A STUDY OF LONGITUDINAL JOINT CONSTRUCTION TECHNIQUES IN HMA PAVEMENTS (INTERIM REPORT - COLORADO PROJECT)
There is a need to identify suitable longitudinal joint construction techniques for multilane hot mix asphalt (HMA) pavements, which can minimize or eliminate cracking at the joint and/or ravelling adjacent to the joint. It is believed that the longitudinal cracks primarily result from the density gradient which is usually encountered across the joint. This density gradient can be attributed to the low density at the unconfined edge when the first lane is paved, and a relatively high density at the confined edge when the adjacent lane is paved. Seven different longitudinal joint construction techniques were used on Interstate 25 in Colorado in 1994. The techniques included different rolling procedures to compact the joint, providing a vertical face with a cutting wheel, and using a rubberized asphalt tack coat on the face of the unconfined edge. Two longitudinal joint construction techniques were used on Interstate 79 in Pennsylvania in 1994. These consisted of the conventional technique (control) and New Jersey type wedge joint. The latter technique uses a 3:1 taper at the unconfined edge of the first lane. The face of the taper is heated with an infrared heater just prior to placing the adjacent lane. Pavement cores were taken on the joint and 305 mm (1 foot) away from the joint for density measurements in all experimental test sections. Different joint construction techniques have been ranked based on statistical analysis of all density data. Various joints were also evaluated visually by a team of at least four engineers in June 1995. The performance or ranking of the joints on both Colorado and Pennsylvania projects after one winter seems to have been influenced by the overall density of the joint. The joints with high densities show better performance than those with relatively low densities. These rankings may change in the future based on the long term performance (in terms of cracking and ravelling).
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- This paper was presented at the 75th Annual Meeting of the Transportation Research Board held in Washington, DC (January 7-11, 1996).
National Center for Asphalt TechnologyAuburn University, 277 Technology Parkway
Auburn, AL United States 36830
- Kandahl, P S
- Mallick, R B
- Publication Date: 1996-2
- Features: Figures; References; Tables;
- Pagination: 27 p.
- TRT Terms: Asphalt pavements; Construction management; Density; Hot mix asphalt; Joint construction; Longitudinal cracking; Longitudinal joints; Multilane highways; Pavement performance
- Subject Areas: Construction; Highways; Materials; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;
- Accession Number: 00724582
- Record Type: Publication
- Report/Paper Numbers: NCAT 96-3
- Files: NTL, TRIS
- Created Date: Aug 15 2001 12:00AM