Strength Characteristics of Expansive Mortar Cured Under Pressure Condition

Abstract

Expansive additives that is used to reduce the cracking of concrete are admixtures, and develops chemical prestress under restraint conditions. Although adequate strength development by the use of expansive admixtures is an extremely important issue for the safety of the structure, the relationship between the restraining force during curing and the strength of the expansive concrete has not been sufficiently investigated. In this study, mortar specimens containing the expansive admixture are used, and the effect of changes in restraint conditions during curing period on strength development were evaluated from bending and compression test results. As a result, it was found that the appropriate confining pressure in the initial stage of curing did not reduce the strength due to drying. In addition, no difference in strength was confirmed due to the difference in the magnitude of the confining pressure applied during curing.