Title: Warm Mix Asphalt Technical Working Group (WMA TWG)
A WMA TWG was initiated by NAPA and FHWA. The mission of the WMA TWG is to evaluate and validate WMA technologies and to implement proactive WMA policies, practices, and procedures that contribute to a high quality, cost effective transportation infrastructure. The WMA TWG will foster an environment where transportation officials from government and industry share information on new, innovative, or proven WMA technologies and validate those technologies which will safeguard the transportation infrastructure of the United States and ensure that transportation funding and programs are efficiently and effectively utilized. The purpose of the WMA TWG is to proactively provide national guidance in the investigation and implementation of the concept of WMA technologies in the United States; to identify, review, validate, and provide technical WMA guidance that will provide a product with the quality, cost effectiveness and performance at least equal to conventional HMA with the benefit of reduced production and placement emissions; to discuss WMA technology problems and develop solutions to the problems. The WMA TWG is a group of individuals organized to discuss and individually respond to the subject of Warm Mix Asphalt. It is made up of representatives from the Federal Highway Administration (FHWA), the National Asphalt Pavement Association (NAPA), State Highway Agencies (SHA), State Asphalt Pavement Associations (SAPA), American Association of State Highway and Transportation Officials (AASHTO), the National Center for Asphalt Technology (NCAT), the Hot Mix Asphalt Industry, Labor, and National Institute for Occupational Safety and Health (NIOSH).

The WMA TWG submitted three high priority research needs statements that were combined into two projects by the National Cooperative Highway Research Program. Additional research needs statements have been submitted for consideration in fiscal year 2009.
Full Text URL: http://www.warmmixasphalt.com/

Title: NCHRP Project 09-43
The National Cooperative Highway Research Program (NCHRP) has approved research Project 09-43 "Mix Design Practices for Warm Mix Asphalt Technologies" for fiscal year 2007. The objective of this research project is to develop a performance based mix design procedure for warm mix asphalt in the form of a manual of practice.
Full Text URL: http://www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=977.

Title: NCHRP Project 09-47
The National Cooperative Highway Research Program (NCHRP) has approved research Project 09-47 "Engineering Properties, Emissions, and Field Performance of Warm Mix Asphalt Technologies" for fiscal year 2008. The objectives of this project are to (1) establish relationships among engineering properties of WMA binders and mixes and the field performance of pavements constructed with WMA technologies, (2) determine relative measures of performance between WMA and conventional HMA pavements, (3) compare production and laydown practices and costs between WMA and HMA pavements, and (4) provide relative emissions measurement of WMA technologies as compared to conventional HMA technologies.
Full Text URL: www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=1625