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We have the same problem here in Malaysia. There are loads of potholes on roads, and they are barely visible when it rains.
Some of the roads are concrete, but most are tar. The thing is, the potholes appear on some tar roads, while others is it does not. One needs to look at the consistency on how roads are built.
Other than the material used, I believe the ground the roads are build on is a factor. In highways, I'm pretty sure they hardened the ground first somehow, perhaps by putting loads of gravel. But on small streets, they wont do this often. Ive noticed that they fix potholes caused by rain/car erosion by layering it with tar again. However, the new layer somehow "sinks" into the ground, creating a new pothole.
I also think drainage plays a role. Water settling too long on the road may cause some damage.
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koli
Member •
Jul 3, 2008
I know water is main reason to damage tar roads, but what i dont know is how it is managed in US, UK and other countries. There is some chemical composition or method which is different.
Any Chemical / Civil engineer want to comment with their expertise.
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BOBBY
Member •
Jul 4, 2008
anyone has any idea about design parameters of roads,
such as
1.angle of slant of roads to either sides (to counter rain water damage)
2.Parameters at the turnings .
(i found lot of holes formation at the turnings)
I observed rain damaging the edges of roads and gradually expanding to all over.How to take care of edges?any tech that can be used to minimise the damage.
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gohm
Member •
Jul 7, 2008
We don't have a monsoon time here in the US(nor UK). Instead some areas have damage due to frost heaves. These are bumps that are formed by the ground being thrust upwards from water freezing. Formula, base structure & compaction are all factors in road construction quality. Our roads are crowned (sloped away to both sides) and many have rain grooves to help expedite water run off. Many bridges & overpasses will use metal decking. Traffic itself is the largest cause of road surface damage due to high stress factors.
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In developed countries there are better surface or storm water or rain water drainage system. The roads are well drained and have sufficient culverts to allow the gravity flow of water. In developing countries like india roads are not provided with sufficient culverts, due to which they act as an earthen dam. Water in turn finds its way inside this earthen dam, creating voids like cavillary tube and get ruptured on passind on heavy vehicles. This lead to creation of local pot holes where road, base and sub base fails in carrying the vehicle load.
Other reason is mentioned by other of contractor not able to compact properly base and sub base of the road. Material used in road construction also play important role.
According to me many of this problem can be overcomed if the drainage system in designed properly.
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Thanks for the information, Dhaval. Designing a drainage sytem could be a solution for the new roads. What do you think we can do for the existing roads?
There must be a solution.
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gohm
Member •
Jul 11, 2008
Installing culverts in existing road decks is a fairly simple and cheap thing to do.
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gohm
Installing culverts in existing road decks is a fairly simple and cheap thing to do.
But where would the water flow after? I think drainage systems takes some planning. Its certainly very hard to install a drainage system in a super congested area without disrupting traffic, as well as whatever already exists right next to or under the roads, such as power and telecommunication lines, or foundations of other buildings.
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gohm
Member •
Jul 12, 2008
Don't you have storm drain infrastructure?! In the country it easily collects into ponds are streams. If there is no water runoff management system like storm drains or the like in the city then that certainly is the problem! The cart is before the horse.
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gohm
Don't you have storm drain infrastructure?! In the country it easily collects into ponds are streams. If there is no water runoff management system like storm drains or the like in the city then that certainly is the problem! The cart is before the horse.
Oh.. aren't we assuming there is no (or very ineffective) drain infrastructure for existing roads? *scratches head in confusion*
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gohm
Member •
Jul 12, 2008
Yes, I assumed that there may not be proper drainage infrastructure because of your post, though I initially guessed the drainage system was inpace first as it should be:
Ash- "But where would the water flow after? I think drainage systems takes some planning. Its certainly very hard to install a drainage system in a super congested area without disrupting traffic, as well as whatever already exists right next to or under the roads, such as power and telecommunication lines, or foundations of other buildings."
