Pot Holes in Bitumen Roads Due to Heavy Monsoon

This is due to mainly corruption, contractor cut corner, using sub-standard material , inspector turn a blind eye. I have seen it in my home country (not Singapore) resulting in fast deteoration of road. A properly done bitumen road should not have too many pot holes.

They occur even on good roads during wet seasons, they can only be patched temporarilly until the the weather dries up. appens

poor roadbed prep prior to paving is the primary cause. use of gravel, followed by stabilized sand (sand/portland cement mix) and geocloth underlayment prior to paving will go a long way to prevent them. But the real fix is to use a properly designed steel rebar reinforced high strength concrete at least 8-10" thick with proper roadbed prep. instead of asphalt. Asphalt is porous and water will ALWAYS soak through, particularly where heat and high/heavy traffic have caused cracks. and when water gets under the road, the underlying foundation is washed out.

Potholes occur because of a failure of the subgrade. In climates with a lot of rainfall the subgrade must be designed for maximum drainage. Here in the northern parts of the US we can get by with 10" of clean stone but in India with monsoons you may need more than double that or even a pipe underdrainage system. Water under the pavement has to go somewhere and if the drainage path is blocked it has no where to go but up and thus a pothole is created.

..try to check the drainage of the patricular road,may be pot holes is the result of capilarity from the road foundation coming up the wearing coarse which results the top surface missing a proper tacking with a layer underneath,also to check with design weights and weight operating on the particular road way,also chech with the mode of maintanace and procedures they take during maintanance,aspecialy in the rainy environments,check also with material they are using on maintanance if they resemble in properties with parent one(if at all parent materials is of proper quality)...at least u can deduce sometghing out of these,else go further to check soil structures and constructability of the existing structure,CBRs etc...

Use waste plastics instead of bitumen as the binder for the aggregate and maximise drainage for the road foundation.