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الرئيسية > Changes in Chemmical Compositi...>الوصف

Changes in Chemmical Composition of Asphalt Binder in Hot Arid Climates

المصدر: المجلة الجامعة
الناشر: جامعة الزاوية - مركز البحوث والدراسات العليا
المؤلف الرئيسي: Albackush, Kamal T. (Author)
المجلد/العدد: مج18, ع3
محكمة: نعم
الدولة: ليبيا
التاريخ الميلادي: 2016
الشهر: أغسطس
الصفحات: 109 - 124
رقم MD: 1263881
نوع المحتوى: بحوث ومقالات
اللغة: الإنجليزية
قواعد المعلومات: EduSearch, EcoLink, IslamicInfo, AraBase, HumanIndex
مواضيع:
تركيب الكيميائي | تصنيع الإسفلت | المواد الكيميائية | المواد البيتومينية
رابط المحتوى:

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المستخلص: One of the main distresses affecting asphalt pavement is the premature surface cracking. This problem has been observed in hot arid climates such as North Africa and the Middle East. In these climates, a complex change in the composition of the asphalt binder occurs. These changes affect the binder properties by increasing the binder viscosity, stiffness and softening point and reducing penetration and ductility. However the loss of flexibility in the binder will make the asphaltic mix susceptible to shrinkage cracking in the large temperature ranges that occur in these climates. An experimental program has been carried out to evaluate the process of hardening by monitoring the changes in asphalt composition. Two sets of samples were collected: the first set (fresh asphalt) was collected from Zawia refinery; the second set was collected from selected sites in the southern part of Libya, to find out the effect of hardening due to ageing and exposure to solar radiation at different depths from the surface. Field samples ranged in age from 0 to 23 years, each sample was sawn into slices of 20 mm thick through its depth to represent the change of exposure to environmental effects. A chromatographic column was used for determining the asphaltene content and chemical composition of asphalt. The results showed that asphalt binders in hot arid climates subjected to a rapid process of hardening reflected in high changes in chemical composition.

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