300984 Lecture Notes - Lecture 4: Subgrade, Asphalt, Road Slipperiness
27 May 2020
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Document Summary
With time, wear and tear of surface of a road takes place. If no proper care is observed then the road will fail before time/designated life. If road fails then either it has to be repaired or reconstructed. First of all, the cause of failure has to be established. No maintenance can be properly carried unless causes of failure are known. Failure of a flexible pavement is indicated by depressions or settlements, waves, corrugations, and ruts in the road surface. The cause of road failure may be the failure of subgrade, sub- base, base or wearing surface. Excessive plastic deformation of the subgrade soil can result into waves, corrugations and ruts in the road surface. Ruts are formed along the path followed by the wheels of the vehicles if vehicles use the same portion of the pavement every time. Ruts formation is mainly due to consolidation settlement/deformation. ruts.
