The hard problem in road surfaces is not the sitting outside for 20 years. Glass, even cheap crappy glass, handles this last just fine; see windows in houses. The hard problems are dealing with repeated time-varying mechanical stress and dealing with thermal expansion (windows can play fast and loose with this by leaving expansion space around the glass inside the frame).
The hard problem in road surfaces is not the sitting outside for 20 years. Glass, even cheap crappy glass, handles this last just fine; see windows in houses. The hard problems are dealing with repeated time-varying mechanical stress and dealing with thermal expansion (windows can play fast and loose with this by leaving expansion space around the glass inside the frame).