Despite the presence of crystalline SiO2 in the form of quartz in
SCBA, many authors report pozzolanic activity for this material. For
example, Villar-Coci~na et al. [10], observed a significant variation in
electrical conductivity in a calcium hydroxide solution with the
addition of SCBA. In other studies [4,11,12], high mechanical resistance was
observed in pozzolanic activity test.