Sand-free desulfurized gypsum self-leveling mortar and preparation method thereof

Abstract

The invention relates to sand-free desulfurized gypsum self-leveling mortar which comprises the following components in parts by weight: 450-500 parts of gypsum powder, 20-80 parts of cement, 20-70 parts of fly ash, 20-80 parts of mineral powder, 5-9 parts of rubber powder, 2-6 parts of a defoaming agent, 0.5-1.5 parts of a gypsum retarder, 0.5-1.5 parts of a water reducing agent and 200-260 partsof water. According to the mortar, flue gas desulfurization gypsum is adopted to replace natural gypsum, energy consumption is low, the utilization rate of desulfurization gypsum is increased, meanwhile, natural sand does not need to be added, and the problem of environmental damage caused by excessive use of sand is avoided. The sand-free desulfurized gypsum self-leveling mortar is high in strength and fluidity, the strength, the setting time and the fluidity of the mortar meet the requirements of JCT1023-2007 gypsum-based self-leveling mortar, and the sand-free desulfurized gypsum self-leveling mortar has the characteristics of stable quality, simplicity in construction and the like, conforms to the national industrial policies of energy conservation, emission reduction and environmental protection, and is beneficial to popularization and application.

Description

technical field [0001] The invention relates to a sand-free desulfurized gypsum self-leveling mortar and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] In recent years, my country's environmental problems have attracted more and more people's attention, and ecological and environmental protection problems must be effectively resolved while economic development is in progress. This requires enterprises to balance the current production capacity, and at the same time urgently need to upgrade the technical equipment industry to reduce the generation of "three wastes" and develop the utilization process of industrial by-products. [0003] Desulfurization gypsum is the main by-product of limestone-gypsum wet flue gas desulfurization process in coal-fired power plants, which is formed by the reaction of absorbent and sulfur dioxide in flue gas. , low in alkali, non-radioactive, and less harmful impurities, it ca...

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Problems solved by technology

[0006] The Chinese patent with the application number 202010698520.X discloses a sand-free gypsum-based self-leveling mortar and its preparation method. It is made of hemihydrate phosphogypsum and alkaline substances and has good fluidity without adding bone. However, due to the impurities harmful to the hydration performance of phosphogypsum produced in the industrial production process of phosphoric acid, further pretreatment is required before use, and the process flow will increase, otherwise the performance of the product will also decline; application The Chinese patent No. 201910633885.1 discloses a sandless lightweight self-leveling dry powder mortar, using cement as the cementitious material, adding fly ash, heavy calcium carbonate and perlite to prepare sandless lightweight self-leveling dry powder mortar, of which ordinary The amount of Portland cement added is 72-75%, and the dry density is higher than that of gypsum-based materials. The addition of air-entraining agents will cause air bubbles to float on the surface under high fluidity conditions, resulting in surface perforation, and the surface needs to be treated again; application number The Chinese patent No. 201910624421.4 discloses a ground sand-free leveling composition and its preparation method and construction method. It also reduces the density by adding lightweight aggregate and air-entraining agent to the cement. However, due to the high fluidity, the net The air bubbles in the slurry are unevenly distributed, or float on the surface to cause uneven surface, which is prone to delamination, making the upper layer low in strength, and easy to wear and sink in actual use

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