Abstract
Internal curing methods, which supply water inside concrete using highly absorbent materials, have been investigated to reduce early-age shrinkage in high strength concrete. This study investigates changes in the concrete pore structure caused by internal curing. High strength concrete was mixed with 0–25% replacement of fine aggregate with expanded lightweight aggregate, the compressive strength and autogenous shrinkage of the specimens were measured, and a micropore analysis was performed. The increase in shrinkage reduction with increasing expanded lightweight aggregate replacement was confirmed, observing that the hydration and meso-pore concentration in the cement matrix increased, resulting in a denser structure.
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