cement mortar

fly ashes

autogenous shrinkage

hydration

portland cement

permeability

blast furnace slag

geopolymer composites

ca oh

cement

Construction and Building Materials

• Hydration and pore structure characteristics of HVFA cement were investigated. • The degree of hydration of cement increased with the fly ash replacement ratio. • The degree of reaction of fly ash showed an opposite trend. • The correlation between degree of hydration and pore structure was identified. • The gel/space ratio showed strong correlation with the compressive strength. The hydration characteristics and microstructure of HVFA cement were investigated according to the FA replacement ratio and the correlation between the degree of hydration and pore structure was analyzed. As the FA replacement ratio increased, the degree of hydration of cement increased, but the degree of reaction of FA decreased. The gel/space ratio of the HVFA cement paste showed strong correlation with the compressive strength. As the FA replacement ratio increased, the surface fractal dimension decreased in the micro region. The surface fractal dimension in the micro region showed strong correlations with the compressive strength and gel/space ratio.

Hydration and pore-structure characteristics of high-volume fly ash cement pastes