Background technique [0002] The annual discharge of industrial by-product gypsum in my country is more than 100 million tons. Most of the industrial by-product gypsum is piled outside all the year round, occupying a large amount of land and polluting the surrounding environment. Therefore, how to make full use of industrial by-product gypsum has been Become a task of the building materials industry. [0003] With the improvement of people's living standards, air-conditioning and floor heating are widely used indoors. Existing building insulation materials are mostly used for walls, so there is still a considerable amount of heat transmitted through the floor, which increases energy consumption, and the existing floor insulation materials have weak adhesion, ...

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Problems solved by technology

Existing building insulation materials are mostly used for walls, so there is still a considerable amount of heat transmitted through the floor, which increases energy consumption, and the existing floor insulation materials have weak adhesion, low strength, poor insulation performance, and are easy to absorb Moisture expands, and it is easy to shrink and deform after drying, which will cause cracks. The cracks of concrete and cement moisture absorption and expansion will cause problems such as uneven heating of the geothermal heating surface. Large, laying such materials as insulation will greatly increase the load on the ground and floor

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