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Alkali-silica reaction in finnish swimming pools

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Details

Original languageEnglish
Title of host publicationProceedings of the fib Symposium 2019
Subtitle of host publicationConcrete - Innovations in Materials, Design and Structures
EditorsWit Derkowski, Piotr Krajewski, Piotr Gwozdziewicz, Marek Pantak, Lukasz Hojdys
PublisherInternational Federation for Structural Concrete
Pages2006-2013
Number of pages8
ISBN (Electronic)9782940643004
Publication statusPublished - 2019
Publication typeA4 Article in a conference publication
Eventfib Symposium -
Duration: 1 Jan 2000 → …

Publication series

Namefib Symposium Proceedings
ISSN (Electronic)2617-4820

Conference

Conferencefib Symposium
Period1/01/00 → …

Abstract

Finland has traditionally been considered an alkali-silica reaction (ASR) free country. This was thought to be due to the exceptional quality of the mostly coarse crystalline igneous rocks. However, during the last few years dozens of cases of ASR have been reported. The scope of this study was to survey the occurrence and the propagation time of ASR in recent investigations of swimming pool structures. The research data consists of 9 condition investigation reports, and the reports of 144 thin section analyses, 188 tensile strength analyses and 29 compressive strength analyses made during 2005-2018. According to the research data, the occurrence of ASR is spread all over Finland. The reacting aggregates consist of rock types which are considered relatively stable or low reacting in literature. This may explain the relatively late emergence, usually around 40 years, of ASR. However, the swimming pool environment, with relatively high temperatures and humidity, is more favourable for ASR than the average Finnish outdoor climate. In most cases ASR has been incipient. Only few of the tensile strength tests made have indicated local weathering in the leaking concrete pool. ASR can be reliably detected in a petrographic thin section analysis, but evaluating the degree of ASR -caused damage also requires tensile strength testing. Observations of silica gel, or reacting aggregate, do not necessarily indicate serious damage or direct correlation with the degree of cracking. Therefore, parallel test methods, i.e. thin section analyses and tensile strength tests, are needed to diagnose the ASR in a concrete structure and the possibility of repair.

Keywords

  • Alkali-silica reaction, Concrete, Concrete petrography, Initiation time, Swimming pool

Publication forum classification

Field of science, Statistics Finland