Influence of mineral impurities on the pozzolanic reactivity of metakoalin

© RILEM 2015. In nature, kaolinite deposits are rarely completely pure. In addition to the mineral kaolinite other clay minerals such as smectites and illites, but also non-clay minerals such as quartz, feldspar, calcite and muscovite are often present in the clay. These less pure clays are economically interesting to be used as SCM, however the impurities might have an effect on the pozzolanic activity or/and the calcinations process. Therefore this study will investigate how these impurities effect the pozzolanic reactivity of the calcined clay and whether the optimal firing temperature change due to the presence of the impurities.status: publishe