Monitoring the reactivity of pozzolans by thermogravimetric method

Abstract

This work focuses on comparing the effect of ten different types of pozzolans on the strength of lime pastes in relation to their pozzolanic activities as determined by the Chapelle test and monitoring the reactivity of these pozzolans using the thermogravimetric method. It was found that the Chapelle test can in some cases overestimate the reactivity of the pozzolan due to differences between the conditions during the test and in reality. The strengths of lime-pozzolan pastes did not correlate well with the pozzolanic activity values of the pozzolans used. On the contrary, the amount of reacted lime in the pastes, determined by the thermogravimetric method, correlated very well with the compressive strengths of the pastes.