|dc.description.abstract||The Bibb Graves Bridge in Wetumpka, AL has severe damage due to
alkali-silica reaction (ASR) in two of its reinforced concrete arches. A mitigation
procedure developed in the summer of 2010 by the FHWA, ALDOT, and Auburn
University was implemented during the fall of 2010. The mitigation procedure
included the application of a silane sealant, flexible sealant in the large cracks,
and an epoxy flood coat to fill the small cracks on the tops of the arches.
For this research, the internal relative humidity and external concrete
strains in the aches of span 4 and 5 were monitored and analyzed to determine
the effectiveness of the ASR mitigation procedure. Additionally, time frames in
which results from the ASR mitigation procedure may be seen were determined
through analytical methods.
It was found that over the 18-month data collection period, the ASR
mitigation procedure was not effective at lowering the relative humidity to a level
such that ASR expansion slowed.||en_US