Cement-based self-leveling mortar

Abstract

The invention relates to cement-based self-leveling mortar, which is prepared from the following raw materials in percentage by weight: 35 to 40 percent of No.425 ordinary portland cement, 10 to 15 percent of No.42.5 rapid hardening sulphoaluminate cement, 15 to 18 percent of heavy calcium carbonate, 0.45 to 1 percent of high polymer, 0.15 to 0.3 percent of water reducing agent, 0.15 to 0.3 percent of early strength agent, 0.15 to 0.3 percent of retarder, 0.15 to 0.3 percent of thickener and the balance of fine river sand with the fineness modulus of 1.2 to 1.5. Compared with other traditional cement self-leveling mortar, the self-leveling mortar has the characteristics of higher fluidity, higher leveling property, high early strength and the like.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a cement-based self-leveling mortar. Background technique [0002] Cement-based self-leveling mortar has good fluidity and stability, high early strength, fast construction speed, and low labor intensity. It is an ideal material for ground paving of large supermarkets, parking lots and warehouses, and is also an ideal material for ground construction of modern buildings. The development direction has great market potential. Compared with developed countries, the research on cement-based self-leveling mortar in my country started relatively late, around the late 1980s and early 1990s, and the initial development speed and popularization were also slow. On the one hand, it is because this material is not very suitable for the national conditions at present. The second is that the current domestic economy and construction technology are relatively backward, and the cost of large-...

AI Technical Summary

Problems solved by technology

On the one hand, it is because this material is not suitable for the national conditions at present.

Second, the current domestic economy and construction technology are relatively backward, and the cost of large-area use in construction projects is relatively high, which is difficult for users to accept

[0003] (1) The early strength is low. Since the cement-based self-leveling mortar generally uses ordinary Portland cement as the main cementing material, ultra-fine sand and high water-cement ratio are used, the early strength of the mortar is seriously insufficient, which directly affects the construction process. and the time when the project was put into use

[0004] (2) The flatness of the mortar surface is not enough. Due to the imperfect mortar formula, it is easy to produce surface sanding, peeling, hollowing, etc., which not only affects the appearance, but also directly endangers the quality of self-leveling mortar

[0005] (3) Insufficient wear resistance, self-leveling mortar is mainly suitable for large supermarkets, shopping malls, parking lots, factory workshops, warehouses and other floors, which require high wear resistance

[0006] (4) After the mortar is hardened, it is easy to shrink and crack

This leads to cracking after the mortar hardens

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