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AuthorMaina, James
AuthorKhnaizer, Jean
Available date2020-04-30T12:59:31Z
Publication Date2020
Publication NameProceedings of the International Conference on Civil Infrastructure and Construction
CitationMaina J., Khnaizer J., Producing High Quality Recycled Hot Asphalt with Increased Reclaimed Asphalt Content – Qatar Experience, International Conference on Civil Infrastructure and Construction (CIC 2020), Doha, Qatar, 2-5 February 2020, DOI: https://doi.org/10.29117/cic.2020.0044
ISSN2958-3128
IdentifierP. O. Box: 2713 Doha-Qatar, Email: qupress@qu.edu.qa
URIwww.cic.qa
URIhttp://dx.doi.org/10.29117/cic.2020.0044
URIhttp://hdl.handle.net/10576/14730
AbstractUnder the Public Works Authority (PWA) maintenance framework contract in the State of Qatar, road rehabilitation and maintenance generate considerable amounts of Reclaimed Asphalt (RA) than can be used in recycled Hot Mix Asphalt (HMA). Therefore, there is a great necessity to develop a national experience to understand the constraints and limitations of increasing RA content in recycled HMA while aligning this with the PWA initiatives on using and increasing RA in HMA. This paper sets out a guideline on how to increase RA content in HMA, considering the RA and virgin material characteristics, setup and capabilities of the asphalt plant. The study aimed to produce several recycled HMA mixes with increased RA contents using a dense-graded 19.0 mm Nominal Maximum Aggregate Size (NMAS) PEN 60/70 mix. Instead of performing design for each RA content, adjustments on the blending proportions were made accordingly as such to meet the same Job Mix Formula (JMF) of an approved HMA mix. Characterizing the RA besides data of the virgin material properties helped in adjusting the proportion during the HMA production as such to meet the control JMF. Qatar Construction Specification (QCS) 2014 was used to benchmark the results of various HMA mixtures that were prepared according to the Marshall mix design method. This paper draws a practical guideline and best practices on how to produce and optimize RA content in recycled HMA, in addition to highlighting and improving key parameters surrounding the production, from milling to laying, to produce stable, workable yet performing mixes.
Languageen
PublisherQatar Univesrity Press
SubjectReclaimed asphalt
Recycled asphalt mix
Job mix formula
Marshall properties
TitleProducing High Quality Recycled Hot Asphalt with Increased Reclaimed Asphalt Content – Qatar Experience
TypeConference Paper
Pagination349-355
ESSN2958-3136
dc.accessType Open Access


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