THE INFLUENCE OF ALUMINA REACTIVITY ON THE HYDRATION BEHAVIOR OF MONOCALCIUM ALUMINATE

The influence of alumina reactivity (specific surface area and Na2O co ntent) on the hydration of mono calcium aluminate (CA) is investigated . It was found that additions of alumina influence the hydration behav iour of CA and lead also to differences in the microstructure of the h ardened pastes. Besides the specific surface area and Na2O content, th e reasons of these influences seem to be connected with the concentrat ion of weak acid sites which obviously causes changes in the nucleatio n mechanism of the hydrates.