Analytical modelling to describe alkali-agregate reaction (AAR) induced expansion

Author(s): N. Goshayeshi, L. F. M. Sanchez, A. C. D. Santos, R. Gorga
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 214-221
Total Pages: 813
Language: English

Abstract: Alkali aggregate reaction (AAR) is one of the most harmful distress mechanisms affecting the durability of aging concrete structures worldwide. Currently, there is a need to forecast the future behaviour of AAR-affected concrete and thus analytical and numerical models have been developed over the years. Larive developed an analytical model able to describe the behaviour of concrete specimens in the laboratory. This model has been widely accepted and used by AAR
community, even to predict the behaviour of concrete structures in the field. Larive’s model is based upon three main parameters, and although they are normally set according to the given concrete mixture/structure under analysis, there is currently a lack of understanding on the variation of those parameters as a function of the initial potential reactivity of the material. This work aims to calibrate Larive’s equation according to the aggregates type and reactivity so that predictions may be performed based on the reactive potential of the mix. First, a comprehensive laboratory testing campaign using a variety of concrete strengths and aggregate types is conducted. Second, Larive’s model is matched with laboratory data and a discussion on the main parameters of the equation is performed. Finally, the model is used to appraise the expansive behaviour of blocks containing the same mix-design and reactive aggregates exposed outdoors in Ottawa, Canada.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00

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