fried1765
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- Jan 6, 2015
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The State Dept of Transportation is like that here. They LOVE to plane up all the hot top, then put gravel back down, then pave, and they wonder why the road lasts 10 years instead of 30.
I asked the State Engineers why don't they just put gravel over the hot top and build the road up? Traffic has been compacting the road base for years. When you build a home, you leave the soil under the footing undisturbed as much as possible so that it is on a firm bedding.
They told me it was so "water can get down through the roadbase, and hot top would stop it."
Apparently they do not look at the road when they are driving on it, because in the Spring of the year when the frost goes out, water comes UP through the road, so I would think if it could come UP through, it surely would go down through! Instead they spend millions grinding out the roadbed, hauling it off, and then hauling in new gravel that is not compacted nearly as well.
I just shake my head...
If the base contains clay material, gravel on top and/or more hot mix will not solve the problem long term.
The base must be removed, and replaced with compacted very permeable (gravel) material, to allow the water that finds it's way underneath the roadway to drain away naturally.
A Maine Winter, will heave any number of layers of hot mix, if the road base is not well drained.