Evaluation of Longitudinal Joints of HMA Pavements in Tennessee
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2010-05-01
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TRIS Online Accession Number:01469945
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Edition:Final Report 2007-2010
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Abstract:Longitudinal joints between lanes of hot-mix asphalt (HMA) pavements are commonly susceptible to moisture damage and other failures. In 2006, the Tennessee Department of Transportation (TDOT) identified longitudinal joint failure as one of the major distresses for local HMA pavements. It was determined necessary to evaluate available practices and technologies to reduce longitudinal joint failure. This study presents the results from three field projects in Tennessee constructed with seven different longitudinal joint construction techniques. These techniques could be divided into three major categories: joint adhesives (Crafco, Pavon, polymer emulsion and basic emulsion commonly used by TDOT), joint sealers (Jointbond and Replay), and infrared joint heater. Laboratory tests were conducted on the field cores taken from the test sections constructed with different techniques. The laboratory tests included air void content, permeability, indirect tensile (IDT) strength, water absorption, and X-ray CT tests. The results from the laboratory tests show general consistency in characterizing the longitudinal joint construction quality, i.e., the lower the air void content, the lower the permeability, and the higher the IDT strength. Without any special treatment, longitudinal joint exhibited the lowest construction quality, followed by the mat on the cold side. Among the joint adhesives, polymer emulsion appeared to increase the IDT strength of joint. The results from water absorption test indicate that joint sealers may be effective in improving joint performance by preventing water from penetrating into pavement joint. The infrared heater exhibited the best effectiveness in improving joint quality among all the joint construction techniques used in this study.
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