Comprehensive Evaluation of Residual Expansion (RE) to Forecast Alkali-Silica Reaction (ASR) Affected Structures: RBC Overpass Case

Alkali-silica reaction (ASR) is among the most harmful deterioration mechanisms affecting concrete infrastructure worldwide, impacting more than 50 countries. Over the last decades, different laboratory tests have been developed to assess and forecast ASR-affected infrastructures for new structures. Meanwhile, laboratory techniques have evolved for reliably assessing deterioration mechanisms of existing structures in their cause and extent (diagnosis). There are, however, questions regarding a consistent protocol for prognosing ASR-affected structures, particularly in incorporating laboratory results to predict the remaining service life. In this context, this study examined different residual expansion (RE) methods within a forecasting protocol. While results showed variations in laboratory-induced expansion, extrapolations to field conditions resulted in similar ASR expansion rates. However, the reliability of these projections, crucial for accurate forecasting of ASR-affected structures, requires further validation through experimental studies and field observations.