Evaluation of Longitudinal Joints of HMA Pavements in Tennessee
Record Type: UTC
Longitudinal joints between lanes of hot-mix asphalt (HMA) pavements are commonly susceptible to moisture and other failures. Like many other states, HMA paving in Tennessee almost exclusively adopts the practice of paving one lane at a time. Hence there is commonly the problem of compacting hot-mix asphalt adjacent to existing cold HMA lane(s). Several factors have been identified to be the causes of HMA joint failures. First, it is difficult to achieve the desired pavement densities near the longitudinal joints with normal compaction techniques. Lower densities mean higher air voids and lower pavement strength, which will likely introduce moistures into the open voids and cause pavement failures. Secondly, interface bond between existing cold HMA pavement lane(s) and newly constructed lane(s) can never achieve the strength of HMA inherent strength (cohesion) without joint treatments. In addition, the orientations of longitudinal joints are usually in-line with wheel loads, which result in maximum shear stress on the weakly bonded interface. Over the years, longitudinal joint failure has been one of the major distresses for pavements in Tennessee. It is necessary to evaluate the available practices and technologies and find the best solutions that will mitigate and/or eliminate longitudinal failures for HMA pavements in Tennessee.
Start date: 2007/7/1
End date: 2008/7/31
Status: Active
Contract/Grant Number: RO1-1313-3077
Secondary Number: P5
Total Dollars: 25000
Source Organization: University of Tennessee, Knoxville (STC)
Date Added: 02/28/2008
Index Terms: Hot mix paving mixtures, Longitudinal cracking, Longitudinal joints, Moisture content, Tennessee, Pavement distress, Cohesion, Research projects,
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