Fix your mix

FixMix_loosemix_webBy Phil Blankenship, P.E.
How can we make our asphalt mixes better?

More specifically, what steps can be taken to improve durability, rut-resistance and crack resistance.

We look at three basic steps:

• Adjust the gradation to ensure adequate VMA (voids in mineral aggregate) and thus sufficient binder

• Allow for proper air voids in combination with VMA

• Understand and control the impact of RAP (reclaimed asphalt pavement) and RAS (reclaimed asphalt shingles) in our mix

Job story: Cold mix and collaboration

ColdMix_web_2016By Greg Harder, P.E.

For Cortland County, the Truxton-Tully Road project began in 2011 with the obtainment of proper right of ways, permits and the development of the pavement design. The 5.8-mile section of pavement was on track to be fully reconstructed beginning with full depth base stabilization and covered with 4 inches of hot mix asphalt (HMA).

But then the train came off the tracks. In 2013, the New York State Department of Transportation (NYSDOT) unveiled its new pavement management strategy “Forward Four” – the four guiding principles to ensure that NYSDOT is making good decisions in the efforts to preserve, maintain, operate and enhance the safety and condition of the state’s transportation system. The four principles include: