Binder oxidative aging in Texas pavements: Hardening rates, hardening susceptibilities, and impact of pavement depth

Nasser A. Al-Azri*, Sung Hoon Jung, Kevin M. Lunsford, Ann Ferry, Jerry A. Bullin, Richard R. Davison, Charles J. Glover

*المؤلف المقابل لهذا العمل

نتاج البحث

46 اقتباسات (Scopus)

ملخص

Aging of binders in pavements is much less understood than laboratory aging of neat binders because of a number of complications. Complications include suitable extraction and recovery methods; uncontrolled variables and unknowns such as mixture characteristics (e.g., air voids), maintenance treatments, traffic, and climate; sustaining of a research effort to study a given pavement during an appropriate time frame (in excess of one decade); and cost. An ongoing research effort sponsored by the Texas Department of Transportation studied binder oxidative hardening at 15 pavements across Texas. Results indicate that typically unmodified binders in pavements oxidize and harden to a degree that exceeds generally accepted pavement aging assumptions. In addition, this hardening may extend much deeper into the pavement than has been previously assumed or documented. Data suggest that pavements can oxidize at surprisingly uniform rates with depth once early oxidation occurs and that these rates continue for an extended time. As a rough measure, 1 month environmental room aging of 1-mm neat binder films at 60°C was equivalent to about 15 months in Texas Highway 21 after the early higher hardening rate period.

اللغة الأصليةEnglish
عنوان منشور المضيفBituminous Materials and Nonbituminous Components of Bituminous Paving Mixtures 2006
ناشرNational Research Council
الصفحات12-20
عدد الصفحات9
طبعة1962
رقم المعيار الدولي للكتب (المطبوع)0309099714, 9780309099714
المعرِّفات الرقمية للأشياء
حالة النشرPublished - 2006
منشور خارجيًانعم

سلسلة المنشورات

الاسمTransportation Research Record
الرقم1962
رقم المعيار الدولي للدوريات (المطبوع)0361-1981

ASJC Scopus subject areas

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