NCDOT Culvert Inspection Team Uncovers History
Crews inspecting a culvert scheduled for replacement under N.C. 200 in Cabarrus County, North Carolina, found it contained an unusual combination of materials: About a third each of cut granite, arched terra-cotta block – also called tile – as well as corrugated metal pipe; with the pipe, interestingly enough, the most deteriorated section of the culvert, despite it being the most modern of the culvert's materials....
machineryasia 
Crews inspecting a culvert scheduled for replacement under N.C. 200 in Cabarrus County, North Carolina, found it contained an unusual combination of materials: About a third each of cut granite, arched terra-cotta block – also called tile – as well as corrugated metal pipe; with the pipe, interestingly enough, the most deteriorated section of the culvert, despite it being the most modern of the culvert's materials....
