Abstract
Although numerous durability investigations on self-consolidating concrete [SCC] have urged partial replacement of cement with pozzolans, contradictory results exist regarding the salt scaling resistance of pozzolanic concrete. Hence, this study was carried out on salt scaling resistance of binary, ternary and quaternary pozzolanic SCC utilizing trass, pumice and silica fume pozzolans in nine mixtures along with two air-entrained ones. The binary, SF10, majority of ternaries, SF10T10, SF10T20 and SF10P10, and air-entrained, SF10A3% and SF10T20P20A3% mixtures showed acceptable resistance against salt scaling with scaling lower than 0.8 kg/m2, as opposed to quaternaries. The effect of pozzolans on salt scaling resistance of concrete is highly dependable on the SiO2+Al2O3+Fe2O3 content of the pozzolan. Also, microstructural analysis through SEM reflected the presence of ettringite and Friedel’s salt from scaled surface. Furthermore, except for compressive strength, ternaries and quaternaries, SF10T10P10, SF10T20P10, SF10T10P20 and SF10T20P20, performed generally better than binary in rapid chloride penetration test, while they had similar pulse velocity, depth of penetration, water absorption and electrical resistivity.
Published Version
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