Archived WGs' pages

Remark: Outdated content from old website ““. The workgroups’ sub-pages have been combined into this archive-page.
–2018-07-01, S. Reiser

Work Groups

WG 1 – Hot Recycling of RAP (^)

Chairman: Elie Hajj

Strategic Plan


The mission of the Recycled Asphalt Pavement (RAP) Working Group is to encourage the use of RAP in asphalt pavements throughout the world. By advancing the recycling technology, the overall cost of road construction will be significantly reduced at the same time environmentally friendly roads will be constructed.


The use of RAP in asphalt mixtures throughout the world will be increased to 30% within the next 10 years and to 50% within the next 15 years. Fundamentally sound and practical procedures will be available to effectively evaluate the properties of RAP materials and to optimize the design of asphalt mixtures containing RAP. Within the next 15 years, hot mixing plants with capabilities of using high RAP contents will be readily available with environmentally friendly technologies.

Short Term Goals

1. Encourage cooperation among researchers on the use of RAP materials.
2. Develop a database that incorporates all active research efforts on the use of RAP materials in asphalt mixtures.
3. Organize an international conference on the use of RAP materials in asphalt mixtures.
4. Conduct Workshops and/or prepare circular on new technologies, equipment, and testing procedures that can help evaluate RAP mixtures.
5. Forge liaisons from the ISAP-RAP WG to other groups addressing RAP – such as, TRB committees, ASCE, Pooled Funds, etc…

Long Term Goals

1. Develop world-wide guidelines on the evaluation of RAP materials and the design of asphalt mixtures containing RAP.
2. Partner with equipment manufacturers to design and deliver asphalt plants that can accommodate high RAP contents.
3. Develop a process to show the life cycle benefits of using RAP in asphalt mixtures.


WG 2 – Cold Recycling of RAP (^)

Chairman: Kim Jenkins
Secretary: Alessandro Marradi

Topics of WG activity:

  • mix design approaches in various countries
  • structural design approaches in various countries (including distress mechanisms)
  • research databases and information sharing
  • focus areas for future research

WG 3 – Life cycle analysis (^)

Chairman: John Havey
The Life Cycle Assessment (LCA) sub-working group is working to improve the state of practice of LCA for pavement and enhance the environmental sustainability of asphalt pavement through the use of LCA in decision-making for pavement design and asset management.
Life Cycle Assessment (LCA) is an approach to quantify the environmental impacts of industrial products and processes, and part of an LCA’s value lies in its capacity to provide decision makers with a comprehensive perspective for considering new projects. In 2009, the UCPRC began work with national and international partners to develop a framework for LCA for pavement. The goals of this project are to develop a tool for performing pavement LCA and to provide government policy makers with new insights for decisions concerning pavement projects and policy.
Participants in a May 2010 workshop discussed the proposed pavement LCA framework and addressed key questions about how to practice LCA and how apply its results. Two publications resulting from the workshop are now available for download and comment: the UCPRC Pavement LCA Guideline and the UCPRC Pavement LCA Workshop Discussion Summary. The Guideline provides basic instructions for pavement LCA studies and to satisfy the study’s transparency requirement. The Summary synopsizes key questions and discussions about LCA practice and decision-making regarding the framework developed during the workshop.
The study’s two next steps include development of a pavement LCA model based on the proposed framework and data source, and use of this model to support decision-making regarding initial policy questions. This work is funded by Caltrans and the University of California Multi-campus Research Programs and Initiatives (MRPI) program. This work is also part of the MIRIAM (Models for Rolling Resistance in Road Infrastructure Asset management Systems) project, a California and European consortium that focuses on the optimization of road surfaces to minimize total fuel consumption.
For more information, please visit our website at:

WG 4 – New technologies and special environmental aspects for asphalt pavements (^)

Chairman: Gordon Airey
Secretary: Ellie Fini
The mechanical performance as well as the environmental and sustainable issues associated with asphalt pavements are fundamentally linked to the micro- and nano-scopic, physico-chemical properties of the material. There is therefore an overriding need to consider technologies outside those currently associated with asphalt materials in order to enhance the positive role that asphalt materials play in meeting the demands on a modern society.
The activities of this WG are closely linked to the recycling activities of other ISAP technical committees as well as the activities of RILEM Technical Committee TC 231 NBM Nanotechnology-based Bituminous Materials and the newly formed RILEM Technical Committee TC CMB Chemo-Mechanical Characterization of Bituminous Materials.
The goals of WG 4 are to:

  • Establish an interface between pavement engineering and pavement materials and other disciplines, and
  • Identify the opportunities to produce asphalt paving type adhesives
  • from bio-mass and other sustainable sources.

