Composite cementitious material and ground self-leveling mortar using same

Abstract

The invention provides a ground self-leveling mortar comprising gelatinization materials, fine sand and an additive. The gelatinization materials comprise sulphate aluminium cement, silicate cement and plaster. The self-leveling mortar comprises the components by weight percentage of: 30% of sulphate aluminium cement, 12.6% of silicate cement, 46.15% of fine sand, and 4.75% of additive. The plaster is a natural hard plaster or reverse 8-type hymihydrate plaster. The additive comprises: redisperse emulsion powder, early strength agent, a retarder, a super-plasticizer, a defoamer and a stabilizer. The ground self-leveling mortar uses the sulphate aluminium cement to replace aluminate cement to be combined with the silicate cement and the plaster, so as to solve the problems that the aluminate cement is high in price and difficult to purchase, and overcome the contradiction between shrinkage and expansion, thus avoiding the self-leveling floor hollowing and cracking and ensuring the bonding strength, folding and compressingresistance strength as well as wearing resistance to reach the optimized level.

Description

technical field [0001] The invention relates to a cementitious material, in particular to a composite cementitious material with cement and gypsum as cementing materials. The present invention also relates to a self-leveling mortar, and more specifically relates to a ground self-leveling mortar using the composite gelling material. Background technique [0002] The cementitious material is a material that can change from a slurry to a solid stone-like body under physical and chemical actions, and can cement other materials to form a composite solid with certain mechanical strength. Portland cement is the most important cementitious material for construction in the world today. Its clinker is composed of tricalcium silicate (C 3 S) Based on minerals, Portland cement has the advantages of abundant raw material reserves, low production costs, and mature production processes. However, Portland cement has long setting time, low early strength, large shrinkage rate and poor dura...

AI Technical Summary

Problems solved by technology

In the 1970s, China invented sulfoaluminate cement, which contains a large amount of calcium sulfoaluminate (C 4 A 3 ) minerals, the cement has the characteristics of early strength, high strength, low alkalinity and low production energy consumption; but many experiments have proved that when sulfoaluminate cement is mixed with Portland cement, it will occur in a large proportion The setting time of composite cement is accelerated sharply, and even rapid setting occurs, which causes the problem of obvious reduction in early strength. Therefore, under normal circumstances, these two cements cannot be mixed.

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