Prediction of the impact of shrinkage on concrete strength with the beam-particle approach
Résumé
Durability is a relevant criterion for preserving a safe structure and avoiding the renewal of costs. However, several phenomena-such as delayed deformation, corrosion, leading to cracking-can severely affect the service life. Not only cracks opening have an influence on concrete performance, but also the crack pattern. In the case of drying shrinkage, due to the low rate of gas and water transfers, stress that may lead to a network of micro-cracks Mechanical and hydric properties are directly impacted by those cracks. Therefore, it seems essential to consider shrinkage when studying cracking of cementitious materials. This study focuses on a beam-particle model in order to investigate the formation and impact of drying shrinkage cracks. The cohesion of the material is obtained with a lattice of Euler-Bernoulli brittle beams. When a crack occurs, cohesion disappears. To capture the crack closure, a contact law with friction is considered between the polygonal particles. 2D simulations on three points bending test with or without considering drying shrinkage are performed. The finite element method is used to obtain the drying shrinkage strain field. Then, a reanalysis method-inspired from [1]-is used to obtain the cracking patterns caused by drying. The parameters of the numerical models are identified on the results of an experimental campaign carried out by Soleilhet.F [2]. This same campaign is then used to validate the pertinence of an explicit representation of cracking.
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