Effect of supplementary cementitious materials (scm) on delayed ettringite formation in heat-cured concretes

Delayed Ettringite Formation (DEF) is an internal sulfate attack caused by early age heating to a temperature of over 70 °C. In this paper, the effect of multiple mineral admixtures (Fly ash, metakaolin and natural pozzolan) of different nature or origins (two of each admixture) on the expansion of cylindrical concrete caused by DEF was investigated. For this purpose, a portion of cement was replaced by natural admixture with 15% dosages by fine admixture. The results obtained highlighted the significant effects of fly ash on DEF and the correlation existing between the expansion of the heat-cured concrete specimens and the evolution of their mechanical properties.