AUTOGENOUS SHRINKAGE PROPERTIES OF ULTRA-HIGH-STRENGTH CONCRETE SUBJECTED TO EARLY HEAT CURING AND A TECHNIQUE FOR THEIR PREDICTION

Abstract

Concrete with a design strength of 100 to 150 N/mm² made using low-heat portland cement and silica fume (LSF) was subjected to thermal histories with different maximum temperatures (T_max) to examine their autogenous shrinkage properties. The autogenous shrinkage properties were found to significantly change when T_max exceeded 45 to 60°C. Comparing these results with past studies using portland cement, the authors clarified the autogenous shrinkage properties of LSF concrete and proposed a technique for their prediction by modifying conventional equations. Furthermore, the applicability of the proposed method was verified.