In order to produce well defined peak responses in the temperature profiles, cement paste mixtures of low water-binder-ratioo (w/b) were chosen, which also closely relates to the water content required to produce a standard consistence (SANS 50196-3:2006). This allows for a direct comparison between the thermal profile and the measured setting times as the w/b ratio are equivalent for both test procudures. Mixture 1 consists of 100% PC (CEM I 52.5N) and a 50% slag substitution for mixtures 2 and 3 were selected based on the favourable properties found with concrete of this proportioning (Alexander et al., 2003). The mixture proportions are presented in the table below.