This would imply the infrastructure is not adequate or inplace. If that is accurate, then that problem would need to be addressed before the pavement issue. I had guessed the drainage system was there and so then normally with road expansion it is a simple matter of tying into the system & adding culverts. Working around buried cables and diverting traffic isn't to bad either, paving contractors do it all the time.
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I don't know about the technical complications involved but yeah all i know is the material being used to make roads these days by the contractors and all is of vry low quality..I just found this out in my area only The road was constructed some months ago.and now as its raining here the new road is in pieces..
So the root cause behind evrythng is Corruption..
everyone frm The highest CIvilor PWd enggineer to the contractor is corrupted !!!
GOd Plz save my country from these TERRORISTS!!!
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HI mates!!!....the situation in Mumbai is somewat diffrent than other cities in India,BMC(municipal corporation of Mumbai)are doing there job they have started making concrete roads and paver blocks at junction,as water clogging Rain water harvesting and other schmes have been introduced,KOLI i wud like you too observe the positives after all u shud be proud of this magical land
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*bump*
Oh boy how did I miss this thread. I'm a Civil Engineer after all. Anyway, building Concrete road is very good for the soil which has minimum internal movement. When the road is constructed, these guys make all attempts to consolidate the soil under the bed so that it doesn't allow water to seep below it. Other wise due to internal erosion, a part of the road may subside down leaving the Cement road permanently damaged. Moreover its very costly to construct this road as well as very time consuming.
Saurav I see you are from Mumbai. Look at the WE highway due to the contractor's inability to construct the road fast. He can't do much either because if he speeds up, there is every chance we will get a bad quality Cement road at a very high cost.
I guess Tar roads are the best as long as they are laid properly. Multiple layers with various size rubble might do the trick.
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Mayur,I agree with u since u have studeied the subject,but as per my observation Tar roads are much suseptible to water then concrete roads and driving fast is more riskeir in tar-road compare to concrete roads.As for water in low-lying areas it will logg no matter wat material the road is made of!!
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i have heard that roads that are laid using cement would last long
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Hi All,
I am in Coimbatore, India. The Government has turned our road upside down for underground drainage. Our soil is Clay, so when there are heavy rains, we are unable to walk on the roads since the clay sticks to the shoes and its very tough to remove those.
Could you please suggest me what type of sand we should spread so that we can use the road ?
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I agree with Ankur. The corruption at every level ensures that 3rd grade and cheapest raw materials are used. Call me a cynic but this is the cause. On paper the designs and everything are perfect....but it is never realised. The roads break each year and each year we have a statement from the authorities giving reasons that it was because of rains or heavy use. Seriously, were they thinking that people will not use it or did they believe the region is going to be devoid of rainfall for the next 50 years. The number of vehicles are going to increase and the environment factor will always be there.
The only reason why the roads are like that. The contractors pay bribe to get contracts. They use cheap material to make up for the spent money in bribes. And bad roads that break will ensure that there will be a fresh contract each year for grabs. The politicians don't want good roads because that is one of the things they have to promise during election time. The bureaucracy....... blah blah. It is a long vicious cycle which is and will be stuck in an infinite loop if we don't do anything.
Destroy this cycle and the roads will become good.
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I agree 100 % with patty!
And as some one said why we use tar roads and why not Concrete!
The reasons are:
1. Concrete roads are more costlier than Tar.
2. Concrete roads slows down the vehicles !!
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moksh
Member •
Nov 3, 2010
hmmm...hello everyone .. well the place where i live even if it rains for 2-3 days ,travelling on these roads become somewhat like a trecking expedition!!!!
well if you get a tar stain on your car the best solution is use petrol.....exactly guys
tar is soluble in PEtROL!!! so when it rains water along with petrol spills on the roads dissolves tar and eventually erodes ...
so generally it is hard to introduce any improvement on existing roads ,i.e in their design... but what we can do is make a certain standard of vehicle condition and allow only these vehicles to travel on highways ..
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is there something like rubber content in making the roads.................... and how to make the surface of the road water repellent??????
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