BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:EventsCalendar PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York LAST-MODIFIED:20240422T053451Z TZURL:https://www.tzurl.org/zoneinfo-outlook/America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT CATEGORIES:College of Engineering,Thesis/Dissertations DESCRIPTION:Abstract Development of a Balanced 100 Percent Reclaimed Asphal t Pavement Mixture Using Cracking and Rutting Performance Tests by Natalie Youstos The use of reclaimed asphalt pavement (RAP) at high contents can reduce the demand for virgin aggregate and binder, lower construction wast e, and support more sustainable asphalt pavement production. However, 100% RAP mixtures are challenging because the aged RAP binder can improve stif fness and rutting resistance while reducing workability, compactability, a nd cracking resistance. Therefore, 100% RAP mixture design requires a bala nced performance approach that evaluates both cracking and rutting resista nce. This study evaluated 100% RAP asphalt mixtures produced with fraction ated RAP materials from a RAP source in New York. The main objective was t o identify an additive system capable of meeting the New York State Depart ment of Transportation (NYSDOT) balancedmix design criteria. In this thesi s, an additive system refers to a combined modification approach that may include added binder, polymer-modified binder, crumb rubber, asphalt-rubbe r binder, recycled asphalt shingles (RAS) pellets, and/or recycling agents . The evaluated recycling agents were coded as R1 and R2. R1 represents a petroleum-based rejuvenator, while R2 represents a bio-based oil rejuvenat or. Cracking resistance was evaluated using the Indirect Tensile Asphalt C racking Test (IDEAL-CT), with the Cracking Tolerance Index (CTIndex) used as the cracking performance parameter. High-temperature rutting resistance was evaluated using the High-Temperature Indirect Tensile Strength test ( HT-IDT). The selected NYSDOT-based performance criteria were CTIndex ≥ 1 35 and HT-IDT ≥ 30 psi. The results showed a clear cracking–rutting tr adeoff among the evaluated mixtures. Several mixtures satisfied either the cracking criterion or the rutting criterion, but only one mixture satisfi ed both requirements. The most promising mixture contained 1% polymer-iii modified binder (B3), 0.85% R1, 65% RAP sand, and 35% 9/16 in. RAP stone. This mixture achieved an average CTIndex of 189.14 and an average HT-IDT s trength of 31.07 psi. The B3 mixtures showed that increasing R1 dosage imp roved cracking resistance but reduced high-temperature strength, indicatin g the need for careful dosage control. Overall, the balanced mix design fr amework was effective in identifying a candidate 100% RAP mixture that sat isfied the NYSDOT cracking and rutting criteria. Additional validation thr ough aging, moisture susceptibility testing, plant production, and field m onitoring is recommended before implementation. Keywords: 100% RAP, reclai med asphalt pavement, balanced mix design, IDEAL-CT, Cracking Tolerance In dex, HT-IDT, NYSDOT, recycling agent, polymer-modified binder,cracking-rut ting balance.\nEvent page: https://www.umassd.edu/events/cms/7-8-26-cen-ma sters-thesis-presentation-natalie-youstos.php X-ALT-DESC;FMTTYPE=text/html:

Abstract

Development of a Balanced 100 Percent Reclaimed Asphalt Pavement Mixture Using Cracking and Rutting Performance Tests by Natalie Youstos

The use of reclai med asphalt pavement (RAP) at high contents can reduce the demand for virg in aggregate and binder\, lower construction waste\, and support more sust ainable asphalt pavement production. However\, 100% RAP mixtures are chall enging because the aged RAP binder can improve stiffness and rutting resis tance while reducing workability\, compactability\, and cracking resistanc e. Therefore\, 100% RAP mixture design requires a balanced performance app roach that evaluates both cracking and rutting resistance. This study eval uated 100% RAP asphalt mixtures produced with fractionated RAP materials f rom a RAP source in New York. The main objective was to identify an additi ve system capable of meeting the New York State Department of Transportati on (NYSDOT) balanced
mix design criteria. In this thesis\, an additiv e system refers to a combined modification approach that may include added binder\, polymer-modified binder\, crumb rubber\, asphalt-rubber binder\, recycled asphalt shingles (RAS) pellets\, and/or recycling agents. The ev aluated recycling agents were coded as R1 and R2. R1 represents a petroleu m-based rejuvenator\, while R2 represents a bio-based oil rejuvenator. Cra cking resistance was evaluated using the Indirect Tensile Asphalt Cracking Test (IDEAL-CT)\, with the Cracking Tolerance Index (CTIndex) used as the cracking performance parameter. High-temperature rutting resistance was e valuated using the High-Temperature Indirect Tensile Strength test (HT-IDT ). The selected NYSDOT-based performance criteria were CTIndex ≥ 135 and HT-IDT ≥ 30 psi. The results showed a clear cracking–rutting tradeoff among the evaluated mixtures. Several mixtures satisfied either the crack ing criterion or the rutting criterion\, but only one mixture satisfied bo th requirements. The most promising mixture contained 1% polymer-iii modif ied binder (B3)\, 0.85% R1\, 65% RAP sand\, and 35% 9/16 in. RAP stone. Th is mixture achieved an average CTIndex of 189.14 and an average HT-IDT str ength of 31.07 psi. The B3 mixtures showed that increasing R1 dosage impro ved cracking resistance but reduced high-temperature strength\, indicating the need for careful dosage control. Overall\, the balanced mix design fr amework was effective in identifying a candidate 100% RAP mixture that sat isfied the NYSDOT cracking and rutting criteria. Additional validation thr ough aging\, moisture susceptibility testing\, plant production\, and fiel d monitoring is recommended before implementation.

Keywords: 100% RAP\, reclaimed asphalt pavement\, balanced mix design\, IDEAL-CT\, Cracki ng Tolerance Index\, HT-IDT\, NYSDOT\, recycling agent\, polymer-modified binder\,cracking-rutting balance.

Event page: https://www.umassd.edu/events/cms/7-8-26-cen-masters-thesis-present ation-natalie-youstos.php

DTSTAMP:20260624T014514 DTSTART;TZID=America/New_York:20260708T110000 DTEND;TZID=America/New_York:20260708T123000 LOCATION:CIE Conference room SUMMARY;LANGUAGE=en-us:CEN Master's Thesis Presentation Natalie Youstos UID:d43289a4c1146b449db126a1b39a2548@www.umassd.edu END:VEVENT END:VCALENDAR