Comparative study of the alkali-silica reaction (ASR) in granitic aggregates
DOI:
https://doi.org/10.3989/egeol.40133.091Keywords:
alkali-silica reaction, mortars, granite, quartz, slow-reacting and rapid-reacting aggregatesAbstract
The reaction between certain reactive components of aggregates (like opal and metaestable silica) and concrete pore solution is well documented. Nevertheless, in this study it has been shown that some aggregates, like granite, could develop a rapid or slow alkali-silica reaction (ASR) depending on the deleterious component involved. Mortar bars were cast with two granitic aggregates extracted from concrete cores drilled in two Spanish Dams affected by ASR, being classified as granitic rocks. The main difference between them is the reactive component: microcrystalline quartz in one case and strained and microcracked quartz in the other case. A petrographic examination was carried out in the mortar bars. Thin sections were cut and the alkalisilica gel was stained for an easier detection. Then, the thin sections were examinated with a stereomicroscope comparing the differences in the progress of the ASR for both aggregates. It can be concluded that the main mechanism of formation and storage of gel is associated to the micro-cracks instead of the subgrain boundaries.
Downloads
References
Dolar-Mantuani, L.M.M. (1981). Undulatory extintion in quartz used for identifying potentially alkali-reactive rocks. Proceedings of conference on Alkali-Aggregate Reaction in Concrete. Pretoria. Surafrica. Paper S252/36.
Lorenzi, G.; Jensen, J.; Wigum, B.; Sibbick, R.; Haugen, M.; Guédon, S. & Åkesson, U. (2006). Petrographic atlas of the potentially alkali-reactive rocks in Europe. Profesional paper N. 302. Geological Survey of Belgium. Bruselas, Bélgica. 63 pp.
Ponce, J.M. & Batic, O.R. (2006). Different manifestations of the alkali-silica reaction in concrete according to the reaction kinetics of the reactive aggregate. Cement and Concrete Research, 36: 1148-1156 doi:10.1016/j.cemconres.2005.12.022
Poole, A.B.; McLachlan, A. & Ellis, D.J. (1988). A simple staining technique for the identification of alkalisilica gel in concrete and aggregate. Cement and Contrete Research, 18: 116-120 doi:10.1016/0008-8846(88)90128-7
RILEM (2003). Recommended test method AAR-1. Detection of potential alkali reactivity of aggregates. Petrographic method. Materials and Structures, 36: 480-496.
St John, D.A.; Poole, A.W. & Sims, I. (1998). Concrete petrography. A handbook of investigative techniques. Elsevier Butterworth-Heinemann, Oxford, 488 pp.
Streckeisen, A.L. (1974). Classification and Nomenclature of Plutonic Rocks. Recommendations of the IUGS Subcommission on the Systematics of Igneous Rocks. Geologische Rundschau. Internationale Zeitschrift für Geologie, 63: 773-785.
Wigum, B.J. (1995a). Alkali-Aggregate reactions in concrete. Properties, classification and testing of Norwegian cataclastic rocks. PhD Thesis. University of Trondheim, 221 pp.
Wigum, B.J. (1995b). Examination of microstructural features of Norwegian cataclastic rocks and their use for predicting the alkali-reactivity in concrete. Engineering Geology, 40: 195-214 doi:10.1016/0013-7952(95)00044-5
Wigum, B.J. & French, W.J. (1996). Sequential examination of slowly expanding alkali-reactive aggregates in accelerated mortar bar testing. Magazine of Concrete Research, 48: 281-292 doi:10.1680/macr.1996.48.177.281
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2010 Consejo Superior de Investigaciones Científicas (CSIC)
This work is licensed under a Creative Commons Attribution 4.0 International License.
© CSIC. Manuscripts published in both the print and online versions of this journal are the property of the Consejo Superior de Investigaciones Científicas, and quoting this source is a requirement for any partial or full reproduction.
All contents of this electronic edition, except where otherwise noted, are distributed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. You may read the basic information and the legal text of the licence. The indication of the CC BY 4.0 licence must be expressly stated in this way when necessary.
Self-archiving in repositories, personal webpages or similar, of any version other than the final version of the work produced by the publisher, is not allowed.
