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Self-levelling mortar has been increasingly recognised as a floor levelling material. Self-levelling mortar is mainly made of adhesive, sand, filler, superplasticiser, retarder, coagulant promoter, defoamer and other more than 10 kinds of materials pre-mixed by the factory, which has good stability. Self-levelling mortar has high requirements for flow, apparent state, shrinkage and strength, which requires us to select all raw materials used for self-levelling mortar to meet the performance requirements of the material. Defoamers have different chemical structures and properties, different foam systems, different foam suppression, foam breaking stability, foam breaking rate, etc.. Defoamer used in the mortar, at the same time to be chemically inert, as far as possible, does not affect the other properties of the mortar.

Defoamer on the flow of self-levelling mortar effect

After adding defoamer in cement-based self-levelling mortar system, it can make self-levelling mortar flow degree increase, change the apparent state of the mortar after hardening, increase the wet density of the mortar, so as to make the self-levelling mortar hardened compressive and flexural strength level increase. Adding defoamer helps flow, but there are differences in the suitability of different types of defoamer and the whole mortar system, and there are also differences in the effect of flow.

The effect of defoamer on the wet density of self-levelling mortar

The addition of defoamer on the self-levelling mortar wet density growth is very fast. However, different types of defoamer on self-levelling mortar wet density changes slightly different, so different types of defoamer applied to the same self-levelling mortar system defoaming ability there are differences. Appropriate prolongation of the resting time, self-levelling mortar wet density will increase slightly, so self-levelling mortar mixing, can be appropriately prolonged after the resting time, in order to enhance the anti-foaming ability of self-levelling mortar.

The effect of defoamer on the apparent state of self-levelling mortar

Add defoamer self-levelling mortar after hardening the apparent state is changed. After mixing the self-levelling mortar, the appropriate prolongation of the wet mortar standing time can improve the defoaming ability of the self-levelling mortar, so that the apparent state of the hardened self-levelling mortar has been further changed, so that the surface of the mortar is free of small pinholes, and has a better homogeneity.

Influence of defoamer on the strength of self-levelling mortar

The compressive and flexural strength of self-levelling mortar increases with the addition of defoamer. The flexural strength of self-levelling mortar is increased from F4 strength grade to F6 strength grade or above, and the compressive strength is increased from less than C16 strength grade to C20 strength grade or above. However, there are differences in the effects of different types of defoamers on the strength of self-levelling mortar.

There are differences in the suitability of different grades of defoamers in the same mortar product, resulting in differences in the performance of the mortar product. Selecting a suitable defoamer in mortar products that require the application of defoamers can greatly help to improve the comprehensive performance of mortar.