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The Construction Thread

http://www.newscientist.com/blogs/onepercent/2012/06/road-repair-tech-sees-and-fill.html

Repairing cracks in roadways is a costly and time-consuming job. So researchers have come up with an automated system to fill cracks in asphalt, which covers more ground in less time and could save money by extending the life of a road.

The new method is an automated pavement crack detection and refilling system developed by Jonathan Holmes and colleagues at the Georgia Tech Research Institute (GTRI). The device, which attaches to a vehicle like a trailer, uses a stereo camera and light-emitting diodes (LEDs) to detect cracks in the road. Once a crack is identified, it is sealed while the vehicle moves at a mere five kilometres per hour.

GTRI research engineer Jonathan Holmes said that the system works like a dot matrix printer, which dispenses dots of ink onto a piece of paper that moves through a reel. In the case of the crack sealing system, the road is the moving sheet of paper and nozzles attached to the device fire sealant into the cracks.

The device is able to identify more than 83 per cent of the cracks in the road with a vision system that uses red and green LED lights that spots cracks smaller than three millimetres wide. The cracks are photographed and detected within 100 milliseconds of being spotted by the cameras and are then sealed.

The system has already been tested on a roadway in Georgia and in parking lots with cracked asphalt. Researchers are now fine-tuning the image processing software used to identify cracks and they plan on scaling up the device for use in a four metre wide section of road
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thør said:
A properly engineered pavement would have the cracks cut into it.
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construction and expansion joints in concrete work well and are pretty standard practice.

but this is talking about asphalt, or macadam. it's a softer material, so joints won't work the same way. what's weird about this article is that it only addresses cracks and not potholes. a big slow-rolling machine that repairs both seems like a better way to go.

then again, what do i know?
 
pete1968 said:
then again, what do i know?
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I really don't know.

However, I was on an asphalt pavement structure yesterday that was uniformly sawcut and sealed with no visible cracks between cut lines. I was impressed with the amount of effort expended in controlling contraction cracking.
 
the construction bit loses me.

i'm just glad to see you posting again.
 
cjh said:
the construction bit loses me.

i'm just glad to see you posting again.
Click to expand...

I was away from the inet for a couple of months. Come back and thought this place had finally up and died and gone to facebook. Good to see you too.
 
Lots of construction going on. For a town of about 50k, a huge amount of construction.
 
Windmills transform the mountain into an undead looking beast. Green energy sardonics, all the money and power flow down east.

A coal mine or two provide local employment -- they keep the lights on 'round here.

Class warfare mirrors an inanimate reality, ick.

Track number six.
 
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