CHARACTERISTICS AND HYDRATION OF C(12-X)A(7)CENTER-DOT-X(CAF2) (X = 0-SIMILAR-TO-1.5) MINERALS

C(12-x)A(7).x(CaF2) (x = 0 similar to 1.5) minerals were synthesized a nd their hydration was studied. When x is increased in the C(12-x)A(7) .x(CaF2), lattice parameter, a, of the cubic mayenite crystal is decre ased and the gravity of this mineral is increased. X significantly inf luences hydration. C(12)A(7) hydrated and produced thermodynamically i s metastable C(2)AH(8) until 28 days. The conversion reaction from C(2 )AH(8) to C(3)AH(6) was detected from 3 days. When the minerals contai ning F hydrated, stable C(3)AH(6) hydrate was dominantly produced at 2 8 days. At the early hydration time within 3 days, little C(2)AH(8) wa s detected and finally it was converted to stable C(3)AH(6) hydrate at the later hydration time. (C) 1998 Elsevier Science Ltd.