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With the aim of suppressing autogenous shrinkage of high strength concrete with a design strength exceeding 100 MPa, the authors investigated the effect of internal curing using artificial lightweight fine aggregate (LWFA) made of typical expanded shale. The compressive strength decreased as the replacement ratio with LWFA increased. However, we found that a certain level of prewetted LWFA can drastically reduce autogenous shrinkage, while retaining a high compressive strength. It was also found that the use of LWFA led to a slightly larger amount of calcium hydroxide deposit at early ages, but long-term hydration products turned out to be nearly equal to the case of using common fine aggregate.

MITIGATION OF AUTOGENOUS SHRINKAGE OF HIGH-STRENGTH CONCRETE USING PRE-WETTED ARTIFICIAL LIGHTWEIGHT FINE AGGREGATE