Investigation on scaling of SCC containing pozzolanic blends

Document Type : Research Paper

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Faculty of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran

10.22124/jcr.2022.20957.1528

Abstract

Pozzolans are alumina-silicate materials, partially replacing cement to improve many durability features of concrete. They can also help the environment and contribute to sustainable development through reducing the production of cement, culminating in the decrease of carbon-dioxide. One of the important applications of pozzolans is in the production of self-consolidating concrete (SCC), a concrete that has been receiving extensive attention nowadays due to its properties. On the other hand, one of the durability features is the resistance of concrete against scaling due to freezing and thawing in the presence of salt that generally causes distress in the surface of concrete. In some previous studies, it was observed that binary (one pozzolan along with cement) and ternary (two pozzolans along with cement) blends decreased resistance against salt scaling despite providing considerable improvements in durability characteristics of concrete. There has been limited studies on scaling resistance of ternary and quaternary blends (three pozzolans along with cement) done to date. Hence, the purpose of this study was to investigate the effect of binary, ternary and quaternary blends on SCC scaling. For this purpose, 0, 10 and 20 percent of trass and pumice, beside 10% of silica fume was used in 9 mixtures in addition to two mixtures with 3% air-entrainment. The results illustrated that a ternary mix had the best performance among non-air-entrained mixtures. Overall, binaries and ternaries illustrated good scaling resistance compared to quaternaries. In addition, air-entrainment significantly increased resistance against salt scaling.

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