Hot Mix Asphalt Technology - September/October 2008 - (Page 9)

PRESIDENT’S PERSPECTIVE R ecently NAPA provided a report to the House of Representatives Subcommittee on Technology and Innovation. In the report we outlined a number of the qualities of asphalt that recommend it as a sustainable, environmentally friendly material, including the following: Recycling. Asphalt pavement is America’s most recycled product. Each year, our industry helps reclaim 100 million tons of asphalt and reuses or recycles 95 percent of that total. Recycling saves precious natural resources and reduces the carbon footprint of pavement construction. About 75 million tons of reclaimed asphalt pavement is mixed with virgin materials and incorporated into new asphalt pavement. This is called the highest and best use because the asphalt cement in the old pavement is reactivated, becoming part of the binder for the new pavement and replacing some of the virgin binder that would otherwise be required. Reducing congestion. Highway work zones reduce the capacity of a road to handle traffic, especially during rush hours. Asphalt pavements can be designed so that they only need periodic resurfacing, and the work to accomplish this can be scheduled during non-rush hours, facilitating the movement of vehicles through the work zone, reducing fuel consumption, and improving safety. Since asphalt does not need to cure to have the strength to support traffic, new or newly rehabilitated pavements can be quckly reopened to traffic. Safety. Open-graded asphalt surfacings are widely used on highways to enhance safety. Ensuring the safety of our highways is always a top priority with our members and agencies alike. Using porous friction courses on pavement surfaces helps to eliminate tire splash and spray in rainstorms. Not only does this enhance tire-to-pavement contact, and therefore safety, it also improves drivers’ visibility. In a high-accident area in Texas, replacement of a typical non-porous surface with porous friction course reduced wet weather accidents by 93 percent and reduced facilities by 86 percent. Porous asphalt pavement. The same open-graded pavement type that is used to surface highways can also be used in porous asphalt pavement systems for stormwater management. Placing a porous asphalt pavement on top of a recharge bed allows stormwater to percolate through the pavement into the recharge bed, where it is stored until it can infiltrate into the soil. Porous asphalt pavements decrease runoff and increase filtration, improving water quality. Rubblization. When confronted with reconstruction or major rehabilitation of a concrete pavement, rubblization of in-place concrete with an asphalt overlay is the easiest, lowest cost, and most effective way to rehabilitate the pavement in the shortest amount of time. The state of Arkansas estimated that it saved $1.3 million per mile on rubblization projects totaling over 318 miles as compared to removing and replacing the existing concrete pavement. However, rubblization’s benefits go beyond just the considerable money saved in construction; it also saves time and money for road users because they spend less time in traffic during the rehabilitation of the road. By Mike Acott NAPA Sets the Record Straight About Asphalt Hot Mix Asphalt Technology – SEPTEMBER/OCTOBER 2008 • 9

Table of Contents for the Digital Edition of Hot Mix Asphalt Technology - September/October 2008

Hot Mix Asphalt Technology - September/October 2008
President’s Perspective
Industry News
Selecting PG Binder Grades for Airfield Pavements
“We’re Looking for Quality Airfield Pavements at a Fair Price”
Logan International Airport Project: Secure Site Leads to Successful Paving
Michigan Paving Industry Reinvigorates Scholarship Program
Scholarships in Iowa: Remembering the Past, Investing for the Future
International Corner
Tools for the Trade
Calendar of Events
Index of Advertisers
Quality in Construction Award Winners
HMAT Buyers’ Guide

Hot Mix Asphalt Technology - September/October 2008