United States Department of Transportation
i
A Study of Longitudinal Joint Construction Techniques in HMA Pavements (Interim Report - Colorado Project)
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1996-02-01
[PDF-221.11 KB]
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Abstract:There is a need to identify suitable longitudinal joint construction techniques for multilane hot mix asphalt (HMA) pavements, which can minimize or eliminate cracking at the joint and/or ravelling adjacent to the joint. It is believed that the longitudinal cracks primarily result from the density gradient which is usually encountered across the joint. This density gradient can be attributed to the low density at the unconfined edge when the first lane is paved, and a relatively high density at the confined edge when the adjacent lane is paved. Seven different longitudinal joint construction techniques were used on Interstate 25 in Colorado in 1994. The techniques included different rolling procedures to compact the joint, providing a vertical face with a cutting wheel, and using a rubberized asphalt tack coat on the face of the unconfined edge. Two longitudinal joint construction techniques were used on Interstate 79 in Pennsylvania in 1994. These consisted of the conventional technique (control) and New Jersey type wedge joint. (30 p.)
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