The role of Gypsum in Portlandite Stone Structure Formation

Yaroslaw Yakymechko and Bogdan Chekansky
Lviv Polytechnic National University 12 S. Bandera St., 79013 Lviv, Ukraine
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The hydration of calcium oxide has been examined in the presence of SO42-. The conditions, under which portlandite stone with the best physico-mechanical properties was formed, have been determined. The hardening conditions affect the phase composition and microstructure of portlandite stone with a bihydrated gypsum. The mechanism of CaO hardening has been determined in the presence of SO42- ions

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