تعديل البيتومين المحلي لاستخدامه في خلطات بيتومينية خاصة بمهابط المطارات
Abstract
أجري هذا البحث لتحسين خاصية مقاومة البيتومين للكيروسين، الذي قد تتعرض له طبقة التغطية البيتومينية في المطارات، ولهذا الهدف تم اختيار الـ (Styrene Butadiene Styrene) SBSوالـEN1 كمحسنات للبيتومين، وأضيف الـSBS بنسبة 3.5% والـEN1 بنسبة %6. أجريت بعض التجارب لتحديد خواص البيتومين المعدل وغير المعدل، وكانت النتائج ضمن حدود المواصفات، تم غمر عينات البيتومين بالكيروسين ولوحظ تحسن واضح في عدم انحلال العينات المعدلة، وتم تجهيز عينات من الخلطة البيتومينية وفق طريقة مارشال لكل من أنواع البيتومين المستخدم في بحثنا، وأجريت عليها الاختبارات اللازمة وأعدت عينات وفق النسبة المثالية من البيتومين وغمرت بالكيروسين لمدة24h ورغم أنها لم تحقق شرط ألا يزيد النقص في وزنها بعد الغمر عن 1% إلا أن مقدار التحسن ملموس وجدير بالإهتمام, وقمنا بتجهيز عينات من الخلطة وغمر سطحها العلوي لمدد مختلفة ولم يتجاوز النقص في الوزن 0.24% للخلطات المعدة من بيتومين معدل بالـSBS و0.23% للخلطات المعدلة بالـEN1 في حين كان النقص في وزن العينات غير المعدلة 2.4% أي أن مقدار التحسن هو بحدود عشرة أضعاف.
This research was done to improve the resistance quality of Bitumen to Kerosene, which may leak to get to the bituminous layer covering runways. For this purpose, SBS and EN1 were selected as improving materials to bitumen according to the following
rates: 3.5% for SBS and 6% for EN1. Some experiments were made to determine the qualities of modified and unmodified bitumen; the results obtained were up to the specifications set. It was noticed, after immersing samples of Bitumen in Kerosene, that there was a significant improvement represented by the dissolution of the modified samples. According to Marshal's method, samples of Bituminous mix were prepared for all the Bituminous types used in this research. These samples were put to the required tests, and samples were prepared according to an ideal rate of Bitumen; they were also immersed in Kerosene for 24 hours. Although, they didn't satisfy the condition of not having increased their weights to exceed 1% following immersion, the improvement rate was tangible and significant. We also prepared Samples of the mix; then they were immersed for different periods; the result was as follows: The lack of weight was 0.24% for the Bitumen mix modified by adding SBS, and 0.23% for the one modified by adding EN1, whereas the lack of weight in the unmodified samples was 2.4%. This meant that the rate of improvement became tenfold better.
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