Fig. (10) SEM micrographs of mortar specimen mortars with the following compositions: (a) M1: 90%FA;10%CH; SS/SH=2.5; A/B=1.0; (b) M2: 90%FA;10%CH; SS/SH=2.0; A/B=0.8; (c) M3: 90%FA;10%CH; SS/SH=2.0; A/B=1.0; (d) M4: 80%FA;10%CH; 10%MK; SS/SH=2.5; A/B=1.0 and (e) M5: 70%FA;10%CH; 20%MK; SS/SH=2.5; A/B=1.0.