Z E M C H 2 0 1 2 I n t e r n a t i o n a l C o n f e r e n c e
650
Fig. 7 X-ray diffraction patterns of EAFS according to the time
Fig. 8 SEM Image of EAFRS according to the time
4. Conclusion
The study was undertaken to develop an inorganic binder by mixing the EAFRS with the
gypsum to obtain the following result.
1) When the gypsum and retardant are used together, the initial set and final set time are
confirmed as increased as the mixed volume of gypsum increased compared to case of
using only the retardant.
2) Without gypsum, the EAFRS shows high hydration temperature of 110
℃
. However
following the mixture of the gypsum, it is stable to be 70
℃
.
3) In the event that the gypsum is mixed, EAFRS shows compressive strength of 20MPa
in 3 hour ago and similar strength of 28 age of OPC in 1day. In addition, the strength of
