Long-term behaviour of concrete

Abstract

ABSTRACT The study of temperature impact on the degradation of cementitious materials has been done with an experimental and a modelling approach. Leaching degradation of CEM I and CEM V cement paste samples were realised for three temperatures (25, 50 and 85°C). These samples have been characterised using several methods (XRD, SEM-EDS and electron microprobe). On other hand the experimental protocol used allows the amount of released species and mainly calcium (Ca2+) and hydroxyls (OH−) to be followed during degradation. The concept of modelling used to describe such a type of degradation and the impact of temperature is explained. The experimental data and the modelling results are compared. Whatever the type of cement-based materials, temperature increases the degradation. This increase is mainly due to transport processes.