استفاده ازآزمایش مقاومت کشش و کنده شدن (Pull off)در تعیین مقاومت چسبندگی قیرهای امولسیونی اصلاح شده با شیره لاستیک SBR

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد رشته راه و ترابری، دانشگاه تربیت ‌مدرس

2 دانشیار، دانشکده مهندسی عمران و محیط‌زیست، دانشگاه تربیت مدرس، تهران، ایران

چکیده

امروزه وزن و حجم ترافیک به شدت افزایش یافته که باعث ایجاد خرابی‌های زیاد و نیازهای جدی جهت تعمیر و نگهداری و بهسازی روسازی‌های آسفالتی شده است. کاهش میزان چسبندگی بین قیر و سنگدانه‌ها و همچنین کاهش قدرت پیوستگی قیر موجود در مخلوط‌های آسفالتی که سنگدانه‌ها را به یکدیگر متصل می‌کند، باعث عریان شدگی مصالح سنگی و شن زدگی آسفالت می‌شود. ادامه این خرابی منجر به ایجاد چاله و خرابی‌های دیگر در روسازی می‌شود که برای رفع آن‌ها به انجام عملیات تعمیر و نگهداری اساسی نیاز خواهد بود. به منظور تعیین مقاومت چسبندگی میان قیر و سنگدانه‌ها در این تحقیق از آزمایش تعیین مقاومت کشش کنده شدن (Pull off) استفاده شد. نمونه‌ها شامل دو نوع قیر امولسیون کاتیونی زود­کن و کندشکن بودند که همچنین با مقادیر مختلف شیره لاستیک (SBR) مورد اصلاح قرار گرفتند. سنگدانه‌های مورد استفاده نیز متشکل از دو نوع سنگدانه گرانیتی و دولومیتی بودند که خصوصیات اجزاء تشکیل دهنده آن‌ها با انجام آزمایش XRF تعیین شد. در انجام پژوهش، تاثیر پارامترهای دما و زمان عمل‌آوری مورد بررسی قرار گرفت. نتایج نشان داد که اصلاح قیر امولسیون با 3 درصد شیره لاستیک موجب افزایش قابل توجه مقاومت چسبندگی و دوام نمونه‌ها گردید. همچنین مشاهده شد که تاثیر اندرکنش قیر امولسیون و نوع سنگدانه زیاد است. مقایسه تاثیر دو نوع سنگدانه فوق الذکر حاکی از آن بود که بین قیر و سنگدانه دولومیتی مقاومت چسبندگی بیشتری ایجاد شد. همچنین نتایج نشان داد که اثر دما و زمان عمل‌آوری در مقاومت چسبندگی قیر­های امولسیونی زیاد و این افزایش در نمونه‌های اصلاح شده با شیره لاستیک به مراتب بیشتر بود. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Application of Pull-off Test for Evaluating Bond Strength Properties of Modified Bitumen Emulsions

نویسندگان [English]

  • mohammad negarchi 1
  • Amir Kavussi 2
1 M.Sc. in Highway and Transportation Engineering, Faculty of Civil and Environmental Eng., Tarbiat Modares University
2 Associate Prof., Highway and Transportation Eng., Faculty of Civil and Environmental Eng., Tarbiat Modares University
چکیده [English]

Reduced adhesion properties between aggregate particles and bitumen binders, and reduced cohesion within the bitumen binders in asphalt mixes result in stripping and segregation distresses in road pavements. These will ultimately result in pothole formation and other severe distress in pavements. In this research, with the aim of determination of adhesion and cohesion properties between aggregate particles and bitumen binders, the pull-off testing method, which is commonly used in characterizing road marking materials, was used to determine tensile strength values that are created between aggregate particles and bitumen emulsions. Two conventional cationic bitumen emulsions of rapid and medium breaking types were used as control binders. These were then modified using a latex liquid additive at various percentages. Two aggregate types were used, namely granite and a dolomite type. Their mineralogy was determined using the XRF testing method. In addition, the role of other parameters, such as curing time and curing temperature, were determined too. Pull-off testing results showed that modification of bitumen emulsions with %3 latex provided increased adhesion properties and increased durability between bitumen emulsion and the two aggregate types that were selected in this research. It has also resulted that interaction between aggregate particles and the bitumen emulsions was great where latex modified bitumen emulsions were used. By comparing the role of the two aggregate types, it resulted that the dolomite aggregates provided superior adhesion properties. It was concluded that the role of curing time and temperature were dominant in providing adequate adhesion properties between bitumen emulsions and aggregate particles. The increase was more dominant in samples containing latex-modified bitumen emulsions.

کلیدواژه‌ها [English]

  • Bitumen bond strength
  • Bitumen emulsions
  • SBR latex
  • Aggregate types
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