Abstract
The nature and the porosity of sand and gravel impact significantly the development of the free deformation at early age of cement based materials. For recycled concrete, the high porosity and the subsequent internal water curing provided by recycled sand and gravels cause a decrease of the autogenous shrinkage, limit the increase of the CTE during the first days after setting and globally increase the CTE (up to 50%). A new model was developed for the consideration of the internal curing effect on the development of the autogenous strain. It is observed that the autogenous strain development induced by the internal water curing effect of the recycled sand and gravels can be modelled by an exponential law according to the equivalent age and by a sinusoid law according to the hydration degree.
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