Strategies for quantification of alkali metal release from aggregates in concrete

Author(s): Klaartje De Weerdt, Mette Geiker, Gilles Plusquellec, Jan Lindgård, Jose Duschene, Benoit Fournier
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 168-175
Total Pages: 813
Language: English

Abstract: Alkali silica reaction (ASR) is one of the major deterioration mechanisms for concrete. ASR takes place when the aggregates contain reactive silica, the concrete is exposed to moisture and sufficient alkali metals are available for the reaction. The main source of alkali metals in concrete is the cement. However, recent studies have indicated that the aggregates can release alkali metals. Due to the high volume share of aggregates in concrete even a relatively small release of alkali metals from aggregate could affect the free alkali metal content in the concrete considerably. Accelerated leaching methods are being developed to determine the potential release of alkali metals from aggregates. However, these methods might overestimate the actual released alkali metals in the concrete. There is a need to quantify the release of alkali metals from aggregates in concrete, and thereby verify the applicability of the proposed accelerated leaching methods. This paper gives an overview of different strategies and their limitation to investigate the alkali metal release by aggregates in concrete.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00