UTC 2022 Funding - Cycle 2 Research Projects

Project No.: CY3-OU-01
Title: Integrating MBA, PIRS, and DSR Testing Process for Rapid Assessment of Emulsified Asphalt Quality in the Field
Performing Institution: University of Oklahoma
Principal Investigator: Kenneth Hobson and Musharraf Zaman, University of Oklahoma; Delmar Salomon (Consultant), Pavement Preservation Systems LLC
Start and Anticipated Completion Dates: 1/1/2026 to 1/15/2027
Abstract: Ensuring emulsified asphalt quality in the field is vital to the success of pavement maintenance and rehabilitation projects and the resulting enhancement of durability and service life. The current test methods for determining emulsified asphalt residue quality are time-consuming and do not address some important properties of residue, like the oxidation level. In the proposed project, the research team from the University of Oklahoma will work collaboratively with a nationally known industry expert to develop a rapid, field-ready testing of emulsified asphalt residue by integrating three different technologies into an innovative quality testing method. The first is a Moisture-Balance Analyzer (MBA), which is an automated laboratory instrument used to measure the moisture content of a sample, will be used for rapid characterization of residue. The second is a Portable Infrared Spectroscopy (PIRS), which is used to identify substances by unique absorption patterns when they interact with infrared light, particularly for assessment of asphalt oxidation. The third is a Dynamic Shear Rheometer (DSR), which is an instrument used to measure the rheological properties of asphalt binders, and to determine its high-temperature performance grade. These three integrated technologies will provide valuable data on emulsified asphalt residue, which is a pay factor for contractors and agencies, affecting payments based on quality standards. Residue not meeting agency specifications and pay deductions impact profitability and cause project delays. Among other factors, the use of MBA ensures fast, automated, and accurate residue testing. The “oxidation fingerprint” serves as an indicator of performance and durability. The integrated MBA-PIRS-DSR test process makes residue results available to contractors much faster than is currently possible, increases agency efficiency and productivity, and reduces project delays.
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