par Delsaute, Brice ;Carette, Jerome ;Staquet, Stéphanie
Référence 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS(11-03-2013: Toledo), Proceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures
Publication Publié, 2013-03-11
Publication dans des actes
Résumé : This work uses a test rigs enabling the monitoring of the stiffness, the creep and the relaxation of a concrete sample at early age. An experimental methodology using a test rig (Temperature Stress Testing Machine TSTM) specifically designed to measure the evolution of several parameters, such as the elastic deformation, the creep and the relaxation of concrete is presented [1]. In the framework of this study, the TSTM equipment was associated with a dummy specimen in free conditions, a thermal control allowing isothermal conditions and a direct measurement of the concrete displacement without any contact systems. The TSTM consists of an electromechanical testing setup, where one end of the specimen is restrained by a steel anchorage and the displacement of the other end is controlled by a motor moving the other steel anchorage. In the framework of the French national project CEOS.fr, special works have been done on the 'CEOS' concrete: tension and compression tests since two days after casting up to one week are compared. This work presents a methodology which can be used for modeling basic creep and relaxation coefficient of concrete at very early age (since setting time) in tension and compression. All results can be expressed, as proposed by De Schutter [1], in function of the degree of hydration or as proposed by Gutsch [2], in function of the equivalent time, what was chosen in this research for the 'CEOS' concrete.