A Correlation Study Between Lime Reactivity Strength Test and Calorimeter for Different SCMs

Abstract

Supplementary cementitious materials (SCMs) are added to improve various mechanical and durability properties of cement and concrete. One of the indirect benefits of binary and ternary blended cements is to reduce CO2 emissions. As per Indian standards (IS), reactivity of pozzolanic material is observed in the presence of calcium hydroxide (CH) using lime reactivity test. A pozzolana should qualify lime reactivity test before adding it to the cement. In this study, reactivity of SCMs was observed using lime reactivity strength test and isothermal calorimeter. For this purpose, different calcined clays, fly ashes (FA), and slags were selected. Lime reactivity test was used to study the mechanical strength potential of SCMs and calorimeter was performed to measure total energy evolved during the reaction of SCMs with CH in the presence of water at 27 °C. Strength data from lime reactivity test was then finally correlated with the calorimeter heat evolved data in different conditions.