Application of Polycarboxylate Superplasticizer in Cement Self-leveling

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Polycarboxylate superplasticizer

Application of polycarboxylate superplasticizer in cement self-leveling.

First, the polycarboxylic acid water reduction agent has high collapse, and its collapse is mainly achieved by space steric resistance, so it can achieve the unity of high collapse and ultra-early strength. In the traditional self-leveling formula, it is usually necessary to add some retarder to ensure the operation time and 20 minutes fluidity, and the retarder will adversely affect the performance of the cement due to the change of the cement hydration process, and the use of polycarboxylic acid water reducer can basically do not use retarder, less early strength agent, thereby simplifying the formula, reducing costs, and improving quality stability.

Two is the polycarboxylate water reducing agent due to a slight air entraining and other water reducing agent different adsorption mechanism, making the self leveling mortar in a very high degree of flow can achieve very low bleeding rate, which is other high efficiency water reducing agent does not have, which is the polycarboxylate water reducing agent is particularly suitable for self compacting concrete the main reason.

Three is prone to problems in self leveling mortar is through the expansion agent to compensate for the shrinkage process of cement, expansion effect of expansion agent and maintenance conditions of great relationship, if improper maintenance, it is prone to cracking, pulverization and other performance defects, and it is well known that self leveling cement is often free of maintenance. The use of polycarboxylate superplasticizer will greatly reduce the shrinkage rate of the system, so that the system is in a state of micro-expansion in most cases, thus greatly reducing the occurrence of engineering accidents, but also makes the self-leveling products have good adaptability.

Based on the above advantages of polycarboxylate superplasticizer, we applied it to cement self-leveling mortar. Different types and dosage of polycarboxylate superplasticizer have different effects on cement self-leveling mortar.

Key words:

Polycarboxylate superplasticizer