Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 9 (September 2018) 1514-1520    Article in Press

PDF URL: http://www.ije.ir/Vol31/No9/C/6-2871.pdf  
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  MODIFICATION OF THE PROPERTIES OF WARM MIX ASPHALT USING RECYCLED PLASTIC BOTTLES
 
M. Mosa, I. T. Jawad and L. A. Salem
 
( Received: March 13, 2018 – Accepted in Revised Form: April 26, 2018 )
 
 

Abstract    The construction of flexible pavements with hot mix asphalt (HMA) consumes considerable energy, which impacts global resources and environment. Warm mix asphalt (WMA) is an effective alternative because it is produced with mixing and compaction temperatures lower than those used in HMA production. This technology decreases energy consumption, saves money and reduces the environmental pollution. Moreover, this technology can generate a revolution in sustainable construction if combined with the use of waste materials to improve the properties of WMA. Polyethylene terephthalate (PET) wastes are increasingly accumulated over the world. However, to the best of knowledge of authors, no research has adopted using PET wastes in combination with improving WMA properties. Therefore, the present study covers the usage of PET waste bottles to modify the properties of WMA. Ground PET waste bottles with a maximum particle size of 2.36 mm with different contents (0.1, 0.3, 0.5, 0.7, 0.9 and 1.1% by the weight of aggregate) were used to replace an equivalent portion of fine aggregate. Laboratory tests were conducted to investigate the effects of different PET contents on the properties of WMA. The testing programme included Marshall, rutting susceptibility and indirect tensile strength (ITS) tests. Results exhibited significant improvements in the engineering properties of the mixtures modified with the optimum PET content (which was found to be 0.5%) in terms of increase in stability, stiffness, ITS and moisture damage resistance and decrease in rutting susceptibility, without adverse effects on the other desirable properties of the mixtures.

 

Keywords    Polyethylene Terephthalate Waste, Marshall Properties, Rutting Susceptibility, Warm Mix Asphalt

 

چکیده   

در پروژه‫های راه‌سازی ساخت روکش‫های انعطاف‌پذیر با مخلوط آسفالت داغ انرژی زیادی را صرف می‫نماید که این امر تاثیر بسزایی بر روی منابع و محیط زیست جهان خواهد داشت. لذا روش آسفالت مخلوط می‫تواند یک جایگزین موثر و مطلوب باشد چرا که در این روش نسبت بروش آسفالت داغ، تولید و مخلوط کردن آسفالت با دمای نسبتاً پایین‫تر صورت گرفته و تراکم مناسب صورت می‫پذیرد. این روش (تکنولوژی) باعث کاهش مصرف انرژی، صرفه‌جویی در هزینه و کاهش آلودگی محیط زیست می‫گردد. روش آسفالت مخلوط اگر همراه با استفاده از مواد زائد برای بهبود خواص آسفالت مخلوط باشد می‫تواند انقلابی در ساخت و ساز پایدار در راه‌سازی ایجاد نماید. ضایعات پلی اتیلن تترافتالین بطور فزآینده‫ای در سراسر جهان انباشته شده است. لازم به توضیح است که تاکنون تحقیق مناسبی درخصوص استفاده از مواد دور ریز در راستای بهبود خواص آسفالت مخلوط صورت نپذیرفته است. بنابراین مطالعه حاضر، استفاده از ضایعات پلی اتیلن تترافتالین برای تغییر خواص آسفالت مخلوطی را پوشش می‌دهد. برای بررسی بهبود خواص آسفالت مخلوطی استفاده از ضایعات با حداکثر اندازه ذرات 3/2 میلی‫متر با درصدهای وزنی مختلف (1/0، 3/0، ۵/0، 7/0، 9/0 و 1/1 درصد وزنی مواد جامد) استفاده گردید. این مطالعه شامل تعدادی تست‌های آزمایشگاهی برای بررسی اثرات محتوای مختلف بر خواص بود که این آزمایشات شامل آزمایش مارشال و آزمایش حساسیت به چرخش بود. نتایج به دست آمده نشان‌دهنده بهبود قابل توجهی در خواص مهندسی شامل افزایش پایداری و سختی و کاهش حساسیت چرخش بدون عوارض جانبی مخلوط‌های اصلاح شده با محتوای با مقدار بهینه ۵/0 درصد مواد گزارش شده است.‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

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