What am I looking for? First, I look at the construction. The common in-pavement structures are sanitary sewer manholes, stormwater inlets and catch basins, and utility vaults such as electric and telephone/fiber optic. Concrete pipe is common construction. Older manholes can be constructed of brick and mortar. At the top of the structure can […]
Tag Archives: Under Drains
Pavement Performance: What is Going on Here?
From a cursory glance of the photograph, you could think mud had dropped from a pickup truck. An experienced engineer see that the light-colored markings are mineral fines (the powdery portion of crushed rock) being leeched out of the pavement structure by subsurface water pressure. The source could be, excess […]