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Frost resistance durability and strength of concrete made of crushed sand with different characteristics

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Document pages: 9 pages

Abstract: The effects of fine aggregate content, methylene blue (MB) value and lithology of aggregate (CS) on the frost resistance and strength of concrete are studied, and the frost resistance and strength of aggregate concrete (CSC) and river sand concrete (RSC) are compared. The results show that when the content of fine aggregate reaches 10 , the addition of fine aggregate improves the compressive strength of concrete and reduces the frost resistance durability of C30 concrete, but has little negative impact on the frost resistance durability of C60 concrete. Increasing the MB value will not have a negative impact on the compressive strength of C30 CSC, but will reduce the compressive strength of C60 CSC and the frost resistance durability of CSC. When the MB value exceeds 1.0, the decrease is more obvious. Lithology has no significant effect on the frost resistance and compressive strength of CSCithin the lithologies (dolomite, limestone, granite, basalt, and quartz) studied. Though compressive strength of CSC is a little higher than RSC under equal water to cement ratio, frost durability of CSC is no better than RSC especially for C30 CSC, and air-entraining agent is suggested for enhancing frost durability of C30 CSC exposed to freezing environment.

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