Cement-free desulfurized gypsum plastering mortar and preparation method thereof

Abstract

The invention provides a cement-free desulfurized gypsum plastering mortar and a preparation method thereof. The cement-free desulfurized gypsum plastering mortar comprises the following components in parts by weight: 15-20 parts of desulfurized gypsum, 15-20 parts of silicon-calcium slag composite admixture, 60-70 parts of aggregate, 0.2-0.3 part of additive and 10-15 parts of water. The silicon-calcium slag composite admixture is composed of the following components in parts by weight: 40-50 parts of silicon-calcium slag, 1-5 parts of desulfurized gypsum, 30-35 parts of fly ash, 15-25 parts of granulated blast-furnace cinder and 0.05-0.08 part of grinding aid. The cement-free desulfurized gypsum plastering mortar is free of any cement and directly adopts the desulfurized gypsum, silicon-calcium slag and other industrial solid wastes as the basic components, so that the prepared cement-free desulfurized gypsum plastering mortar can satisfy requirements in related standards, and does not need to perform drying, calcination, milling and other processes on the desulfurized gypsum, thereby lowering the energy consumption and pollution in the desulfurized gypsum plastering mortar working process.

Description

technical field [0001] The invention relates to a cement-free desulfurized gypsum plastering mortar and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] Plastering mortar is the most used type of mortar in construction mortar, the purpose is to protect the base layer of the wall and increase the aesthetic effect. At present, there are mainly two types of plastering mortars: cement plastering mortar and gypsum plastering mortar. Among them, gypsum plastering mortar (gypsum plastering mortar) is based on hemihydrate gypsum (its main component is CaSO 4 1 / 2H 2 O) or type II anhydrous gypsum is used alone or mixed as a cementitious material, and is prepared by adding aggregate, water and various admixtures in a certain proportion. In recent years, the use of gypsum plastering mortar has gradually increased, and the combination with mechanized spraying construction has a prominent cost advantage. [0003] Sinc...

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Problems solved by technology

However, research has found that the moisture of the plastering mortar prepared by the above method takes a long time to volatilize, and the hardening process is very slow, which brings great inconvenience to production and construction; The strength and waterproof performance of cement plastering mortar are reduced, and even fail to meet the requirements of relevant industry standards and national standards, so it is usually used to add cement and materials that can improve the overall performance of calcined desulfurized gypsum plastering mortar, such as Chinese patent applications CN201410365697.2 discloses a kind of construction dry-mixed plastering mortar, which uses a relatively small amount of desulfurized gypsum powder (2-5wt%) and a relatively large amount of Portland cement (20-30wt%), and also adds Polypropylene fibers, a variety of additives, and 5-10wt% performance improvers are used to compensate for the performance degradation caused by adding desulfurized gypsum

Among them, the amount of performance improver is relatively large, even exceeding the amount of desulfurized gypsum. Because the price of the admixture is relatively expensive, the cost of raw materials for plastering mortar is increased, which is not conducive to actual production and promotion.

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