Influence of internal curing on the pore size distribution of high strength concrete

摘要

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. (C) 2018 Elsevier Ltd. All rights reserved.