Proportioning with Ground Limestone and Mineral Filler-Sulfate Resistance of Concrete Produced with Portland-Limestone Cements (PLC) and Supplementary Cementitious Materials (recorded presentation)

Sulfate Resistance of Concrete Produced with Portland-Limestone Cements (PLC) and Supplementary Cementitious Materials (recorded presentation)

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Video Summary

This presentation delves into the sulfate resistance of concretes containing limestone cements like C595-1L, combined with supplementary cementitious materials (SCMs). The focus is on whether such combinations increase the risk of sulfate attack, specifically tomasite sulfate attack, which is a concern in cold and wet environments due to its potential to severely degrade concrete structures. The Canadian and U.S. standards have cautiously accepted limestone cements, with research into their performance spanning over a decade, examining both mortar bars and concrete structures. The results show that using SCMs like slag, fly ash, and silica fume enhances the sulfate resistance of these limestone cement-based concretes, often outperforming traditional Type V Portland cement. Concerns remain about the tomasite attack under low temperatures and carbonate presence, but evidence suggests that well-designed mixes can avert this issue. The ultimate goal is to balance enhanced material performance with sustainability benefits.

Keywords

sulfate resistance

limestone cements

supplementary cementitious materials

tomasite sulfate attack

concrete durability

sustainability