The following areas/themes will be included in this WG:

  • Environmental & sustainable pavement technologies and materials,
  • Cross-disciplinary technologies and expertise,
  • Bio-binders and synthetic binders

WG 5 – Shingle Recycling (^)

Chairman: Gerry Huber

WG 6 – By-products and Secondary Materials Recycling in Asphalt Pavements (^)

Chairman: Marco Pasetto


The objective of the WG6 is the promotion of use of alternative materials (industrial by-products and secondary materials) in road asphalt pavements constructions. Disposal of industrial by-product or secondary materials is becoming one of the most important topics worldwide. One of the option is their application in road construction. It may reduce the consumption of natural aggregates, and, on the other hand, saving the landfill areas.
Worldwide process to increase the use of alternative materials is driven by administrative pressure, for instance by means of taxes (on materials sent to landfill or on natural aggregates). It stipulates the use of alternative materials.
Use of alternative materials in the asphalt road pavements requires consideration of environmental as well as technical aspects. Alternative materials need the evaluation of impact on environment as well as mechanical properties to meet the requirements established for natural materials. In many cases of alternative materials specific tests and requirements are requested. New developments in the research area in road construction provide functional, performance based test methods of materials, which may allow for more objective alternative material evaluation in comparison to natural material.
Appointment and promotion of those test methods will be the objective of WG6 as well.

Basis of work

The basis of work of WG6 will be literature review, and monitoring the development in Technical Standards, Specifications, Guidelines, and Law Regulations. Special attention will be given to international collaborative projects completed such as:
Marginal materials. State of the Art report. Permanent International Association of Road Congresses, Paris, PIARC (1989)
Recycling strategies for road works. OECD (1997)
ALT-MAT a collaborative research project partly funded by the European Commission under Framework Programme IV (1998-1999)
SAMARIS (Sustainable and Advanced MAterials for Road InfraStructure) project, funded by the European Commission under the Fifth Framework Programme (2003-2007).

The Goals

  • Up-to-date literature review, including development in standards and law regulations – based on international inquiry.
  • Workshop on by-products and secondary materials in asphalt pavements (date and venue will be decided later).

WG 7 – Energy Harvesting (^)

Chairman: K. Wayne Lee


The urban cityscape is filled with man-made materials that absorb the suns light. Darkly colored roads and roofs have replaced surface area which was once predominantly vegetated lands. Many of these man-made surfaces are also impermeable and typically dry. For these reasons summertime ambient temperatures in cities are typically warmer than those of rural areas. On a sunny summer day city temperatures can be up to 4oC (8°F) higher than rural areas. This phenomenon is known as the heat island effect and it can have several negative impacts to the environment and human health.
Heat island can lead to increased air conditioning use which puts a strain on a city energy grid. This increased demand for cooling can amount to a 5-10% increase in peak electricity. One estimate shows that temperature increase from heat island can account for up to 1.5 gigawatts of energy. This increase correlates to increased emissions from municipal power plants. Therefore the heat island effect contributes to problems with air quality including smog formation.
Cool pavements are defined as a class of materials that increase reflectivity of sun light without losing their structural properties. Cool pavements use different types of amendments to keep their surface temperature low. There are many other benefits associated with cool pavements as well, e.g., longer lifetime of pavement, lower initial costs of the asphalt binder, and savings on street lighting and signs, etc. Some examples of cool pavements include: modified asphalt pavements using lightly colored aggregate; resin based pavement; permeable, porous and/or rubberized pavements; chip seals with lightly colored aggregates.
Recently, more exciting approaches to reduce heat island effects and global warming have been identifies, i.e., solar energy harvesting and conversion with potential economic efficiency substantially beyond that of current technology. Thus, there is a need to investigate novel methods to harvest solar energy from road pavements by asphalt technologists.

Strategic Plan

To investigate novel methods to harvest solar energy from roadway pavements, following tasks can be carried out new work group:

  1. Review literatures and existing practices to investigate novel methods to harvest solar energy from asphalt pavement.
  2. Generate different approaches to capture solar energy from asphalt pavements.
  3. Formulate conceptual design of systems to generate electricity.
  4. Prepare the feasibility study report for the detailed and comprehensive study.


Mallick Rajib (V. Chair) Worcester Polytechnic Institute (WPI)
Wang Linbing (Secretary) Virginia Polytechnic Institute and State University
Lee Hosin “David” University of Iowa
Huang Baoshan University of Tennessee
Haddock John E. Purdue University
Dawson Andrew University of Nottingham
Kim Sangsoo Ohio University
Kercher Alan S. KEI President
Harvey John University of California at Davis
Yang Sze URI
Park Kyungwon US Army COE Seoul Branch
Gregory Otto URI Chemical Engineering
Kim Kyungsuk Brown University
Kent Chris Island Solar
Chango Henry D’Ambra Construction Company
Xu Rongqiao Zhejiang University
Wang Fujian Zhejiang University
Lee Kwangho Korea Expressway Corporation
Eum Joo Yon Korea Expressway Corporation
Seo Youngguk Korea Expressway Corporation
Kwon Soo Ahn Korea Institute of Construction Technology
Yi Jaejun Chonbuk National University
Jung Hyung-Jo Korean Adv. Institute of Science and Technology
Suh In-Soo Korean Adv. Institute of Science and Technology
Kim Jae Young Seoul National University
Yeo Myung Suk Seoul National University
Bergado Denes T. Asian Institute of Technology (AIT)
Correia Andy University of Rhode Island
Neilan Brett University of Rhode Island
Hulen Mike Novotech