Comparison of the use of notched wedge joints vs. traditional butt joints in Connecticut
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2008-11-07
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Abstract:Performance of Hot Mix Asphalt (HMA) longitudinal joints have been an item of increasing scrutiny in
Connecticut. The traditional butt joint has typically been the method used in Connecticut. These joints
have been reportedly opening up, creating a longitudinal crack at the joint, and thus, contributing
significantly to the premature failure of the wearing surface. It has been widely speculated that alternative
longitudinal joint construction methods could be employed to reduce the rate at which joints fail. This
project investigated the Notched Wedge Joint, as well as the traditionally used butt joint for comparison
purposes. Two resurfacing projects were constructed in Connecticut during the 2006 paving season, and
one in 2007, that utilized the notched wedge joint construction method. Nuclear density and volumetric
density from cut cores along the longitudinal joints from these projects were investigated. Also
investigated during the 2006 and 2007 construction season were resurfacing projects which utilized the
traditional butt joint.
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