Fracture energy of concrete at very early ages by inverse analysis

M. Matallah (1) , M. Farah (2) , Frederic Grondin (3) , J. Saliba (4) , Ahmed Loukili (3)

1 Université Aboubekr Belkaid - University of Belkaïd Abou Bekr [Tlemcen]
2 LUNAM Université [Nantes Angers Le Mans]
3 GeM - Institut de Recherche en Génie Civil et Mécanique
4 I2M - Institut de Mécanique et d'Ingénierie de Bordeaux

In this paper, the fracture characteristics of concrete at very early ages are investigated. Experimentally , three point bending tests are performed on notched beams at very early-ages (before 24 h) and the Load-CMOD curves are obtained. In order to find the trend of the evolution of the fracture energy, an inverse analysis procedure is developed. A damage model based on an energetic regular-ization is combined with a non linear inverse analysis algorithm. As the stress-strain curve (and the stress-crack opening one) given by the damage model is non linear, the Levenberg-Marquardt algorithm is chosen. Results obtained from numerical simulations show that fracture energy of concrete increases with age.

Mots clés: Fracture energy; early age; inverse analysis

Domaines: Sciences de l'ingénieur [physics]

M. Matallah, M. Farah, Frederic Grondin, J. Saliba, Ahmed Loukili. Fracture energy of concrete at very early ages by inverse analysis. FraMCoS-8 VIII International Conference on Fracture Mechanics of Concrete and Concrete Structures, Mar 2013, Toledo, Spain. ⟨hal-02444557⟩