IJE TRANSACTIONS A: Basics Vol. 26, No. 10 (October 2013) 1183-1190   

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M. Ghasemi and S. M. Marandi
( Received: December 17, 2012 – Accepted: April 18, 2013 )

Abstract    In this paper, the effect of adding recycled glass powder (RGP) as a third component in polymer modified bitumen is studied. RGP and styrene butadiene rubber (SBR) is added to the base bitumen in order to prepare modified binders and mixtures. The initial study is performed to determine physical properties of unmodified, SBR modified and RGP-SBR modified asphalt binders which prove RGP's compatibilizing effect on asphalt and polymer as well as high compatibility between RGP and polymer leading to better dispersion of the polymer in asphalt. The results of the study showed how final rheological properties of the mentioned combination could be affected by adding RGP and SBR. Modified and unmodified binders are used for preparing the Marshall samples for the following tests: Marshall Strength, indirect tensile strength (ITS), tensile strength ratio (TSR), and indirect tensile stiffness modulus (ITSM) tests. The results of this study indicated that the combination of 3% SBR plus 2% RGP can improve mechanical properties of asphalt mixture considerably.


Keywords    Bitumen, Recycled glass powder, SBR, ITS, TSR, ITSM


چکیده    در این مقاله اثرات پودر شیشه بازیافتی (RGP) بعنوان جزء سوم افزودنی در قیر پلیمری مورد مطالعه آزمایشگاهی قرار گرفته است. جهت تهیه قیرها و مخلوط های اصلاح شده به قیر پایه RGP و استایرن بوتادین رابر (SBR) افزوده شدند. تحقیقات اولیه که برای تعیین خواص فیزیکی قیرهای اصلاح نشده، اصلاح شده با SBR و اصلاح شده با RGP-SBR انجام شدند، اثر سازگار کردن RGP را ثابت کردند که سازگاری بالا بین RGP و پلیمر سبب توزیع بهتر پلیمر در قیر میگردد. نتایج این تحقیق نشان دادند که خواص رئولوژیکی نهایی ترکیب مذکورتحت تاثیر افزودن RGP و SBR قرار می گیرد. قیرهای اصلاح شده و اصلاح نشده برای تهیه نمونه ها و برای انجام آزمایشات استقامت مارشال، مقاومت کششی غیرمستقیم، نسبت مقاومت کششی و مدول سختی کششی غیرمستقیم مورد استفاده قرار گرفتند. نتایج نشان داده است که ترکیب سه درصد SBR و دو درصد RGP می تواند خواص مکانیکی مخلوط آسفالتی را بطور قابل توجهی بهبود بخشد.


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