Pavement Preservation Journal - Spring 2015 - (Page 29)

'Thinlay' Asphalt Overlays Next Word in Pavement Preservation KEEP IN RIGHT CONDITION Given the value of goods being transported over U.S. highways and roads, and the effect of road condition on costs, time and safety for the public, it is critical that our nation's highways and roads be kept in proper condition. Many agencies apply pavement preservation techniques to cost effectively maintain or improve roads in a good condition. Pavement preservation is defined in the current Moving Ahead for Progress in the 21st Century Act (MAP-21) which IMAGE CREDIT: TOM KUENNEN A s public works agencies and departments of transportation look to make the most efficient use of tight budgets, the National Asphalt Pavement Association is outlining the benefits of Thinlay thin asphalt mixes for pavement preservation. Thinlays constitute a suite of thin asphalt overlay mixes designed to be placed at thickness as thin as 5/8 of an inch. NAPA, working with state asphalt pavement associations and the National Center for Asphalt Technology, is testing several localized Thinlay mixes with a high level of recycled materials, which will be used to craft guidelines other states can use to develop sustainable thin overlays designed to best meet their local needs, conditions and materials. Thinlays offer the highest value to public and private pavement owners alike, according to NAPA. They share many of the benefits seen in asphalt overlays and inlays: extended pavement life, smooth ride, a modest improvement in pavement strength, enhanced safety, and responsible use of natural resources through reuse and recycling. Asphalt containing processed recycled asphalt shingles (RAS), shown here in stockpile at hot mix plant, should be permitted for Thinlay applications, as well as reclaimed asphalt pavement (RAP), according to NAPA was signed into law in July 2012, as "programs and activities employing a network level, long-term strategy that enhances pavement performance by using an integrated, cost-effective set of practices that extend pavement life, improve safety, and meet road user expectations." The precept of pavement preservation is that it is more cost effective to maintain pavements in good condition rather than allow pavements to deteriorate to such a condition that costly and time-consuming rehabilitation or reconstruction is the only recourse. A variety of pavement preservation techniques is available, among them Thinlays, which share many of the benefits seen in overlays and inlays. These include extended pavement life, smooth ride, a modest improvement in pavement strength, enhanced safety, and responsible use of natural resources through reuse and recycling. For road agencies, NAPA supports a well-funded asset management program, that includes pavement preservation as one of the tools available to ensure a desired state of good repair over the life cycle of a pavement at minimum practical cost. The focus for America's highway and road network has shifted from construction in the 1950s through the 1980s, to current maintenance and restoration efforts. America's road network is mature, with lane mileage due to new construction increasing only 8 percent from 1980 to 2009. MAP-21 recognizes that the nation's highway system is mature and that pavement performance must be monitored and maintained. Agencies will be required to report on road conditions to assure taxpayers that their money is being well Spring 2015 pavement preservation journal 29

Table of Contents for the Digital Edition of Pavement Preservation Journal - Spring 2015

President’s Message
Hot, Cold In-Place Recycling Gets Boost at Western States Conference
Fort Collins HIR Project Provides Delegates with Up-Close Look
NCAT Reports 2012 Cycle Results, 2015 Preservation Activities
New Congress Means New Push Toward Reauthorization
FP² at TRB
Pavement Preservation in Spotlight at World of Asphalt 2015 in March
Control Potholes by Sealing Cracks, Joints in Advance
‘Thinlay’ Asphalt Overlays Next Word in Pavement Preservation
Texas Considers Ultra-Thin HMA Alternatives to Seal Coats
Thin Overlays Can Preserve Pavements as Well as Reduce Surface Noise
In California, Scrub Seals Gain Favor for Cost, Crack Sealing
IGGA Recognizes Leaders in Grooving, Grinding
Index of Advertisers

Pavement Preservation Journal - Spring 2015