Does polyurethane, used by injection method to seal leaking cracks, break down over the longer term? My application is a tunnel lining, so UV and thermal changes are not issues. Cracks are likely to move slightly due to seasonal humidity changes (established as max 0.3mm. Crack widths are mainly fine, up to 1mm). Water pressure is likely to build up at the positive face. Does anyone know whether creep or aging or other effects would be likely to reduce the long term performance? Advice appreciated, as net surfing hasn't helped with this one.
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