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Abstract for presentation (Poster or Podium) with a Paper in the Conference Proceedings

Highway Pavements

Creep Compliance and Dynamic Modulus Interconversion for Pavement ME Implementation in North Dakota

Monday, June 17, 2024

10:15 AM - 11:30 AM ET

Room: Galleria

Primary Author(s)

DO

Duncan Oteki, PhD Student

Ph.D. Student
University of North Dakota, United States

Co-Author(s)

AY

Andebet Yeneneh, Msc.

Civil Engineer
Hayat Brown
Washington, District of Columbia, United States
Daba S. Gedafa, Ph.D., P.E., ENV SP, F. ASCE

Chair and Professor
University of North Dakota
GRAND FORKS, North Dakota, United States

Presenter(s)

Daba S. Gedafa, Ph.D., P.E., ENV SP, F. ASCE

Chair and Professor
University of North Dakota
GRAND FORKS, North Dakota, United States

Co-Author(s)

Nabil Suleiman, Ph.D.

Associate Professor
University of North Dakota
Grand Forks, North Dakota, United States

Submitter(s)

DO

Duncan Oteki, PhD Student

Ph.D. Student
University of North Dakota, United States

Abstract:

Thermal cracking is an important pavement distress in cold regions such as North Dakota. Pavement Mechanic-Empirical (ME) uses creep compliance [D(t)] to predict the long-term thermal cracking performance of asphalt mixtures. Measuring D(t) in the laboratory is costly, time-intensive, and requires expertise. This study used the interconversion procedure to generate D(t) inputs from the measured and predicted dynamic modulus (|E*|) values of ten typical North Dakota hot mix asphalt (HMA) mixtures. The asphalt mixtures had varying binder performance grades and recycled asphalt pavement (RAP) content. The two sets of D(t) inputs were used to compare thermal cracking performance for levels 1 and 3 of the Pavement ME. The results revealed that the two mixtures without RAP, HWY 28 and HWY 52, exhibited higher D(t) values, indicating their ability to dissipate thermal stresses compared to the other mixtures containing RAP. Mixtures containing stiffer binders exhibited lower D(t), indicating susceptibility to thermal cracking. Pavement ME simulations showed that thermal cracking predictions were overpredicted when using level 3 input data compared to level 1 input data, meaning that level 3 would produce conservative pavement designs. Using interconverted D(t) from laboratory-measured and predicted |E*| values can be used instead of lab-measured D(t) in support of the implementation of Pavement ME in North Dakota.

Learning Objectives:

Attendees can expect to learn the following from this session:

Conduct numerical interconversion to obtain asphalt mixtures' creep compliance [D(t)] from measured and predicted dynamic Moduli (E*) in favor of measuring creep compliance.
Describe the effect of varying RAP content and binder grades on the creep compliance and thermal cracking performance of asphalt mixtures used in cold regions.
Describe the suitability of using interconverted creep compliance from lab-measured and predicted |E*| on long-term thermal cracking performance of asphalt mixtures in accordance with the mechanistic-empirical pavement design guidelines (MEPDG).