Abstract
Alkali-silica reaction is a mechanism of deterioration of concrete structures which is associated with the composition of the rocks used as aggregates. The assessment of aggregates to evaluate their potential reactivity to alkalis is made both by visual methods and laboratory expansion tests. There are a number of national standards regarding the petrographic examination of new aggregates but the identification of the features that are related with the reactivity is not always easy. Supplementary to the recommendation of the petrographic method, RILEM has developed in recent years a worldwide petrographic atlas aiming at providing information regarding the features typical of each rock type that might be involved in alkali-silica reactions. In this work, a presentation is made on the results of the petrographic study of about 70 samples received from 25 countries in all continents. The samples include rock fragments, sand and gravel, concrete from structures and from prims subjected to expansion tests.
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References
Sims I, Nixon P (2014a) RILEM AAR-0. Outline guide to the use of RILEM methods in the assessment of the alkali-reactivity potential of aggregates. Materials and Structures, vol 47. Springer, The Netherlands (in press)
Sims I, Nixon P (2014b) RILEM AAR-1.1. Detection of potential alkali-reactivity, Part 1: petrographic examination method for aggregates. Materials and Structures, vol 47. Springer, The Netherlands (in press)
Fernandes I, Broekmans MATM, Ribeiro MA, Sims I (2014) RILEM AAR-1.2. Petrographic atlas—characterization of aggregates regarding potential reactivity to alkalis. Springer Verlag, (in press)
Acknowledgements
The authors are grateful to everyone contributing to this work, especially including colleagues on RILEM TC 219-ACS. The authors affiliated in the CGUP are thankful to FCT for the funding in the scope of the Strategic Project PEst-OE/CTE/UI0039/2014 and also Project IMPROVE (PTDC/ECM/115486/2009).
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Fernandes, I. et al. (2015). Assessment of Concrete Aggregate for ASR Potential by Petrography. The Work Developed by RILEM TC-ACS (2007–2013). In: Lollino, G., Manconi, A., Guzzetti, F., Culshaw, M., Bobrowsky, P., Luino, F. (eds) Engineering Geology for Society and Territory - Volume 5. Springer, Cham. https://doi.org/10.1007/978-3-319-09048-1_6
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DOI: https://doi.org/10.1007/978-3-319-09048-1_6
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