Kovalchuk et al. [22] studied the effect of thermal curing conditions on pore structure (total porosity and average pore diameter), down to a minimumpore diameter of 0.0067 μm, using amicrometrics autopore II 9220 porosimeter. They found that curing conditions, particularly the relative humidity, play an essential role in the development of the
material's microstructural characteristics (such as porosity and phase composition), kinetics and degree of reaction and their respective macroscopic properties. Large pores (10–50 μm) were observed on dried cured specimens, which caused a lowering the compressive strength.
Dry heat curing is not recommended for low calcium fly ash systems.
To the contrary, when the specimens were wet cured, the resulting