I don't doubt that subbase and drainage may be at play here. However, in order to provide meaningful input and help determine the cause(s) of failure, it is important to begin, not with a conclusion ("Roads in my locality have been constructed without proper GSB"), but with some questions:
- What kinds of failures have occurred and when do the failures first manifest themselves? Photos of some typical failures would be very helpful in diagnosing the problem.
- What are the environmental factors in your area (rainfall, temperature ranges, etc.)?
- What kind of traffic are these pavements subjected to?
- What are the typical overall pavement cross-sections, including the material and range of thickness of each pavement layer?
- What are the subgrade characteristics?
- How is the subgrade graded?
- What provisions have been made both for surface and subsurface drainage? Jennifer's comments are right on point.
------------------------------
Fernando Souto P.E., M.ASCE
Senior Project Manager
Cadillac MI
------------------------------
Original Message:
Sent: 10-21-2017 00:58
From: Rahul Sreedhar
Subject: Granular subbase drainage
Roads in my locality have been constructed without proper GSB and the pavements are failing very fast... Is there a way in which such roads can be provided drainage facilities. I have also attached the GSB gradations used in my country below. Can someone please check it because roads with gsb are also failing due to permeability problems of GSB layer.
------------------------------
Rahul Sreedhar S.M.ASCE
India
------------------------------