استفاده از پودر ضایعات زغال سنگ و آهک در مخلو طهای آسفالتی بازیافت شده با قیرامولسیون

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل

2 دانشجوی کارشناسی ارشد مهندسی عمران، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل

چکیده

در این پژوهش از پودر باطله زغال سنگ، به صورت طبیعی و خاکستر به عنوان افزودنی در مخلوط بازیافت شده با قیرامولسیون استفاده شد. همچنین پودر آهک نیز به صورت جداگانه و ترکیبی در مخلوط بازیافت شده بکار رفت. عملکرد مخلوط های مورد مطالعه به وسیله آزمایشهای مارشال، مقاومت کششی غیرمستقیم، حساسیت رطوبتی و مدول برجهندگی ارزیابی شد. نتایج ارزیابی های آزمایشگاهی نشان داد که استفاده از باطله زغال سنگ و خاکستر آن سبب بهبود ویژگیهای مکانیکی مخلوط می شود ، به طوری که استقامت مارشال، مقاومت کششی و مدول برجهندگی مخلوط افزایش می یابد. البته اثرات استفاده از خاکستر باطله زغال سنگ بر ویژگیهای مکانیکی مخلوط با توجه به وجود مواد پوزولانی بیشتر در ترکیب شیمیایی آن، مشهودتر است. افزون بر این استفاده از خاکستر باطله زغال سنگ توانست حساسیت رطوبتی مخلوط بازیافت شده را کاهش دهد، در حالی که بکارگیری باطله زغال سنگ سبب افزایش حساسیت رطوبتی مخلوط شد. نتایج نشان داد افزودن 3 درصد آهک به مخلوط بازیافت شده حساسیت رطوبتی را به صورت چشمگیری کاهش می دهد. همچنین از آهک می توان به عنوان مکملی برای باطله زغال سنگ و خاکستر آن استفاده کرد، زیرا نتایج نشان داد که در اثر وقوع واکنش های سیمانی مخصوصاً در درازمدت، ویژگی های مکانیکی و دوام مخلوط بهبود می ی‏ابد.

کلیدواژه‌ها


عنوان مقاله [English]

Application of Coal Waste and Lime in Recycled Mixtures with Bitumen Emulsion

نویسندگان [English]

  • Amir Modarres 1
  • Pouyan Ayar 2
چکیده [English]

Technical, environmental and economic advantages of pavement cold recyclingtechnology are good signs of an efficient method for asphalt concrete pavements rehabilitation.  Nowadays, additives are used for improving the implementation situation and upgrading the performance of cold recycled mixtures. The increasing costs of preparing the common additives such as cement and lime, and also the pollutants that result from their production processes were among the most important reasons for widely using waste additives like fly ash. In this study cold waste powder in its natural and ash form was used as an additive in the cold recycled mixture with bitumen emulsion. In addition, lime powder was separately and as a compound was used in the cold recycled mixtures. The performance of the studied mixtures was assessed by Marshall, indirect tensile strength, moisture sensitivity and resilience modulus tests. The test results showed that using coal waste and its ash, improved the mechanical features of the mixture in a way that Marshal stability, tensile strength and resilience modulus were also increased. As the matter of fact, the effects of using coal waste ash on the mechanical features of the mixtures was obviously related to the existence of more Pozzolanic materials in its chemical compounds. Further, the application of coal waste ash, reduced the moisture sensitivity of the mixture, while using coal waste caused an increase in the mixture's moisture sensitivity. Moreover, the results showed that adding 3% of lime to the recycled mix significantly caused a decrease in the moisture sensitivity. Also lime can be used as a complement for coal waste and its ash because the results showed improvement of the mechanical features and the durability of the mixture due to the occurrence of cementitious reactions specifically in the long-term. 

کلیدواژه‌ها [English]

  • Recycled asphalt mixture
  • Bitumen Emulsion
  • coal waste
  • Coal Waste Ash
  • lime
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