What causes potholes?

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Good Question,
When moisture gets under the blacktop pavement in the winter it will freeze and expand. If it enough moisture it will heave and push the black top UP cracking and breaking the pavement then the cars running over it will pull the loose Blacktop out of the hole and there ya go..This is why you see the guys in the trucks sealing cracks in the fall.. Then you ask why don't they use something else, in reality the black color absorbs heat and dries much faster that concrete. A concrete surface is at least 15 Deg F cooler than a black top

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Ice has a lot to do with it. Water seeps into little cracks in the street and then freezes. The freezing water expands and breaks apart the asphalt. This happens over and over, and the soil or sediment beneath the asphalt shifts too, and sinks. And a pothole is born.

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If roads are laid with out proper scientific method, then potholes occurs. They have study the soil condition, movements of vehicles, load the truck carries. all has be considered before laying a proper road, Rains also play havoc. Hence four layer concrete roads, lasts longer than asphalted one.

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weak not packed dirt being drove over or rain could pack them down

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After ice breaks down the pavement, water that is in the hole is forced out very quickly by passing cars, since liquids aren't compressible the water is thrown from the hole taking pavement with it. this repeating process is how they get so big.

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Potholes are usually caused by water that gets up under the asphalt through cracks and it causes the base of the asphalt to buckle and give way to pressure. Big trucks then go over those spots and they crack and cause holes in those areas.

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freezing and thawing.the road breaks away.it starts with a little hole and just gets bigger.
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