ABSTRACT
Cracks were found in ten-year-old bridges along the Noto Satoyama Kaido (the former Noto Toll Road), which runs through Noto Peninsula, Ishikawa Prefecture. These were presumably caused by the use of ASR-reactive aggregate. Large-scale repair and retrofitting of these bridges began in 1998 with no established method being available. Repair and retrofitting related to ASR were also conducted later for many of these bridges along with seismic retrofitting as part of restoration work after the 2007 Noto Peninsula Earthquake. To ensure the effect of retrofitting, long-term monitoring of these bridges has been underway by installing crack displacement transducers, which have been monitoring cracking by automatic measurement for over 10 years. With the passage of 20 years since the first anti-ASR work, this paper analyses the results of inspection and monitoring, revealing that the retrofitting significantly reduced the expansion rate by ASR expansion
