Elastic modulus changes in cementitious materials submitted to thermal treatments up to 1000°C

Three categories of cementitious materials (Portland cement pastes, siliceous and calcareous sand mortars, and microconcretes with siliceous sand and silica fume) were subjected to cumulative thermal treatments at temperatures (T) up to 1000°C. Changes in room-temperature elastic modulus E*(T) of heat treated materials were followed by a non-destructive ultrasonic technique at 10 MHz. Each category exhibits specific changes in E*(T)/E*₀ plotted against T, where E*₀ was the value before heat treatment, irrespective of the water:binder ratio.