Mother Nature is wicked to reinforced concrete pipes (RCPs): the freeze-thaw cycles may cause separations at the joints that allow soil to pass. Ultimately, this loss of soil will cause a dip in the pavement. Maintenance officials often are choosing RCP repair over replacement.
This RCP repair saved this county in Iowa money and traffic delays. The RCP joints were hand patched with grout and tied on the inside. The void surrounding the RCP was pressure grouted from the inside and then the concrete pavement was lifted back to original elevation.