A method is presented for consistent DTA/TGA evaluation using computer software for data analyses. DTA/TGA was used to study the effect of ground quartz addition to cement, Ground quartz was found to enhance portlandite production and calcium silicate hydrate phase formation in 24 hour precured cement:quartz pastes. Calcium silicate hydrate phases formed in autoclaved cement:quartz pastes belonged to the tobermorite group. XRD was found to be more sensitive than DTA in identifying differences in the phases formed after autoclaving.