Publications

Recycled Asphalt Shingle Modified Asphalt Mixture Design and Performance Evaluation

Published: 04/22/2020

By: He Wang, Punyaslok Rath, William G Buttlar

Recycled asphalt shingle modified asphalt mixture design and performance evaluation

Published: 03/24/2020

By: He Wang, Punyaslok Rath, William G Buttlar

Deep machine learning approach to develop a new asphalt pavement condition index

Published: 03/12/2020

By: Hamed Majidifard, Yaw Adu-Gyamfi, William G. Buttlar

Evaluating Thin, Ground-Tire Rubber Asphalt Overlay Alternatives to Traditional Hot-Mix Asphalt Overlays for Lower Traffic Volume Applications

Published: 12/20/2019

By: Buttlar, Bill and Rath, Punyaslok

Investigating Short-term and Long-term Binder Performance of High-RAP Mixtures Containing Waste Cooking Oil

Published: 04/07/2019

By: Hamed Majidifard, Nader Tabatabaee, William G. Buttlar

Performance Analysis of Asphalt Mixtures Modified with Ground Tire Rubber Modifiers and Recycled Materials

Published: 03/25/2019

By: Punyaslok Rath, Joshua E. Love, William G. Buttlar, and Henrique Reis

The usage of Ground Tire Rubber (GTR) in asphalt pavements has gained renewed interest due to its potential sustainability, economic, and performance benefits. This study focuses on asphalt mixtures designed with three different rubber modifier products including (1) a terminal-blend GTR, (2) a dry-process, chemically processed rubber product, and (3) a terminal-blend rubber-polymer hybrid product.

An overview of smartphone technology for citizen-centered, real-time and scalable civil infrastructure monitoring

Published: 10/31/2018

By: Amir H. Alavi , William G. Buttlar

Modern smartphones are equipped with various sensors along with on-board storage, computing and communication capabilities. Owing to these features, they can become an intelligent, scalable, autonomous and potentially cost-free component of the next generation civil infrastructure monitoring systems in future smart cities. Over the past few years, there has been a growing interest in the

Nondestructive Low-Temperature Cracking Characterization of Asphalt Materials

Published: 02/05/2019

By: Behzad Behnia, William G. Buttlar, and Henrique Reis

An acoustic-emission approach to evaluate the low-temperature cracking performance of asphalt binders is presented. The acoustic activity of a thin film of asphalt binder bonded to a granite substrate is monitored while the layer is exposed to decreasing temperatures from around 20°C to approximately −50°C. Results of eight different asphalt binders at three different aging

Performance Characteristics Of Modern Recycled Asphalt Mixes in Missouri, Including Ground Tire Rubber, Recycled Roofing Shingles, and Rejuvenators

Published: 01/10/2019

By: William G. Buttlar, Jim Meister, Behnam Jahangiri, and Hamed Majidifard

A comprehensive lab and field investigation was carried out to evaluate the performance of recycled asphalt mixtures in Missouri by researchers at the University of Missouri-Columbia, in collaboration with the Missouri Department of Transportation and the Midwest Transportation Center. Sixteen field sections were evaluated, including a number of sections from the recent Long-Term Pavement Performance

An efficient mixed-mode rate-dependent cohesive fracture model using sigmoidal functions

Published: 12/11/2017

By: Oliver Giraldo-Londoño, Daniel W. Spring, Glaucio H. Paulino, William G. Buttlar

Rate-dependent fracture processes can be investigated by means of cohesive zone models (CZMs). For instance, one approach enhances existing CZMs with phenomenological expressions used to represent the fracture energy, cohesive strength, and/or maximum crack opening as a function of the crack opening rate. Another approach assumes a viscoelastic CZM in front of the crack tip.