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Pavements 2025

Innovative Sustainable Methods, Materials, and Recycling

Pavements: Sustainable Infrastructure Solutions for Changing Climate

Sustainable Chip Seals for Climate-Resilient, Reflective Pavements in Urban Heat Mitigation

Wednesday, June 11, 2025

9:15 AM – 9:30 AM MT

Primary Author(s)

Khalidabegaum H. Muntasher, PhD

Ph.D. Student
The University of Oklahoma
NORMAN, OK, United States

Presenter(s)

Khalidabegaum H. Muntasher, PhD

Ph.D. Student
The University of Oklahoma
NORMAN, OK, United States

Co-Author(s)

SA

Syed A. Ali, syed.a.ali@ou.edu

Research Assistant Professor
University of Oklahoma
Norman, Oklahoma, United States
ARIF SADRI, n/a

Associate Professor
University of Oklahoma
Norman, Oklahoma, United States
Kenneth R. R. Hobson, n/a

Asphalt Laboratory Manager
University of Oklahoma
Norman, Oklahoma, United States
Musharraf Zaman, Ph.D.

Professor
University of Oklahoma
Norman, Oklahoma, United States

Submitter(s)

Khalidabegaum H. Muntasher, PhD

Ph.D. Student
The University of Oklahoma
NORMAN, OK, United States

Abstract: The increasing need for sustainable infrastructure and climate adaptation has sparked interest in materials that can lower surface temperatures, improve safety, and ensure long-term pavement performance. With that as the main background, this study was focused on developing and assessing the performance of innovative, climate-resilient chip seals for reflective pavements. Specifically, this study evaluated the use of two emulsions: Polymer-Modified Cationic Rapid-Set (PMCRS-1s) asphalt emulsions and a special product called clear asphalt emulsion, along with locally sourced cover aggregates as chip seal materials. The shape and texture-related index properties were assessed using AIMS, and the durability and reflectivity of the cover aggregates were tested in the laboratory at a large public university in the United States. The study also examined the compatibility of the aggregate-binder using compatibility ratio. The McLeod method was adopted for the chip seal design and compared with the Oklahoma Department of Transportation (ODOT) specifications. The surface reflectivity of the materials was measured using the Solar Reflective Index (SRI). The results showed that chip seals incorporating clear asphalt with cover aggregates significantly improved reflectivity, achieving high SRI values. Therefore, it is expected that clear asphalt and local aggregates will help reduce surface temperatures and alleviate urban heat island effects.

Learning Objectives:

Attendees can expect to learn the following from this session:

Compare studies with clear asphalt and conventional asphalt emulsions
Design chip seals using Mcleod method
Conduct laboratory studies on chip seals