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Warm Mix Asphalt SCAN. May – June 2007 Norway-Germany-Belgium-France. Our Visit. Background Warm Mix Technologies European Experience SCAN Findings Implementation Direction. Purpose of a SCAN Tour.

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warm mix asphalt scan

Warm Mix AsphaltSCAN

May – June 2007

Norway-Germany-Belgium-France

WMA SCAN 2007

our visit
Our Visit

Background

Warm Mix Technologies

European Experience

SCAN Findings

Implementation Direction

WMA SCAN 2007

purpose of a scan tour
Purpose of a SCAN Tour

Identifies and evaluates foreign technologies and practices that could significantly benefit US transportation systems

Main channel for accessing innovation is the International Scanning Program

Joint program with FHWA, AASHTO, and NCHRP

WMA SCAN 2007

what is wma
What is WMA?
  • Allows reduction of temperatures at which asphalt mixes are produced and placed
    • Reduces viscosity at lower temps
    • Allows the complete coating of aggregate
    • Reduces Emissions

WMA SCAN 2007

4

classification of wma by temperature range
Classification of WMA by Temperature Range

Heating

Latent Heat of Vaporization

Vaporization

Drying

WMA SCAN 2007

purpose of scan
Purpose of SCAN

To investigate and implement innovative technologies and policies related to WMA. Topics of interest included:

  • WMA processes
  • Mix design & construction practices
  • WMA performance
  • Limitations
  • Benefits

WMA SCAN 2007

scan team
SCAN Team

4 DOT’s

Maine

North Carolina

Nebraska

Illinois

3 FHWA

2 Industry Associations

2 Contractors

1 Chemist

1 Consultant

WMA SCAN 2007

who did we visit
Who Did We Visit?

Oslo, Norway

Köln, Germany

Brussels, Belgium

Paris, France

Frankfurt, Germany

Nantes, France

WMA SCAN 2007

factors driving development of wma
Factors Driving Development of WMA
  • The environment and sustainable development concerns, “Green Construction”
    • Reduction in energy consumption
    • Reduction in CO2 emissions
  • Extension of paving season and longer haul distances
  • Improvement in field compaction
  • Welfare of workers

WMA SCAN 2007

european experience the for implementation
European ExperienceThe for Implementation

Norway

Contractor/Supplier Driven

Germany

Contractor Driven

Fumes

France

Contractor Driven/Agency Supported

Sustainable Technologies

Netherlands

Contractor Driven

WMA SCAN 2007

european mix design practices
European Mix Design Practices

Mix design practices varied from country to country

Some gyratory, some Marshall

Some empirical, some fundamental

All used performance tests!

wma technologies
WMA Technologies
  • Organic Additives
  • Foaming Systems with Stabilizers
  • Emulsion Systems
  • Others…

WMA SCAN 2007

13

placement and compaction
Placement and Compaction

“Business as usual”

Primarily use:

Heavy, tamping bar, vibratory screed pavers

Steel-wheel vibratory and static rollers

Workability generally good

WMA SCAN 2007

performance of wma
Performance of WMA
  • Consensus of European Countries that WMA should provide equal or better performance than HMA
    • Norway – performance mixed
    • Germany – performance same or better
    • France – toll road operator, district, and city of Paris pleased with performance to date

WMA SCAN 2007

benefits of wma
Benefits of WMA
  • Reduced Emissions
  • Reduced Fuel Usage
  • Paving Benefits
    • Pave in cool weather
    • Haul mix longer distances
    • Improved compaction
    • Facilitate deep patches
    • Ability to use more RAP
  • Reduced Worker Exposure

WMA SCAN 2007

reduced emissions
Reduced Emissions

CO2 SO2 VOC CO NOx Dust

scan challenges

SCAN Challenges

WMA SCAN 2007

slide19
Adapt technologies from low production European batch/drum plants to higher production plants used in the US
coarse aggregate must be dry
Coarse Aggregate must be DRY

Aggregates used in Europe have relatively low water absorptions, < 2%

Aggregates routinely used in the US have higher water absorptions

Best Practices should be used to minimize the moisture content in aggregate

initial product approval how do we sort out the good products from the bad
Initial product approval; how do we sort out the good products from the bad?

WMA SCAN 2007

products should be approved on a national or at least a regional basis
Products should be approved on a national or at least a regional basis

German agencies, industry, and academia have jointly developed a “Merkblatt” or guidelines for the use of WMA

In France, SETRA performs certifications of new products. Cooperatively supported between agency and industry

WMA SCAN 2007

22

slide23
Individual Contractors are going to have to determine which WMA process will work over the widest range of applications.

WMA SCAN 2007

implementation goals
Implementation Goals
  • WMA should be an acceptable alternative to HMA at the Contractor’s discretion, provided the WMA meets applicable HMA specifications.

WMA SCAN 2007

implementation goals25
Implementation Goals
  • An approval system needs to be developed for new WMA technologies based on performance testing and supplemented by field trials.
    • WMA TWG should lead the development of a performance based evaluation plan for new WMA products.

WMA SCAN 2007

implementation goals26
Implementation Goals
  • Encourage more field trials with:
    • Higher traffic
    • Larger size with representative production of WMA
    • Built in conjunction with a control section
    • Monitored for a minimum of three years by the agency
    • Data collection guidelines, developed by the WMA TWG can be found at:

http://www.hotmix.org/view_article.php?ID=537

  • The factors affecting the economic viability of WMA need to be identified and tracked.

WMA SCAN 2007

conclusions
Conclusions

There is a consensus among the WMA SCAN Team that WMA is a viable technology and that US Agencies and the HMA Industry need to cooperatively pursue this path

The US has already made great strides in evaluating WMA, thanks in part to Public-Private Partnerships like the WMA TWG and the WMA SCAN Tour

WMA SCAN 2007

thank you

Thank You!

Questions/Discussion?

WMA SCAN 2007