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Use of J-Band to Improve the Performance of the HMA Longitudinal Joint

Status:  Complete
Report Date:  12/23/2020

Summary:

Researchers found that using J-Band, a void-reducing asphalt membrane (VRAM) sprayed in a band along longitudinal joints of pavement before asphalt layers are applied, improves air void and permeability levels, strengthens bonds between layers, improves asphalt macrostructure and fracture resistance, and should result in better crack resistance and longer service life in the field. Investigators compared a mile section of asphalt on State Highway 22 to a mile of non-VRAM asphalt pavement at the same site. Tests of asphalt cores with J-Band indicated that VRAM binder material migrates upward into the top asphalt layer. Cores produced higher bond strength, lower permeability and air void levels, and improved crack resistance. The material offers, at a minimum, an annual savings of over $900 per two-lane mile and $4,700 per four-lane mile.

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