Mix Optimization

Better Roads Staff - May 06, 2013

A formula for greenbacks and green roads To avoid fracturing aggregates when compacting stone matrix asphalt (SMA) or open-graded mixes, it may be necessary to use two rollers set in low amplitude during the breakdown phase. When it comes to mix-design ...

Perpetual Pavement an Inch at a Time

Better Roads Staff - Dec 01, 2012

NATIONAL ASPHALT PAVEMENT ASSOCIATION NAPA SPECIAL FEATURE Perpetual pavement is a concept that was developed and has traditionally been marketed for high-volume applications like freeways and interstates. There is no reason, however, that this life-extending design approach can’t be applied to lower-volume ...

NAPA Webinars Nov. 15: ‘Election Implications for Asphalt Contractors’ (free) and ‘Upping the RAP – Putting Research into Practice’

Tina Grady Barbaccia - Nov 14, 2012

The National Asphalt Pavement Association (NAPA) is hosting two webinars (one of which is free) on Nov. 15 – Election Implications for Asphalt Contractors and Upping the RAP – Putting Research into Practice at noon and 2 p.m. EDT, respectively. Election Implications for ...

Fast Forward

Better Roads Staff - Feb 17, 2012

AASHTO’s TSP•2 Program Speeds Acceptance of Technologies, Materials A technology transfer program administered by the American Association of State Highway & Transportation Officials (AASHTO) is helping state departments of transportation expedite review of potentially promising new pavement and bridge technologies prior ...

Road Science Tutorial

Brooke Wisdom - Sep 01, 2010

One and One is One Two lifts can become a single, strong layer. By Tom Kuennen, Contributing Editor With two-lift hot mix asphalt paving, it’s a case of 1+1=1. As more durable hot mix asphalt pavement designs are explored in the United States, two-lift ...