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Abstract The X-ray diffraction(XRD)，the mercury intrusion porosimetry(MIP) and the environmental scanning electron microscope(SEM) were used to study the activity of fine aggregate of coal gangue under different calcination temperatures and the pore structure of hardened cement mortar of fine aggregate. The relationship between the pore structure and the strength of cement mortar was analyzed. The fine aggregates of coal gangue of different activity had the different levels of secondary hydration reaction with the hydration products of cement in the early period of hydration. The activity of fine aggregate of coal gangue affected the pore size distribution and porosity of hardened cement mortar. A highly active fine aggregate of coal gangue reduced the porosity of hardened cement mortar and optimized the pore size distribution. The harmful holes greater than 200 nm decreased significantly and the less harm or harmless holes of 100，20 nm increased. The hydration products of hardened cement mortar increased accordingly. The activity of calcined fine aggregate of coal gangue from low to high refined the porosity of the mortar，improved effectively the pore structure of cement mortar，reduced its porosity，and improved the strength of the mortar.
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2016, Vol. 35 
