By: William Buttlar, Behnam Jahangiri, Punyaslok Rath, Hamed Majidifard, Loreto Urra, James Meister, Henry BrownRead More
In the past, traditional asphalt mixtures involved relatively simple combinations of virgin asphalt binder and aggregates to meet performance requirements. However, modern, heterogeneous asphalt mixtures exhibit more complex behavior due to a proliferation of new ingredients and because of the interactions that subsequently occur. As a result, recent asphalt mixes require advanced performance tests to
By: William G. Buttlar and Punyaslok RathRead More
Every year almost 300 million scrap tires are generated in the United States. Recycled rubber obtained from scrap tires can be used in a number of beneficial ways. One of the most beneficial uses involves producing Ground Tire Rubber (GTR) from scrap tires and using the GTR to create Rubber-Modified Asphalt (RMA). RMA has been
By: Behnam Jahangiri, Punyaslok Rath, Hamed Majidifard, Loreto Urra, William G. ButtlarRead More
This study investigates the lab and field performance of four asphalt mixtures placed in Missouri, USA, containing reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS). Laboratory tests including disk-shaped compact tension fracture (DC(T)), indirect tension (IDT) creep and strength, Illinois flexibility index (I-FIT), indirect tensile cracking test (IDEAL-CT), and the Hamburg wheel tracking test (HWTT)
By: Hamed Majidifard, Behnam Jahangiri, Punyaslok Rath, Amir H. Alavi, William G. ButtlarRead More
The Hamburg wheel tracking test (HWTT) is a widely used testing procedure designed to accelerate and simulate the rutting phenomena in the laboratory. Rut depth, as one of the outputs of the HWTT, is dependent on a number of parameters related to mix design and testing conditions. This study introduces a new model for predicting
By: Punyaslok Rath, Joshua E. Love, William G. Buttlar, and Henrique ReisRead More
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.
By: Amir H. Alavi , William G. ButtlarRead More
Highlights A comprehensive literature review of smartphone-centric research for civil infrastructure monitoring. Emphasis placed on sensing capabilities of smartphones and their crowdsourcing power. A case study to prove smartphones as cost-effective tools for real-time data collection. Discussing the limitations, challenges and future directions for widespread application of smartphone-driven monitoring systems.