Re:Iowa Makes a Bold Admission: We Need Fewer Roads
by vonmoltke on Thursday July 09, 2015 @04:45PM
(#9860564)
> And requires an underlying concrete layer to lengthen it's lifetime
Depends on the underlying soil. In north Texas it's common when asphalt is laid to pour a Portland cement concrete base, though many roads and highways are just straight concrete. In south Florida, the roadbed is usually just packed limestone, because the land has a rock layer no more than 50 feet down and the sandy soil is pretty incompressible, unlike the constantly expanding and contracting clay in Texas.
Depends on the underlying soil. In north Texas it's common when asphalt is laid to pour a Portland cement concrete base, though many roads and highways are just straight concrete. In south Florida, the roadbed is usually just packed limestone, because the land has a rock layer no more than 50 feet down and the sandy soil is pretty incompressible, unlike the constantly expanding and contracting clay in Texas.