Abstract
The early strength development of ‘BRECEM’ concretes, made from 50:50 mixtures of calcium aluminate cement (CAC) and ground granulated blastfurnace slag (ggbs), using 100-mm cubes at w/c ratios of 0.35 and 0.45, has been studied. BRECEM concretes showed good strength development at both w/c ratios whether water cured or air cured. In contrast, longer-term studies with 1-m cubes cured under near-adiabatic conditions have indicated that mass BRECEM concretes of similar binder composition may gain compressive strength relatively slowly. This is primarily due to the heat of hydration of the CAC component, which can lead to temperatures of up to 60°C, resulting in rapid hydration and conversion of the calcium aluminate component. However, the performance of 40 CAC/60 ggbs concrete under these near-adiabatic conditions has proved to be satisfactory over a period of 5 years, with similar strength development to that of equivalent 100-mm cubes stored under ambient conditions.
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