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X-WR-CALNAME:CECON 2026
X-WR-CALDESC:Revitalizing Resiliency
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UID:MEC-bd3ef5c19067fe179f71c8b86ea4b39b@texascecon.org
DTSTART;TZID=America/Chicago:20260918T103000
DTEND;TZID=America/Chicago:20260918T113000
DTSTAMP:20260713T162014Z
CREATED:20260713
LAST-MODIFIED:20260805
PRIORITY:5
SEQUENCE:1
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SUMMARY:Recyclability Evaluation of Asphalt Millings with Geosynthetic Interlayer Remnants for Pavement Base Course Applications
DESCRIPTION:The incorporation of geosynthetic interlayers, such as geotextiles and geogrids, in asphalt layers has been shown to delay crack propagation and increase the fatigue life of asphalt overlays. Consequently, the growing use of geosynthetic interlayers in asphalt layers is expected to generate increasing quantities of reclaimed asphalt pavement (RAP) containing geosynthetic interlayer remnants (referred to as GRAP) when these pavements are milled, raising concerns about the millability of asphalt layers containing geosynthetic interlayers and the recyclability of the resulting GRAP. In this study, three distinct project sites were chosen, where milling operations were conducted on asphalt layers incorporating a nonwoven geotextile (GT), a polyester (PET) geogrid and a fiberglass (FG) geogrid, as well as on asphalt layers without geosynthetic interlayers, to investigate whether asphalt layers incorporating geosynthetic interlayers affected milling efficiency or equipment operation. After milling, the resulting asphalt millings with and without geosynthetic interlayer remnants were collected from all three sites and transported to the laboratory for characterization. Subsequently, the recyclability of GRAP and RAP samples for use in pavement base course applications was evaluated by performing the compaction, abrasion, fragmentation, hydraulic conductivity, resilient modulus and permanent deformation tests. Accordingly, RAP and GRAP samples were blended with virgin aggregate (VA) at two different percentages (25% and 50%) based on the total weight of base course blends. Observations of milling operations conducted at all three project sites showed that asphalt layers containing geosynthetic interlayers were milled without operational interruptions or visually observed equipment damage. Additionally, the base course blends containing GRAP exhibited similar or improved physical and mechanical properties compared to those containing RAP. These findings suggest that base course layers can incorporate up to 50% GRAP, potentially reducing VA demand and ultimately leading to sustainable construction practices.\n
URL:https://texascecon.org/cecon/recyclability-evaluation-of-asphalt-millings-with-geosynthetic-interlayer-remnants-for-pavement-base-course-applications/
CATEGORIES:Sessions,Transportation & Development Institute (TxTDI)
LOCATION:C102
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