Influence of Shrinkage Reducing Agent on Thermal Strain of Plastering Mortar under Daily Fluctuation of Outer Wall Temperature

Abstract

We focused on using the shrinkage reducing agent (SRA) as one of crack reduction methods in the plastering mortar used for the outer wall of the RC building, and acquire the time dependent change of thermal expansion coefficient under the temperature history simulating the daily fluctuation of the outer wall temperature, and investigated an experimental study on the influence of the SRA on thermal strain. As a result, it was experimentally shown that the direction of the thermal fluctuation immediately after construction can be one of the risks of crack, the SRA exerts its effect when the temperature rises, and it becomes a factor that further promotes the occurrence of thermal strain due to the effect of the SRA when the temperature falls.