التقييم النوعي للإسفلت المحلي المعدل ببوليمر ستيرين-بيوتادين- ستيرين

محتوى المقالة الرئيسي

Rania I. Al-Nawasir
https://orcid.org/0009-0003-6351-0745
Basim H. Al-Humeidawi
https://orcid.org/0000-0002-1566-5983

الملخص

هناك حاجة إلى حلول لبنية تحتية أكثر أمانًا واستمرارية في ضوء زيادة حركة المرور والطقس القاسي في العراق. تتمثل أكبر التحديات في حماية الطرق وصيانتها في انخفاض مقاومة الرصيف للأحمال الديناميكية وقصر مدة خدمتها؛ ونتيجة لذلك، يتم إنفاق مبالغ ضخمة كل عام لتعزيز قدرات خدمات الطرق في العراق. تسمح البوليمرات الكهربية اللدنة الحرارية لتعديل البيتومين بإنشاء طرق طويلة الأمد وفعالة من حيث التكلفة. تهدف هذه الدراسة إلى معرفة كيف تتغير الخصائص الميكانيكية للإسفلت النقي عند إضافة بوليمر ستيرين-بيوتادين- ستيرين (SBS) كمعدِّل. يتضمن البحث الحالي التحقيق في إضافة ثلاث نسب مئوية من SBS (3 و5 و7 ٪ من وزن البيتومين). خضع كل من البيتومين النقي والمعدّل بالبوليمر (PMB) لسلسلة من الفحوصات المختبرية الفيزيائية والفحوصات الريولوجية Superpave، بما في ذلك اختبار مقياس القص الديناميكي (DSR) واختبارأستقرارية التخزين. بالإضافة إلى ذلك، تم إجراء اختبار تحليل كيميائي لتحديد أي تغيير في التركيب الكيميائي للمادة الرابطة النقية عند إضافة بوليمر SBS. أشارت النتائج إلى أن 5٪ من بوليمر SBS هي النسبة المثلى للإضافة إلى الأسفلت المحلي في العراق. بالإضافة إلى ذلك، فهو يقلل من قابلية البيتومين للتغيرات في درجات الحرارة ويعزز خصائصه في جميع الاختبارات المعملية. يتميز PMB بمعامل جيد للتشقق والتخدد وهو أعلى بكثير من الأسفلت العادي. بناءً على فحص القص الديناميكي DSR واختبارأستقرارية التخزينstorage stability، فإن نسبة 5٪ تفي بمتطلبات الصنف PG76-10 المستخدم في المحافظات الوسطى والجنوبية من العراق. أثبتت النتائج أن استخدام بوليمر SBS في الطبقة السطحية في العراق يقلل من الأضرار التي تحدث على الطرق بسبب شمس الصيف الحارقة، ويقلل من احتمالية التشقق والتخدد، ويعمل بشكل جيد في المناطق الحارة، مما ينتج عنه طرق تدوم لفترة أطول، وتوفر قيادة مريحة، وتتطلب صيانة أقل.

المقاييس

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تفاصيل المقالة

القسم
Articles
السيرة الشخصية للمؤلف

Rania I. Al-Nawasir، Department of Roads and Transport Engineering, College of Engineering, University of Al-Qadisiyah, Al-Diwaniyah, Iraq.

           باحثة وم. مهندس /وزارة الأعمار والأسكان

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