Silica dissolution in impure sandstone; application to concrete

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doi: 10.1016/S0375-6742(97)00034-4
Authors:Broekmans, M. A. T. M.; Jansen, J. B. H.
Author Affiliations:Primary:
Norges Geologiske Undersokelse, Avdeling Losmassegeologi, Trondheim, Norway
Other:
Bowagemi, Netherlands
Volume Title:Geochemical engineering; current applications and future trends
Volume Authors:Vriend, Simon P., editor; Zijlstra, Hans J. P.
Source:Journal of Geochemical Exploration, 62(1-3), p.311-318; Geochemical engineering; current applications and future trends, Utrecht, Netherlands, Aug. 22-23, 1997, edited by Simon P. Vriend and Hans J. P. Zijlstra. Publisher: Elsevier, Amsterdam-New York, International. ISSN: 0375-6742
Publication Date:1998
Note:In English. 27 refs.; illus., incl. 3 tables
Summary:Dissolution and leaching of silica in concrete aggregate leads to structural deterioration by the hygroscopic and swelling properties of the resulting gel, causing cracking of the concrete. The process is referred to as ASR: alkali-silica reaction. In Dutch concrete with relatively alkali-rich ordinary Portland cement (OPC), chert pebbles are regarded susceptible to ASR owing to their fine-grained microstructural features and low crystallinity. The damage in the three concretes presented in this study, however, is caused by reaction of fine-grained sandstone containing muscovite and interstitial clays. Despite the coarser microstructure and higher crystallinity, sandstone reacts more violently than chert in the same samples. Petrographical observations on reactive sandstone coincide with recent descriptions of catalyzed silica dissolution in diagenetically altered sandstones. Low Na2O-equivalents decrease even further with increasing degree of cracking. The combination of low bulk alkali content, microscopical characteristics of the reactive sandstone, and resemblance to catalyzed quartz dissolution in diagenetic sandstones strongly suggests that a similar mechanism of catalyzed dissolution could play a significant role in ASR-induced aggregate deterioration in concrete. Abstract Copyright (1998) Elsevier, B.V.
Sections:Environmental studies
Subjects:Chemical reactions; Clastic rocks; Clay mineralogy; Concrete; Construction materials; Diagenesis; Experimental studies; Geochemistry; Laboratory studies; Mineral composition; Oxides; Petrography; Porosity; Rock mechanics; Sandstone; Sedimentary rocks; Silica; Solution; Weathering
Abstract Numbers:99M/3694
Record ID:1998054530
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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