In the present investigation, the inside of a box made of plywood
(300× 300 × 300 mm) was packed with expanded polystyrene foam
(25-mm thickness), which acted as insulation. The following SCC
mixtures were tested in this apparatus: 100% OPC, and OPC replaced by 20 wt% RHA without or with 5, 10, or 20wt% urea. Before casting the
concrete, a thermocouple (Type K) was inserted into the center of each
box through a hole drilled in the polystyrene foam lid. The
thermocouple was connected to a computer-driven data-logger system.
Ageneral view of the plywood box and the test arrangement is shown in
Fig.4.