Anisotropy of swelling and elastic property loss due to Alkali-Silica-Reaction under loading

Author(s): L. Charpin, A. Ehrlacher
Paper category: Proceedings
Book title: Proceedings of the Seventh International Conference on Concrete under Severe Conditions – Environment and Loading
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 125-137
Total Pages: 13
Language : English

Abstract: Our article presents a study of the degradation of concrete under Alkali-Silica Reaction. We assume that the dense aggregates of a loaded concrete are attacked and progressively replaced by a swelling gel. Part of the gel escapes in the cement paste porosity but a pressure build-up still occurs. The pressure exerted first leads to decohesion between the aggregate and the cement paste, and second to a cracking of the cement paste. Microcracks are computed through an energy minimization algorithm, taking into account the effect of an external loading. The energy used is a modified poromechanics-type energy, taking the external loading and the reaction extent as state variables, which coefficients are determined through closed form solutions adapted from classical Eshelby solution-based micromechanics estimates. Hence, the anisotropic swelling, the decrease of Young’s modulus and resistance are explained through cement paste cracking.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00