Figure 2 shows the XRD
pattern of SCBA, where the quartz (SiO 2 ) is evident and
consistent with its high SiO 2 contents of 54.4 % as shown
in Table 1. The fine aggregate used was river sand with a
fineness modulus of 2.40. The absorption value is 1.61 % ,
and its relative density at the saturated surface dry (SSD)
condition is 2.64.