EXPERIMENTS ON COMPRESSIVE STRENGTH AND PORE STRUCTURE OF CONCRETE USED BLAST FURNACE SLAG FINE AGGREGATE

Abstract

In this study, compressive strength and pore structure of concrete used blast furnace slag fine aggregates that was produced by 3 different steel factories and 1 type natural river sand as compared were examined, and the relationship between compressive strength and porosity was discussed. To concrete used blast furnace slag fine aggregates, compressive strength is lower and porosity is higher than concrete used sand at early ages. At long ages, compressive strength of concrete used blast furnace slag fine aggregates is higher and porosity is lower than concrete used sand when water cement ratio is 55%, but the compressive strength of concrete used blast furnace slag fine aggregates is lower when water cement ratio is below 40%. Young's modulus of concrete using the blast furnace slag fine aggregate is higher than concrete used sand. The relationship between compressive strength and porosity of concrete used blast furnace slag fine aggregates is very consistent with common strength-porosity equation about concrete as well as the concrete used sand.