Abstract
Due to the limitation of traffic condition and paving equipment, longitudinal joint is an unavoidable and common problem in hot mix asphalt (HMA) pavement construction. These longitudinal joints between lanes of HMA pavements are generally susceptible to moisture and other failures and have been one of the major problems for HMA pavements. Joint heater is one of the common techniques to improve the quality of longitudinal joint construction. This paper presents the results of a laboratory study of evaluating effects of joint heater on longitudinal joints. A test field project was conducted to evaluate the effect of joint heater on longitudinal joints and specimen cores along the longitudinal joints were taken in both conventional section and heat-treated section. Air voids, permeability tests and indirect tensile test were conducted on those field specimens. The test results showed that, with proper temperature control, the joint heater can significantly improve the behavior of pavement around longitudinal joints and is a very useful technique in improving longitudinal construction quality.
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