United States Department of Transportation
i
Extending the Service Life of Rigid Pavement Joints With Self-Healing Sealants
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2023-12-31
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[PDF-3.72 MB]
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Edition:Final Report, 02/01/2020 – 12/31/2023
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Abstract:As transportation agencies largely neglect joint sealant maintenance in concrete pavements, water infiltration into the deteriorated joint and subgrade often results in base softening, erosion, and faulting, posing a significant financial burden on taxpayers. To improve the durability performance of concrete pavement sealants, an elastomer with self-healing ability was designed by incorporating dynamic disulfide bonds. The effects of monomer type, type of initiator/catalyst and its concentrations on the polymer network were analyzed to understand how they influence material properties and eventually polymer self-healing. The performance of the new self-healing sealant was characterized under typical environmental and load conditions experienced by pavement joints. The sealant exhibited satisfactory performance across several aspects (modulus, strength, adhesion, hardness, fatigue) with self-healing efficiency of 78%. However, before implementation, critical concerns regarding residual deformation and resistance must be addressed.
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