Evaluation of Bond Strength Between Paving Layers For Hot-Mix Asphalt
Record Type: DOT
Many premature pavement failures can be attributed to the loss of bond between two layers of hot mix asphalt (HMA). When the bond fails, slippage occurs and rutting and/or corrugations develop. There is a higher potential for failure at points where traffic is accelerating or decelerating, such as at signals and within horizontal curves. In many construction projects, successive layers of HMA are bonded using a tack coat. Asphalt cements, asphalt emulsions, and cutback asphalts have all been used as tack coats. In many cases, improved tack coats would eliminate or significantly reduce the potential for premature pavement failure due to loss of bond between HMA layers. It is well understood that the type of asphalt, grade of asphalt, and amount of tack coat affects the bond between layers. However, there is presently no standard method to evaluate the effect of these variables, and hence the potential of the variables to improve the bond between two HMA layers. This research seeks to develop a simple, quick, and relatively inexpensive test method to evaluate the bond strength between HMA layers. If poor interlayer bond can be detected prior to opening a pavement to traffic, steps can be taken to correct the problem. The result will be potentially significant savings in construction, maintenance, and rehabilitation costs.
Start date: 2006/7/1
Status: Active
Contract/Grant Number: TRC-0706
Total Dollars: 223833
Source Organization: Arkansas State Highway and Transportation Department
Date Added: 04/25/2007
Index Terms: Hot mix paving mixtures, Hot mixed asphalt, Pavement cracking, Pavement distress, Pavement layers, Pavement performance, Paving, Rutting, Tack coats, Construction and maintenance, Rehabilitation (Maintenance), Research projects,
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Arkansas State University, State University
Department of Engineering, P.O. Drawer 1740
State University, AR 72467-1740
USA
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Hall, Kevin D.
Phone: (501) 575-8695
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