بررسی عملکرد سطحی آسفالت حفاظتی چیپ‌سیل بر روی اساس تثبیت‌شدۀ سیمانی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد،‌ دانشکده مهندسی عمران، دانشگاه یزد، یزد، ایران

2 دانشگاه یزد/دانشکده مهندسی عمران

چکیده

چیپ سیل باپخش مصالح دانه­ای بر روی قیر امولسیون برای حفاظت رویه‌های سطحی اجراء می شود. مهمترین خرابی چیپ‌سیل  کنده شدن سنگدانه از سطح رویه می­باشد در این مطالعه سعی شد برخی از این عوامل شامل نوع قیر، نوع دانه­بندی و درصد قیر در وقوع این خرابی بررسی شود. رویه‌ای که چیپ‌سیل بر روی آنها اجرا شده،  اساس تثبیت شده با سیمان و قیر مورد استفاده در این تحقیق شامل دو نوع قیر امولسیون و امولسیون با پودر لاستیک است و دانه­بندی مورد استفاده نشریه شماره 234 در طراحی چیپ‌سیل شامل سه نوع دانه‌بندی می‌باشد که در این تحقیق از دانه بندی نوع (ج) که ریز ترین دانه بندی می‌باشد استفاده شد. با توجه به اینکه سطح رویه تثبیت شده، یک سطح صاف و بدون خلل و فرج می‌باشد از یک نوع دانه بندی پیشنهادی که در مطالعه حاضر تحت عنوان دانه بندی نوع (د) مطرح شده است استفاده شد. در این تحقیق از آزمایش جاروب و آزمایش پخش ماسه برای بررسی عملکرد سطحی رویه بهره‌گرفته‌شد. از آزمایش جاروب برای مقایسه تاثیر نوع دانه­بندی، درصد قیر، نوع قیر و لایه زیرین چیپ سیل استفاده شد همچنین از آزمایش پخش ماسه به منظور بررسی نوع دانه‌بندی و تاثیر درصد قیر در عمق بافت چیپ‌سیل مورد استفاده قرار گرفت. نتایج حاصل از این تحقیق نشان داد که استفاده از قیر امولسیون با پودر لاستیک باعث کاهش تقریبا­ً20 الی 23 درصد از دست رفتن سنگدانه در سطح چیپ‌سیل می‌شود. همچنین میزان کنده‌شدن سنگدانه با ریزتر شدن دانه‌بندی رابطه مستقیم دارد و بطورمتوسط 14 درصد کاهش می‌یابد. همچنین نتایج حاصل از آزمایش پخش ماسه نشان داد که استفاده از چیپ سیل بر روی  اساس سیمانی باعث افزایش مقاومت لغزندگی رویه می‌‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Surface Performance of Chip Seal Layer on Cemented Base Treatment

نویسندگان [English]

  • A. Bourdunes 1
  • Mohammad Mehdi Khabiri 2
1 Department of Highway and Transportation, Civil Engineering Faculty, Yazd University, Yazd, Iran.
2 Civil Engineering Faculty,Yazd University
چکیده [English]

Chip-seal is one of the preliminary though successful ways to improve road surface of the pavement. Chip-seal is a byproduct of similar sized stones which pour in surface after emulsion bitumen wet the road surface. Chip-seal can deteriorate due to bleeding, aggregate streaking and aggregate removal. The first and second damages are sourced from improper design and implementation whereas the last damage is due to a lot of aspects and this study aims to investigate some of them. The effect of existing road surface, bitumen type, aggregate kind and bitumen percentage are examined in this study. The road surfaces which are evaluated in this research were cement treated base. In this research, two kinds of bitumen including: emulsion and rubber powder modified emulsion was used for chip-seal preparation. According to Iran road code numbered 234, two different mixture aggregate grading were recommended for chip-seal preparation. This study used the third aggregate grading which is generally finer compared to others. Also, in this research two different laboratory tests including; sweep tests and sand patch tests used for examination of the mixtures. The sweep tests were used for investigating the effects of aggregate grading kind, bitumen percentages, bitumen kind and the surface which chip-seal implemented. Also, the sand patch tests were used for investigating the effect of aggregate grading and bitumen kind on texture depth of chip-seal. Results of the laboratory tests indicated that rubber modified emulsion bitumen can decrease chip-seal aggregate removal by approximately 20%~23%. In addition chip-seal aggregate removal has a direct relationship with aggregate grading which results showed 14% decrease in aggregate removal when the finer aggregate grading was used. Moreover, results of sand patch tests indicated that chip-seal implementation of cement treated based can improve road surface friction resistance.

کلیدواژه‌ها [English]

  • Aggregate removal
  • Cemented treatment base
  • Chip Seal
  • Rubber modified emulsion
  • Sweep test
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