Cement-based self-leveling mortar

Abstract

The invention relates to the field of building material, and in particular relates to cement-based self-leveling mortar, which takes sulphoaluminate cement as basic cementing material and quartz sand as aggregate, uses b-semi-hydrated gypsum to control the mortar not to contract and utilizes other additives to enable the prepared mortar to have the comprehensive performances required by the cement-based self-leveling mortar. The newly stirred mortar has the performances of high fluidity, self-leveling property, bleeding resistance and separation resistance; and the hardened mortar has the performances of shrink resistance, crack resistance, high surface hardness and good wear resistance. Compared with the existing self-leveling flooring mortar product with shrink resistance and crack resistance, the cement-based self-leveling mortar is low in production cost and wide in application scope.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a cement-based self-leveling mortar. Background technique [0002] Cement-based materials, including cement mortar and concrete, are engineering materials widely used in the ground. At present, the construction methods to ensure the flatness and level of the floor are: [0003] (1) When constructing the concrete floor (bottom plate), use a laser leveling machine to level and smooth it; [0004] (2) Apply a layer of mortar leveling layer on the uneven or uneven concrete floor. [0005] The commonly used production methods for existing mortar are: use Portland cement as the cementitious material, use ordinary construction sand (0.160-4.75mm in particle size) as the aggregate, and use various admixtures such as water reducers (ordinary, high-efficiency or ultra-high efficiency), viscosifiers (cellulose ether, rubber powder, etc.), mineral admixtures (fly ash, mineral powder, sil...

AI Technical Summary

Problems solved by technology

However, using aluminate cement to produce self-leveling mortar is still technically difficult, and the mortar not made of aluminate cement will not crack

In addition, the price of aluminate cement is high, and the price of self-leveling mortar products made of aluminate cement is also high, which hinders its wide application

In addition to the products of two companies in Germany, the existing self-leveling mortar is used as a floor material, and cracks will appear to varying degrees in actual application

Therefore, the products of other companies on the market are actually only suitable for leveling the floor cushion, not for the surface layer

Although the self-leveling mortar floor materials of two companies in Germany have overcome the problem of cracks well, they have the disadvantages of high cost and high cost, which hinder their application.

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