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Article
Improvement of the Specification of the Asphalt Concrete Overlay by Using Polypropylene

Author: Hayder Salman Khudhair
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2018 Volume: 26 Issue: 6 Pages: 199-219
Publisher: Babylon University جامعة بابل

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Abstract

The research aims to prepare high-performance asphalt concrete with good specifications for using in asphalt concrete overlay can resist deformations and problems faced and increase its age service. Used all of polypropylene particles as an additive to the asphalt concrete type (AC 60-70) by six ratios (1, 2, 3, 4, 5 and 7) % of optimum asphalt content weight, as an additive for asphalt mixture with a maximum size of the aggregate (19mm). Study the effect of these additions on the volumetric and the mechanical properties of the asphalt concrete and evaluate its performance through Marshall Method test by take at least three specimens of ratio tested. The results showed that the use of polypropylene particles improvethe performance and specifications of asphalt concrete and increase the ability to resist deformations that are exposed, where it was concluded that the addition of ratio (4%) of the weight of the asphalt of polypropylene gives optimum improvement of the performance of the asphalt concrete overlay, where Marshall stability is increased by 47% and flow decreased by 17% compared to untreated mixtures respectively, with volumetric properties within limitations of the specifications.

يهدف البحث إلىإعداد خلطة إسفلتية عالية الأداء تتمتع بمواصفات جيده لاستخدامها في طبقة التقوية تستطيع مقاومة المشاكل والعيوب التي تتعرض لها وتزيد من عمرها الخدمي. حيث استخدمت حبيبات البولي بروبلين كماده مضافة للرابط الإسفلتينوع. ((AC 60-70بسته نسب (1, 2, 3, 4, 5, 7) % من وزن النسبة المثلى للإسفلت مع استخدام ركام ذو المقاس الأعظم 19 ملم. تم دراسة تأثير هذه الإضافات على الخصائص الحجمية والميكانيكية وتقييم أداء الخلطة باستخدام فحص مارشال وبأخذ مالايقل عن 3 نماذج لكل نسبة. بينت الدراسة ان استخدام 4% من حبيبات البولي بروبلين من وزن الإسفلت المثلى أعطت التحسين الأمثل بالاداء مقارنة مع الخلطة المرجعية غير المعالجة حيث زاد ثبات مارشال بنسبة 47% ونقص مقدار الانسياب بمقدار 17% مقارنه بالخلطة المرجعية. كما بينت النتائج ان اضافة مثل هكذا نسبة اعطت خلطة ذات مواصفات حجمية ضمن حدود المواصفة.


Article
EVALUATING THE PERFORMANCE OF ASPHALT RIENFORCEMENT LAYER COMPRISING POLYPROPYLENE GRANULES

Authors: Hayder Salman Khudhair --- Mustafa Amoori Kadhim
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2018 Volume: 11 Issue: 2 Pages: 278-292
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

Despite the widespread use of hot mix asphalt (HMA) Overlay as one of the most important methods of pavement maintenance, rehabilitation and development of roads, also the ease and speed of implementation and low costs, there are many disadvantages and problems that accompany the use, which is mostly due to reflection of the defects of layers the old pavement on which the asphalt reinforcement layer is based. Therefore, this study aims to prepare an asphalt mixture with a high performance and good specifications as overlay layer, which can resist the problems and defects that are exposed to it and increase its service life. Polypropylene granules of 19 mm particles size were used as an additive to the asphalt binder (AC 60-70), with percentages 1, 2, 3, 4, 5 and 7% of the optimum asphalt content weight. The volumetric and mechanical characteristics of mixture with this addition were evaluated by using Marshall stability and indirect tensile testing (ITS). The study showed that the use of 4% of the polypropylene granules of optimum asphalt weight gave optimal performance compared to the unmodified mix. The optimum performance of the asphalt concrete overlay during its design life, especially at high temperatures, was improved by improving the physical and mechanical properties of the asphalt mixture and by increasing its resistance to stresses is 32%.

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