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Importance of water retention of HPMC in mortar

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Mortar widely used are plastering mortar, crack resistant mortar and masonry mortar. Their differences are as follows:

Crack resistant mortar:

It is a mortar made of anti cracking agent made of polymer lotion and admixture, cement and sand in a certain proportion, which can meet a certain deformation and maintain no cracking.

The crack resistant mortar is the finished material, which can be used by adding water and mixing directly. The finished anti crack mortar material is fine sand, cement and anti crack agent. The main material of the anti cracking agent is a kind of silica fume, which can fill the pores between cement particles, form gels with hydration products, and react with alkaline magnesium oxide to form gels.

Plastering mortar:

The mortar applied on the surface of buildings and components and the surface of base materials, which can protect the base course and meet the use requirements, can be collectively referred to as plastering mortar (also known as plastering mortar).

Mortar masonry:

An additive for building stacking consisting of gel material (usually cement and lime) and fine aggregate (usually natural fine sand).

Water retention of mortar refers to the ability of mortar to preserve water. Mortar with poor water retention is prone to bleeding and segregation during transportation and storage, that is, water floats above and sand and cement sink below. It must be re mixed before use.

All kinds of base courses requiring mortar construction have certain water absorption. If the water retention of mortar is poor, in the process of mortar coating, as long as the ready mixed mortar contacts with the block or base course, the water will be absorbed by the ready mixed mortar. At the same time, the water will evaporate from the surface of mortar facing the atmosphere, resulting in insufficient water for mortar due to water loss, affecting the further hydration of cement, affecting the normal development of mortar strength, resulting in strength In particular, the interface strength between the mortar hardened body and the base becomes low, resulting in mortar cracking and falling off. For the mortar with good water retention, the cement hydration is relatively sufficient, the strength can develop normally, and it can bond well with the base course.

Therefore, increasing the water retention of mortar is not only conducive to construction, but also increase the strength.

Post time: May-27-2022