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Article
Effect of Adding Used-Foundry Sand on Hot Asphalt Mixtures Performance

Authors: Hasan Hamodi Joni --- Hussein HamelZghair
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (A) Engineering Pages: 1253-1264
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Highway material researchers have been investigating the use ofbyproduct materials such as used-foundry sand as a fine aggregate and mineral filler in asphaltic concrete mixtures to replace the traditional asphalt mixes by new one contain this type of sand. This researchshow a study using of used-foundry sand as an alternative to filler and fine aggregate in hot asphalt mixture, aims to minimize the environmental effect caused by this waste materials. To evaluate mechanical properties, the mixtures were designedby Marshall method which contain the used- foundry sand and determine indirect tensile strength ratio and then compared with hot asphalt mixtures contained of two types of filler(ordinary cement and limestone dust).The results showing that the reuse of foundry sand in the mixtures of hot mix asphalt as a partial replacement of fine aggregate that retained on sieve No 200 and a total replacement of filler material is viable and can be used in asphalt mixtures production. The hot asphalt mixtures containing of used-foundry sand with cement filler type improved the moisture sensitivity performance as characterized in indirecttensile strength ratio. Furthermore, that theresults obtained from Marshall stability test indicate maximum Marshall stability obtained for mixtures with cementand used-foundry sand more than these stabilities for mixes with used-foundry sand and lime stone dustas a filler were (15.3, 12.5 and14.1) respectively .


Article
The Effect of SBS Content on The Warm Asphalt Concrete Mixtures Performance

Author: Hayder Abbas Obaid
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2018 Volume: 26 Issue: 1 Pages: 324-330
Publisher: Babylon University جامعة بابل

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Abstract

Warm mix asphalt (WMA) represents a number of technologies used to decrease the mixing and compaction temperature. The reduction in temperature has many advantages such as: lower cost to produce such as mixtures, and environmental effects. In Iraq the WMA technology consider a new technology can be sued for the next years. The main objective for this research is to study the effect of polymer on the performance of WMA. In this study, three kinds of asphalt mixtures were used: Hot Mix Asphalt (HMA), Warm Mix Asphalt (WMA), and Polymer Modified WMA. The WMA has produced by adding Aspha- min® at rate 0.3%, and for WMA modified by SBS they contain SBS with rate (0.5-3.5) %.The performance tests consist on: Indirect Tensile Strength Ratio Test (moisture susceptibility), and Wheels – Track Test (rutting resistance). The results of these tests have indicated that, performance of HMA better than WMA, and the adding of SBS to WMA improve their performance. However, the using of SBS at rate (3%) and more improve the WMA performance against moisture damage and rutting.

الخلطات الاسفلتيه الدافئه تمثل مجموعة التقنيات التي تساعد على تخفيض درجة حرارة المزج والحدل. ومن فوائد هذا التقليل في درجة الحراره : انخفاض كلفة انتاج هكذا نوع من الخلطات ,اضافة الي ذلك التاثير البيئي الجيد حيث تعتبر صديقة الي البيئه.و في العراق تعتبر الخلطات الاسفلتيه الدافئه من الوسائل الحديثة والغير مجربه, ويمكن استعمالها في السنوات القادمه. تهدف هذه الدراسه الي معرفة مدى تاثير محتوى المواد الملدنه على كفاءه هذه الخلطات. ومن اجل ذلك استعملت ثلاثة انواع من الخلطات وهي: الخلطات الاسفلتيه الحاره , الخلطات الاسفلتيه الدافئه, والخلطات الاسفلتيه الدافئه والمطوره بمادة SBS.بنسبه(0.5-3.5)%. واشتملت فحوصات تقييم الاداء على : فحص نسبة الشد الغير مباشر(فحص حساسية الماء), وفحص العجلة المتحركه(فحص عمق التخدد). اشارة نتائج هذه الفحوصات : الكفاءه الجيده للخلطات الاسفلتيه الساخنه مقارنة مع الخلطات الاسفلتيه الدافئه, والتاثير الجيد لمادة SBS على تحسين اداء الخلطات الاسفلتيه الدافئه المطوره.وبصورة عامة ,عند استعمال نسبة 3% من مادة SBS واكثر تحسن من اداء الخلطات الاسفلتيه الدافئة لمقاومة الاثر الضارللماء, وتزيد من مقاومة الخلطه الاسفلتيه للتشوهات الدائميه المتمثلة بالتخدد.

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