Creep and shrinkage of self compacting concrete: Experimental behavior and numerical model

In the present paper, the results of an experimental campaign concerning the rheological properties of hardened self-compacting concrete are presented. Four mixes of self-compacting concrete have been cast, with different compressive strength. For each mix, compressive strength and shrinkage evolution with time have been monitored along a period of time of about one year. Creep tests have been performed at two different stress levels, 35% and 55% of comparative strength, and with two different ages at loading (7 and 28 days). Results have been compared with Model Code 1990 provisions. Finally, a simplified non linear creep model has been proposed wich is able to properly take into account the effect of remarkable strength increase with time observed in young self compacting concretes.