At 30 % SCBA replacement
to cement, it could be that only 10 % SCBA acted as
pozzolanic materials, and 20 % SCBA acted as fillers. In
addition, the SCBA presents physicochemical properties
appropriate for its use as mineral admixture, and its reactivity
depended mainly on the maximum particle size and
fineness. SCBA particles used in this study were of irregular
shape with rough surfaces and highly porous textures
and lower specific gravity and higher L.O.I. compared to
that of cement. Thus, the replacement of cement by SCBA
indicates the lower compressive strengths.