“Self-Healing Asphalt” on I-40 Deemed a Success in Oklahoma

Equipment World

By Don McLoud April 10, 2023

The Oklahoma Department of Transportation reports success from using an asphalt mixture that prevents cracking, what some call “self-healing” asphalt.

ODOT used a crack attenuating mixture (CAM) on a repaving project in 2012 on I-40 in Caddo County. Eleven years later, the 2-mile section has an International Roughness Index that averages 50 inches per mile, “which is smooth enough to result in ride quality bonuses for new construction in some states,” according to the Federal Highway Administration. A good IRI is considered to be less than 95 inches per mile.

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