Studies on guest-ion incorporation in Portland cement - Part 2

摘要

Limestone is increasingly being used as an additive to Portland cement [22] where a part of it will react with the hydrating aluminate species, released by dissolution of the calcium aluminate and ferrite phases or the Al~(3+) guest ions in alite and belite, and form calcium monocarboaluminate hydrate (Ca_4Al_2(OH)_12C0_3·5H_20). Thus, limestone acts not only as a filler but contributes also to the strength development by the formation of this phase. For traditional mixtures of Portland cement and limestone, the optimum performance is achieved at about 4 wt. % limestone replacement for a Portland cement with a typically alumina content of 5-6 wt. % [23].