Study of High Strength Concretes at raised Temperature up to 200 °C ? ThermalGradient and Mechanical Behaviour

摘要

Data on the high strength concrete behaviour at high temperature is of concern in predicting the safety ofbuildings and constructions in response to certain accidents or particular service conditions. Investigations were carriedout on the behaviour of four concretes (two high strength concrete with and without polypropylene fibres, onelightweight aggregate concrete and one normal strength concrete). The four groups of specimens were subjected toidentical testing conditions. After a heating- cooling cycle at 200 °C, thermal gradient and thermal stability, compressivestrength, modulus of elasticity and splitting tensile strength were analysed. Comparisons and interesting conclusions weredrawn about the thermal stability at high temperature and the residual mechanical properties of the tested concretes.