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Project Details
STATUS

Completed

START DATE

10/01/09

END DATE

07/31/13

RESEARCH CENTERS InTrans, CTRE
SPONSORS

California Department of Transportation
Colorado Department of Transportation
Federal Highway Administration Transportation Pooled Fund
Illinois Department of Transportation
Indiana Department of Transportation
Iowa Department of Transportation
Minnesota Department of Transportation
Missouri Department of Transportation
Wisconsin Department of Transportation

Researchers
Principal Investigator
Chris Williams

Director, AMPP

Student Researcher(s)
Andrew Cascione
Jianhua Yu

About the research

State highway agencies are increasingly intersted in using recycled asphalt shingles (RAS) in hot mix asphalt (HMA) applications, yet many agencies share common questions about the effect of RAS on the performance of HMA. Previous research has allowed for only limited laboratory testing and field surveys. The complexity of RAS materials and lack of past experiences led to the creation of Transportation Pooled Fund (TPF) Program TPF-5(213). The primary goal of this study is to address research needs of state DOT and environmental officials to determine the best practices for the use of recycled asphalt shingles in hot-mix asphalt applications.Agencies participating in the study include Missouri (lead state), California, Colorado, Illinois, Indiana, Iowa, Minnesota, Wisconsin, and the Federal Highway Administration. The agencies conducted demonstration projects that focused on evaluating different aspects (factors) of RAS that include RAS grind size, RAS percentage, RAS source (post-consumer versus post-manufactured), RAS in combination with warm mix asphalt technology, RAS as a fiber replacement for stone matrix asphalt, and RAS in combination with ground tire rubber. Field mixes from each demonstration project were sampled for conducting the following tests: dynamic modulus, flow number, four-point beam fatigue, semi-circular bending, and binder extraction and recovery with subsequent binder characterization. Pavement condition surveys were then conducted for each project after completion.

The demonstration projects showed that pavements using RAS alone or in combination with other cost saving technologies (e.g., WMA, RAP, GTR, SMA) can be successfully produced and meet state agency quality assurance requirements. The RAS mixes have very promising prospects since laboratory test results indicate good rutting and fatigue cracking resistance with low temperature cracking resistance similar to the mixes without RAS. The pavement condition of the mixes in the field after two years corroborated the laboratory test results. No signs of rutting, wheel path fatigue cracking, or thermal cracking were exhibited in the pavements. However, transverse reflective cracking from the underlying jointed concrete pavement was measured in the Missouri, Colorado, Iowa, Indiana, and Minnesota projects.

Project Details
STATUS

Completed

START DATE

02/01/03

END DATE

12/01/07

RESEARCH CENTERS InTrans, CP Tech Center, CTRE
SPONSORS

American Concrete Pavement Association
Concrete paving industry
Federal Highway Administration
Georgia Department of Transportation
Indiana Department of Transportation
Iowa Department of Transportation
Kansas Department of Transportation
Lousiana Department of Transportation
Michigan Department of Transportation
Minnesota Department of Transportation
Nebraska Department of Roads
New York State Department of Transportation
North Carolina Department of Transportation
North Dakota Department of Transportation
Ohio Department of Transportation
Oklahoma Department of Transportation
South Dakota Department of Transportation
Texas Department of Transportation
Wisconsin Department of Transportation

Researchers
Principal Investigator
Jim Grove

PCC Engineer

Co-Principal Investigator
Tom Cackler
Student Researcher(s)
Fatih Bektas

About the research

The objectives of this five-year Transportation Pooled Fund study are to evaluate conventional and new technologies and procedures for testing concrete and concrete materials to prevent material and construction problems that could lead to premature concrete pavement distress, and to develop a suite of tests that provides a comprehensive method of ensuring long-term pavement performance. A preliminary suite of tests to ensure long-term pavement performance has been developed. Shadow construction projects are being conducted to evaluate the preliminary suite of tests. A mobile concrete testing laboratory has been designed and equipped to facilitate the shadow projects. The results of the project are being compiled in a user-friendly field manual, which will be available by summer 2006.

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