august 2017 revised fhwa hif 16 005 tech brief bases and subbases for concrete pavements this tech brief presents an overview of best practices for the design and construction of ...
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...August revised fhwa hif tech brief bases and subbases for concrete pavements this presents an overview of best practices the design construction its effects on performance background need use has been well known thousands years romans built over miles roads primarily to facilitate movement troops supplies beginning in about bc recognized benefits protecting natural earth subgrade from impact repeated loading their carts chariots such as appian way figure were constructed multiple layers stones subbase base surface sloped drain water away road photo near rome early had fairly thick s with asphalt cement bound thicknesses decreased shown loads applied a pcc typical thickness surfaced rigid pavement are spread large european designs area compared n flexible i permits thinner ne than k c hi t e wheel load ubba telford macadam b ad graph portland was originally used wooden blocks bricks cobblestones primary benefit using ability larger granular or bituminous materials thereby allowing build...