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I-96 (north of Detroit) was recently repaved in concrete using the "european method" of putting down many layers of a solid base to build upon.
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That is called 50 years pavement in the industry... or at least in this hood
A well prepared base, then 300 mm of sub-base 150mm of "popcorn" which is a
drain-able base the 300mm of reinforced concrete with utility isolations
Basically 2-1/2 feet of well controlled pavement... Thickness does vary, I worked in northern Vermont for a year and the base was considerably thicker