Specification Corner

Colorado DOT
We did not have any significant changes to our specifications this past year.

Florida DOT
FDOT is incorporating incentives and disincentives based on pavement smoothness as measured by the laser profiler and evaluated with the International Roughness Index (IRI). This specification will be for use on interstate and limited access roadways.

Warm mix asphalt has been formally defined. A mixture containing an unmodified binder will be considered a warm mix asphalt design if the mixing temperature is 285oF or less. For mixtures containing a PG 76-22 or high polymer binder, a mixture will be considered a warm mix asphalt design if the mixing temperature is 305oF or less.

Minnesota DOT
MnDOT has fully implemented multiple stress creep recovery (MSCR). We are also using thermal profiling on all HMA jobs.

Montana DOT
Montana has no significant changes for 2018.

Nebraska DOT
We are focusing on increased in-place compaction density for improved long term performance.

Ohio DOT
We had significant changes to our micro surfacing specification in January 2018, which includes adding quality control (QC) requirements, QC plans, a more defined calibration procedure, mix design requirement changes, and mix paver equipment requirement changes.

We are continuing trial projects to evaluate void reducing asphalt membranes (VRAM), to evaluate thermal imaging for thermal segregation, and to evaluate a finer 19 mm asphalt mix to increase AC and reduce segregation in our intermediate courses.

Tennessee DOT
TDOT is implementing intelligent compaction on selected projects including all interstates for the 2018 paving season. At this time, this specification only includes tracking temperature/location and is primarily focused on implementing the technology as a quality control tool.