Abstract
Pastes made with different fly ash contents and water/binder ratios were tested at different ages. The total porosity and pore size distribution were measured by mercury intrusion. The fractal dimension of pore-solid interface was first measured by small angle X-ray scattering (SAXS). The relationship between porosity and strength for high-volume fly ash (HVFA) paste was determined. It is obtained that the pore size distribution affected both compressive strength and flexural strength, but the effects on compressive strength and on flexural strength are different. Preliminary experimental results indicated that strength was closely related to the pore surface fractal dimension.
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