Latex modified asphalt and experimental joint treatments on asphaltic concrete overlays : experimental project No. 3 : asphalt additives.
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1988-06-01
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Abstract:This report documents the construction and initial evaluation of several experimental features which were incorporated as part of an overlay of an existing PCC pavement in order to determine the feasibility of extending overlay service life. The experimental features utilized were several types of waterproofing membranes, sawing and sealing of joints in the asphaltic concrete overlay and the use of a latex-modified asphaltic concrete.
There were several problems noted during the construction of the overlay. When the roller passed over the transverse joints the hot mix mat appeared to shove, such that a noticeable, transversely oriented six-to-eight-inch-wide hump occurred along the joint. Generally, this condition was found in the membrane sections and only occasionally in the other sections. Reflective cracking immediately occurred at many of the transverse joints during the rolling operation, irrespective of section design.
Performance evaluations will be conducted over the next three years and will include joint crack mapping, rutting, ravelling, cracking other than joint cracking, stripping, friction numbers, density and ride quality. Preliminary findings based on initial reflective crack measurements include: sawing and sealing over the existing joints appears to be the most effective treatment to control reflective cracking; latex-modified asphaltic concrete better controls reflective cracking than conventional hot mix; the Bituthene membrane is more effective than the other membranes used; and, there is little difference in performance of the conventional or latex-modified hot mix when the overlay is sawed and sealed over the existing joints.
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