High volume asphalt moratorium lifted
By Mark Blow, P.E.
High volume routes constructed with asphalt pavement in the Minneapolis/ St. Paul (MSP) metro area have historically been few and far between.
The fine sand and gravel mixes that used unmodified asphalt binder did not last under the high traffic loads and higher tire pressures. A 2001 Minnesota Department of Transportation (MnDOT) technical memorandum governing the pavement selection and pavement design standards actually prohibited the consideration of asphalt pavement on routes with 20-yr ESALs (equivalent single axle loads) over 10 million. (more…)