Applicability of lime reactivity strength potential test for the reactivity study of limestone calcined clay cement

Abstract

Limestone calcined clay cement (LC3) allows clinker replacement up to 50% but it can also be designed for other replacement levels based on the quality of raw materials and required properties. In this study, LC3 was prepared with different proportions using clinker replacement levels of 50%. Two different types of calcined clay and three different types of carbonates were used as supplementary cementitious materials (SCMs) for preparing LC3. The compressive strength of LC3 cement mortar cubes were checked for the age of 28 days. The pozzolanic strength potential of limestone and calcined clay (LC2) blends were tested with the lime reactivity test as per Indian Standard 1727. The lime reactivity test showed the highest reactivity for blends comprising clay and limestone in the proportion of 2:1. Similar result was observed in the case of LC3 mortar strength. The 28 days cement mortar strength results were correlated with the lime reactivity strength potential test and good correlation was observed. On the basis of results, it was concluded that the lime reactivity strength potential test could be directly applicable to the reactivity study of LC3 even at varying proportions of limestone and calcined clay.