Shrinkage Reduction Type of Advanced Superplasticizer

Abstract

Recently, accompanying the increase in higher strength and flowability of concrete, polycarboxylate-based superplasticizers have attracted much attention. In order to develop an advanced superplasticizer accommodating new functions, we attempted to develop polycarboxylate-based high-range water reducing superplasticizers with high durability as a new function. To increase the durability of concrete, we focused on shrinkage reduction, one of the factors affecting durability, and studied various compounds exhibiting shrinkage reduction. We investigated the relationship between their chemical structures and shrinkage reducing effects. In addition, we synthesized a new series of superplasticizers in which these compounds were attached to the structure of various polycarboxylate polymers, and determined the shrinkage reduction effect by testing concrete with these agents. As a result, we have developed a polycarboxylate-based advanced superplasticizer exhibiting excellent shrinkage reduction.