بررسی تاثیر استفاده از سرباره فولاد و اندودهای سطحی مختلف بر عملکرد مقاومت برشی بین لایه‌ای روسازی مرکب

نوع مقاله : علمی - پژوهشی

نویسندگان

1 استاد، دانشکده عمران، دانشگاه سمنان، سمنان

2 عمران- دانشکده عمران دانشجوی دکتری، دانشکده عمران، دانشگاه سمنان، سمنان

چکیده

چسبندگی لایه­های روسازی مرکب، نقش بسزایی در عملکرد این نوع روسازی­ها در بلندمدت ایفا می­کند. چسبندگی ضعیف می­تواند سبب لغزش لایه­ها بر روی یکدیگر شده و خرابی­هایی نظیر ترک­های هلالی و خستگی زودرس را  ایجاد نماید. با توجه به اینکه سرباره بعنوان محصولی جانبی در تولید فولاد، مطرح می باشد. تحقیقات صورت گرفته در مورد تاثیر سرباره بر عملکرد بتن نشان می­دهد سرباره خصوصیات مکانیکی بتن را بطور قابل ملاحظه­ای افزایش می­دهد. بنابراین در این پژوهش از خصوصیات اصطکاکی و دوام سرباره فولاد استفاده کرده تا بتوان زبری سطح روسازی بتنی را افزایش داده و در نهایت چسبندگی لایه­های روسازی مرکب را ارتقاء داد. علاوه بر آن به منظور افزایش چسبندگی بین لایه­ای روسازی مرکب اثرات اندودهای سطحی مختلف شامل قیر 16-64PG  ، قیراصلاح شده با پودرلاستیک و زئولیت و قیر امولسیون تند شکن(CRS-1) با نرخ استفاده  3/0، 6/0، 9/0، 2/1 و 5/1 کیلوگرم بر متر مربع مورد بررسی قرار گرفت. در این تحقیق ابتدا درصد بهینه سرباره با توجه به آزمایش­های خصوصیات مکانیکی و همچنین آزمایش پاندول انگلیسی و سایش مطابق استاندارد EN 1338 انتخاب شد. سپس به منظور تعیین خصوصیات چسبندگی اندودهای سطحی از آزمایش برش مستقیم استفاده شد. نتایج بیانگر آن است که جایگزینی50 درصد سنگدانه با سرباره فولاد به لحاظ اقتصادی و خصوصیات مکانیکی و در عین حال سایش و لغزندگی عملکرد مناسبی داشته است. علاوه بر آن نتایج آزمایش مقاومت برشی روسازی مرکب نشان داد نرخ بهینه اندود سطحی بین 6/0 تا 9/0کیلوگرم بر مترمربع متغیر بوده و بستگی به نوع اندود سطحی دارد. با در نظر گرفتن مقادیر بهینه اندود سطحی، رده بندی مقاومت برشی قیرهای مختلف عبارتند از:  قیر امولسیون< قیر شاهد < قیرپودرلاستیکی حاوی زئولیت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the Effects of Steel Slag and Different Tack Coats on the Shear Strength of Composite Pavement Layers

نویسندگان [English]

  • Gholamali Shafabakhsh 1
  • Saeed Ahmadi 2
1 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 PhD. Student, Faculty of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

The adhesion between composite pavement layers plays a significant role in the long-term performance of these pavements. As it is known, a weak adhesion between the layers of pavements leads in slippage crack and early fatigue. Steel slag is a subsidiary product of iron melting furnace which can be used in pavement layers and concrete pavement. It is used in concrete pavement and caused an increment in the concrete pavement’s mechanical properties. Therefore, in this research, porous fabric of steel slag is used to increase the roughness of concrete pavement surface and thus increases the adhesion between composite pavement layers. In order to assess the effects of different tack coats including PG 64-16 bitumen, the crumb rubber bitumen contains natural zeolite and bitumen emulsion (CRS-1), direct shear test is conducted with usage rates of 0.3, 0.6, 0.9, 1.2, and 1.5 kg/m2. In order to measure the adhesion properties, the direct shear test was used and also to measure the roughness of the surface of the concrete pavements containing the steel slag, the British pendulum and abrasion tests were applied in accordance with EN 1338. The results of the experiments indicated that the replacement of 50% of steel slag with aggregate caused an increase in mechanical properties and also in accordance with the abrasion standard of EN 1338 it was in appropriate range in terms of wearing. In addition, the results of the composite pavement shear strength test showed that the optimum rate of applying tack coat was varied from 0.6 to 0.9 kg/m2 depending on the type of tack coat. Considering the optimum rate of the shear strength ranking for different bitumen between composite layers was as follows: emulsion bitumen< control bitumen< crumb rubber with zeolite modified bitumen.

کلیدواژه‌ها [English]

  • Composite pavement
  • tack coat
  • abrasion resistance
  • shear strength
  • steel slag
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