Early age cracking risk of environmentally friendly concrete


Abstract : The construction of massive elements in reinforced concrete such as bridge-deck, dam or elements in concrete built in different phases can be subject to cracking. Health of mature concrete is influenced by early age cares to prevent cracking processes. Restrained deformations, by re-bars or other stiff environment, are often the origin of cracks. Even if they are not always applied in field applications, remedies are known to prevent cracking processes. Realistic simulations, based on numerical and experimental approaches, can bring a precious help to diagnose cracking risks. Shrinkage and thermal strains in restrained conditions induce tensile stress in concrete. Cracking appeared when stresses exceed the tensile strength. The shrinkage induced stresses are reduced by the creep and the relaxation phenomena. Moreover, time has two effects. The first is an increase of the tensile strength. The second is an increase of the stiffness of the material. A good knowledge of the early age behavior and the restrained conditions of concrete is important to limit cracking risk. For this purpose, monitoring the evolution of an early age set of parameters on samples is necessary to predict the behavior of a real concrete structure built by phases. The civil engineering unit of the Service BATir at ULB has developed since several years innovative experimental tools for that purpose as well as models for early age concrete. Several PhD thesis are on going on that topic and can be extended.
Promoteur/Supervisor : Prof. Staquet Stéphanie
Email : sstaquet@ulb.ac.be
Site Web/Web site : http://batir.ulb.ac.be/research/lgc-civil-engineering.html
Centre de recherche/Research center : Service BATir
Faculté/Faculty : Faculté des Sciences appliquées - école polytechnique/Brussels School of Engineering (Faculty of Applied Sciences)
Ecole doctorale/Graduate Colleges : Sciences de l'ingénieur/Engineering
Ecole doctorale thématique/Graduate School (French Only): Graduate School in Mechanics(GraSMech)



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