ABSTRACT
Among the various factors affecting DEF in concrete, the mineralogical composition is an interesting one because firstly of the industrial consequences and secondly because of the implications in the understanding of DEF in concrete. In this paper, two concretes were fixed with the same quantity of Portland cement CEMII/A L (with 6% of calcareous additions), the same water-cement ratio (0.57) and the same quantity of aggregates. Only the nature of the aggregates was different: calcareous or siliceous. The same thermic treatment was applied to the two concretes and DEF is generated in the two. However, amplitude and kinetics are very different, calcareous aggregates inducing a lower swelling. Finally, different explanations (mechanical, chemical and coupled) of these differences are discussed.
