アーウィン含有クリンカー-セッコウ-スラグ系セメントの水和反応とpH挙動

概要

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Four types of cement were prepared by mixing hauyne-containing clinker, anhydrite and blastfurnace slag (HAS cement), and their hydration reaction and pH behavior were investigated. HAS cement pastes cured for 3-180 d contained ettringite, calcium silicate hydrate (C-S-H) and Al(OH)_3 gel as hydrates, but neither Ca(OH)_2 nor monosulfate hydrate. Measured pH values of the liquid phases coexisting with hardened HAS cement pastes were in the range of 11.3-12.3, and each of them agreed well with the pH value calculated from ionic concentrations in the liquid phase. Final hydrate of each cement paste was estimated from chemical composition of cement, and then a final pH of liquid phase was presumed from CaO/SiO_2 ratio of estimated C-S-H. Measured pH showed similar tendency to the estimated final pH, but the former grew relatively higher than the latter especially in the range of lower pH. It was considered that coexisting alkali ions remarkably influenced liquid phase in that pH range. The compressive strengths of HAS cement mortars cured for 28 d were about 37-39 N/mm^2.
社団法人日本セラミックス協会の論文
1996-11-01