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As part of an on-going research project, a model being developed to simulate ASR in concrete is described. The formulation consists of the three main diffusion/reaction field equations for the concentrations of Alkali, Calcium and Silicate ions in the pore solution, complemented by a number of evolution equations for the local ingredients involved (e.g. local concentration of reactive silica, local availability of portlandite, etc.).
A new experimental set-up to study the expansion mechanisms at the level of a single matrix-aggregate interface, using sandwich-like cylindrical specimens of cement paste/mortar and glass are exposed to 1 M NaOH solution at 60¿°C, is also presented along with typical free expansion curves and subsequent SEM images and EDX analysis of the reaction.
CitationLiaudat, J., Lopez, C., Carol, I. Free expansion tests for ASR at the level of a single aggregate-matrix interface: experimental results and numerical modelling. A: International RILEM PhD Workshop. "Durability of Reinforced Concrete from Composition to Protection Selected Papers of the 6th International RILEM PhD Workshop held in Delft, The Netherlands, July 4-5, 2013". Delft: Springer, 2015, p. 189-195.
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