ارزیابی آزمایشگاهی تأثیر استفاده از سرباره فولاد بر مشخصات آسفالت حفاظتی میکروسرفیسینگ

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس ارشد مهندسی عمران گرایش راه و ترابری، دانشگاه صنعتی نوشیروانی بابل، بابل، مازندران، ایران

2 دانشگاه صنعتی نوشیروانی بابل

چکیده

میکروسرفیسینگ مخلوطی از قیر امولسیون اصلاح شده پلیمری، مصالح سنگی شکسته با دانه‌بندی مناسب، فیلر معدنی، آب و افزودنی‌های شیمیایی است که در نگهداری پیشگیرانه روسازی‌ها استفاده می‌شود. یکی از اجزایی که تأثیر مهمی در عملکرد میکروسرفیسینگ دارد، مصالح سنگی بوده که حدوداً 82 تا 90 درصد وزن مخلوط را تشکیل می‌دهند. این پژوهش، نتایج آزمایشگاهی تأثیر استفاده از سرباره فولاد در بهبود مشخصات میکروسرفیسینگ را ارائه می‌دهد. لذا، از مصالح 100% سیلیسی به‌عنوان مخلوط شاهد استفاده شد. سپس، سرباره فولاد در مقادیر 5/42، 61 و 100 درصد جایگزین سنگدانه‌های مخلوط شاهد گردید. مخلوط‌های میکروسرفیسینگ توسط آزمایش‌های چسبندگی در 30 و 60 دقیقه، سایش در شرایط مرطوب در مدت زمان یک ساعت و میزان جابه‌جایی عمودی و جانبی با چرخ بارگذاری شده بررسی گردیدند. نتایج آزمایش­های چسبندگی‌ و سایش در شرایط مرطوب حاکی از آن بود که مخلوط‌های حاوی مصالح سرباره فولاد نسبت به مخلوط شاهد، به­دلیل برخورداری از خواص مکانیکی، فیزیکی و شیمیایی مطلوب، موجب بهبود عملکرد میکروسرفیسینگ شامل افزایش چسبندگی قیر به مصالح سنگی و افزایش مقاومت در برابر سایش می­شود. همچنین، در آزمایش تعیین میزان جابه‌جایی با چرخ بارگذاری شده، کمترین میزان جابه‌جایی در مخلوط حاوی 61% سرباره فولاد مشاهده شد، که نسبت به نمونه شاهد موجب کاهش جابه‌جایی عمودی و جانبی به ترتیب به میزان 65/45 و 35 درصد گردید.

کلیدواژه‌ها


عنوان مقاله [English]

Laboratory Investigation of the Steel Slag Aggregates Effect on Characteristics of Microsurfacing Surface Treatment

نویسنده [English]

  • Mahdi Zalnezhad 1
1 M.D. Highways and Transportation Engineering, Babol Noshirvani University of Technology, 4714871167, Iran
چکیده [English]

Microsurfacing is a mixture of polymer-modified emulsified asphalt, 100% manufactured well-graded fine aggregate, mineral fillers, water and chemical additives used in the preventive maintenance of pavements. One of the components that have a significant effect on the microsurfacing performance is aggregate, which comprises about 82 to 90 percent by weight of the mixture. This research presents experimental results with the aim of effecting the use of steel slag to improve microsurfacing characteristics. Therefore, in this research, 100% silica aggregate was used as a control mixture and then steel slag was replaced by 42.5%, 61% and 100% aggregate of control mixture. This study was carried out through wet cohesion test, wet track abrasion test and lateral displacement by loaded wheel test. The results of the wet cohesion test and wet track abrasion test indicated that mixtures containing steel slag aggregates compared to the control mixture due to the desired mechanical, physical and chemical properties, would improve the microsurfacing performance, including increasing the adhesion of bitumen to aggregate and increasing the abrasion resistance. Also, in the test of determining the displacement by the loaded wheel, the lowest displacement in the mixture containing 61% of the steel slag was observed and reduced the vertical and lateral displacement by 45.65% and 35%, respectively, compared to the control mixture.

کلیدواژه‌ها [English]

  • Microsurfacing
  • Steel Slag
  • Cohesion Test
  • Wet Track Abrasion Test
  • Loaded Wheel Test
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