A Testing Method for a More Rational Evaluation of Expansion Due to the Alkali-Silica Reaction
By T. Kawakami, K. Yamada, Y. Kawabata and Y. Sagawa
Concrete Journal, Vol.62, No.12, Dec. 2024
- Synopsis
- Various measures have been implemented to address the alkali-silica reaction (ASR), but their inhibitory effects have not necessarily been evaluated quantitatively, and a method to more rationally evaluate ASR-induced expansion is desired. In response, this paper organizes a performance verification-based approach to controlling ASR, and discusses the significance of expansion prediction over time and the importance of improving the reliability of laboratory tests. It also summarizes the results of verification of the effectiveness of the alkali wrapping method, a method developed in Japan to control the problem of alkali leaching in accelerated expansion tests. The results show the tendency of expansion to continue over the long term, which had been overlooked by conventional methods, was observed, and confirmed that stable test conditions were maintained. This method, which provides more reliable expansion behavior, was shown to be useful in clarifying the expansion mechanism and improving the accuracy of expansion prediction.
- Keywords:
- Alkali-silica reaction, Quantitative expansion prediction, Concrete prism test, Alkali wrapping method
