Performance grading of extracted and recovered asphalt cements
| Autor: | Michael Somuah, Pamela Marks, Simon A.M. Hesp, Haibo Ding, Justice Gyasi, Yihua Nie, Imad Ubaid, Nathaniel Tetteh, Seyed Tabib |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
050210 logistics & transportation
05 social sciences Phase angle 0211 other engineering and technologies 02 engineering and technology Building and Construction Asphalt 021105 building & construction 0502 economics and business General Materials Science Geotechnical engineering Grading (education) Civil and Structural Engineering Mathematics |
| Zdroj: | Construction and Building Materials. 187:996-1003 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2018.07.243 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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