Physical property changes of mortar with a low-water binder ratio with a focus on water movement and equilibrium

Regarding the reaction potential of materials with a low water-binder ratio composition containing fly ash, the authors conducted an experimental study using artificial lightweight fine aggregate, with a focus on the utilization of water that migrates and balances associated with internal curing and high-temperature load. As a result, regardless of the presence or absence of artificial lightweight fine aggregate, it was confirmed that when high temperature was applied after the age of 91 days, the materials remarkably densified and greatly increased in strength regardless of the high-temperature load starting material age. In high-temperature and high-humidity environments, the tendency to become dense while absorbing moisture as hydration progresses was suggested, which was consistent with the results of studies using a thermodynamic coupled analysis that considers the relationships between hydration, void structure, and water content. Furthermore, the authors performed microscopic observations with a scanning electron microscope, and added systematic insight. (A.O.)