Performance grading of extracted and recovered asphalt cements. (30th October 2018)

• Record Type: Journal Article
• Authors: Ding, Haibo; Gyasi, Justice; Hesp, Simon A.M.; Marks, Pamela; Nie, Yihua; Somuah, Michael; Tabib, Seyed; Tetteh, Nathaniel; Ubaid, Imad
• Is Part Of: Construction & building materials. Volume 187(2018)
• Page Start: 996
• Page End: 1003
• Publication Date: 2018-10-30
• Subjects: AASHTO American Association of State and Highway Transportation Officials -- AC asphalt cement -- ASTM American Society for Testing and Materials -- ATSDR Agency for Toxic Substances and Disease Registry -- BBR bending beam rheometer -- CTOD critical crack tip opening displacement -- DCM dichloromethylene -- DENT double-edge-notched tension -- EBBR extended bending beam rheometer -- EPA Environmental Protection Agency -- ESEM environmental scanning electron microscope -- FHWA United States Federal Highway Administration -- II intermediate temperature AASHTO M320 grade -- LS laboratory standard -- MTO Ministry of Transportation of Ontario -- PAV pressure aging vessel -- PG performance grade -- QA quality assurance -- RAP reclaimed asphalt pavement -- RAS recycled asphalt shingles -- REOB recycled engine oil bottoms -- RTFO rolling thin film oven -- TCE trichloroethylene -- TP test protocol -- XX high temperature AASHTO M320 grade -- YY low temperature AASHTO M320 grade; Asphalt cement specification grading -- Cold temperature cracking -- Asphalt cement extraction -- Asphalt cement recovery -- Double-edge-notched tension test -- Extended bending beam rheometer test; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.07.243
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Current pavement designs based on regular BBR grades fail to provide control of cold temperature cracking. It is imperative to test extracted and recovered asphalt cement for specification grading. Extended BBR grades for 3–5 year old pavements showed deficits ranging from 3 °C to 17.3 °C. Extended BBR grades correlate well with limiting phase angle temperatures. Abstract: Binder extracted and recovered from pavement core samples at two different locations from 18 contracts showed small differences within contracts, well within the minor borderline acceptance criteria. Serious discrepancies were found between original tank sampled asphalt binder and material recovered from pavement cores. Regular BBR grades for recovered materials were on average 2.7 °C in deficit, which is considered high for 3–5 years of service. EBBR grades were on average 7.6 °C in deficit (range 3 °C to 17.3 °C). Equilibrium grades, after 72 h of conditioning, correlated well with temperatures where the phase angle reached 30° after minimal conditioning, suggesting that a limit on phase angle may provide a practical quality assurance measure.