اثر غلظت و اندازه پودر لاستیک بر خواص رئولوژیکی و انعطاف‌پذیری قیر

نوع مقاله: پژوهشی

نویسنده

اسلامشهر، دانشگاه آزاد اسلامی، واحد اسلامشهر، دانشکده علوم پایه، گروه شیمی، صندوق پستی 1194-19615

10.22063/jipst.2020.1702

چکیده

فرضیه: سالانه مقدار بسیار انبوهی از تایر ضایعاتی در محیط زیست دور ریخته می‌شوند. از آنجا که فرایند تخریب مواد تایر بسیار زمان‌بر است، باید راه حل دوستدار محیط زیست برای بازیافت تایرهای ضایعاتی یافت شود. راهکارهای مختلفی برای اصلاح خواص مکانیکی و فیزیکی قیر یا آسفالت با پودر لاستیک پیشنهاد شده است. نتایج این مطالعات نشانگر اثر مثبت پودر لاستیک بر خواص قیر بوده است. بنابراین منطقی به‌نظر می‌رسد، غلظت و اندازه پودر لاستیک بر خواص قیر اثرگذار باشد.
روش‌ها: اثر غلظت (مقدارهای 3، 7 و %10 وزنی) و اندازه پودر لاستیک (0.1، 0.3، 0.6 و 1mm) بر گرانروی و خواص فیزیکی و رئولوژیکی آمیخته‌های قیر-لاستیک بررسی شد. افزون بر این، برای تصمیم‌گیری بهتر درباره استفاده از پودر لاستیک برای قیر، گرانروی قیر اصلاح‌شده نیز مطالعه شد.
یافته‌ها: نتایج نشان داد، افزایش غلظت پودر لاستیک و کاهش ابعاد پودر لاستیک موجب بهبود انعطاف‌پذیری در سرما و خواص رئولوژیکی قیر شد. افزایش غلظت پودر لاستیک تا %10  وزنی انعطاف‌پذیری قیر را از 20 به کمتر از 10 درجه سلسیوس کاهش داد و حتی در اندازه‌های کوچک‌تر پودر لاستیک (0.1mm)، انعطاف‌پذیری به حدود 8 درجه سلسیوس کاهش یافت. همچنین، در غلظت بیشتر و اندازه کوچک‌تر پودر لاستیک، مقاومت در برابر شیاردارشدن قیر از 35 به حدود 60 درجه سلسیوس افزایش یافت. با وجود این، نتایج گرانروی نشان داد، غلظت‌های بیش از %7 وزنی پودر لاستیک، گرانروی قیر را افزایش داده و کاربرد آن را محدود کرده است. بنابراین، افزودن تا %7 وزنی پودر لاستیک با اندازه کوچک‌تر از 0.1mm می‌تواند خواص فیزیکی و مکانیکی قیر را بهبود بخشد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Concentration and Size of Crumb Rubber on Rheological and Cold Bending Properties of Bitumen

نویسنده [English]

  • Vahid Haddadi
Department of Chemistry, Islamshahr Branch, Islamic Azad University, P.O. Box19615-1194, Islamshahr, Iran
چکیده [English]

Hypothesis: Annually, large amounts of waste tire are disposed into environment. Since decomposition process of these tire materials takes a long time, the governments have imposed regulations to find environmentally-friendly solutions to recycle the waste tires. There are different approaches to take on the modification of physical and mechanical properties of bitumen or asphalt with crumb tires. The results of those studies have illustrated positive effect of crumb rubber on bitumen properties. Therefore, it is reasonable that concentration and size of crumb rubber could affect the bitumen properties.
Methods: The effect of concentration (3%, 7% and 10 wt%) and size (1, 0.6, 0.3 and 0.1 mm) of crumb rubber was considered on the viscosity, physical and rheological properties of bitumen/rubber blends. Furthermore, to better decide on the use of crumb rubber for bitumen, the viscosity of modified bitumen was studied.
Findings: The results of this study identified that high concentration and smaller dimension of crumb rubber improved cold flexibility and rheological properties of bitumen. Increasing in crumb rubber concentration to 10 wt% resulted in lowering flexibility temperature of bitumen from 20°C to 10°C and even, in smaller sizes (0.1 mm) the flexibility diminished to 8°C. Furthermore, this research showed that at higher concentration and smaller size of crumb rubber the resistance to rutting of bitumen enhanced from 35°C to 60°C. However, the viscosity results showed that a high level of crumb rubber (above 7 wt%) increased the viscosity dramatically and restricted its application. So, adding 7 wt% of crumb rubber with a size of less than 0.1 mm can optimize the physical and mechanical properties of bitumen.

کلیدواژه‌ها [English]

  • bitumen
  • concentration and size of crumb rubber
  • rheological properties
  • flexibility at cold temperature
  • dynamic viscosity
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