Alkali-silica reaction (ASR)-performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on alkali leaching and prism expansion
Lindgård, Jan; Thomas, Michael D.A.; Sellevold, Erik Johan; Pedersen, Bård; Andiç-Çakır, Özge; Justnes, Harald; Rønning, Terje F.
Journal article, Peer reviewed
Accepted version
Permanent lenke
http://hdl.handle.net/11250/2502605Utgivelsesdato
2013Metadata
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Originalversjon
Cement and Concrete Research. 2013, 2013 (53), 68-90. 10.1016/j.cemconres.2013.05.017Sammendrag
Whether or not concrete prism tests developed for assessment of alkali-silica reactivity of aggregates might be suitable for general ASR performance testing of concrete has been evaluated. This paper discusses how variations in specimen pre-treatment, ASR exposure conditions and prism size influence the rate and amount of alkali leaching and prism expansion, together with a discussion of consequences for ASR test procedures. Furthermore, results from some complementary tests are included.
Generally, a remarkably high proportion of the in-mixed alkalis was leached out of the concrete prisms during the ASR exposure. For prisms exposed to 60°C, the rate and amount of alkali leaching is the main controlling factor for the prism expansion. For less permeable concretes exposed to 38°C, lack of internal moisture and lower rate of diffusion contributes to reduce the rate and extent of ASR expansion (reported in a separate paper).