بررسی امکان استفاده از مصالح خرده آسفالت بازیافتی و سرباره فولاد به عنوان جایگزین بخشی از مصالح در روسازی‌های بتن غلتکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی عمران، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران

2 گروه مهندسی عمران، دانشکده فنی مهندسی، واحد آیت الله آملی، دانشگاه آزاد اسلامی، آمل، ایران

3 گروه عمران، دانشکده فنی مهندسی، واحد آیت الله آملی، دانشگاه آزاد اسلامی، آمل، ایران

چکیده

یکی از مسائل مهم حال حاضر جهان در صنعت ساخت و ساز، مسأله بازیافـت است. امروزه استفاده از انواع مختلف بتن‌ در پروژه‌های عمرانی، امری متداول است. یکی از انواع این بتن‌ها بتن غلتکی می‌باشد، که دارای مزایایی از قبیل اجرای سریع و آسان، هزینه های کمتر اجرا و مقاومت در شرایط آب و هوایی گرم و تحت بارگذاری سنگین است. این بتن در ساخت روسازی‌های راه و انواع سازه‌های حجیم قابل استفاده می‌باشد. در این پژوهش به بررسی تاثیر جایگزینی مصالح خرده آسفالت بازیافتی به عنوان مصالح درشت دانه و سرباره فولاد به عنوان مصالح ریزدانه با درصدهای متفاوت بر مشخصات مکانیکی بتن‌ غلتکی پرداخته شده است. نمونه‌ها پس از طرح اختلاط، به مدت 7 و 28 روز عمل‌آوری شدند. نتایج آزمایش‌ها نشان می‌دهد که با افزایش جایگزینی مصالح خرده آسفالتی و سرباره فولاد در نمونه های بتن غلتکی، مقاومت فشاری به صورت قابل ملاحظه‌ای کاهش یافته است؛ به‌طوری که مقاومت فشاری در نمونه حاوی صد در صد مصالح بازیافتی و سرباره، تقریباً یک سوم مقاومت فشاری نمونه شاهد شده است؛ اما، در مقاومت کششی و خمشی این آهنگ کاهش، کندتر شده است. همچنین، تنها نمونه حاوی 25% مصالح خرده آسفالتی و سرباره، حداقل مقاومت فشاری لازم را مطابق با استانداردهای مربوطه داراست؛ در حالی که مقاومت کششی و خمشی 28 روزه در نمونه‌های حاوی 25%، 50% و 75% مصالح خرده آسفالتی و سرباره، بالاتر از مقادیر مجاز مطابق با استانداردها می‌باشد. نتایج آزمایش چقرمگی نشان داد که با افزایش مصالح خرده آسفالتی و سرباره فولاد، مقدار بار حداکثر کاهش یافت؛ ولی با توجه به افزایش انعطاف پذیری مخلوطهای بتن غلتکی، قابلیت جذب انرژی و به تبع آن چقرمگی افزایش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Possibility of Using Recycled Asphalt Pavement (RAP) and Steel Slag as a Substitute for Part of the Materials in Roller Compacted Concrete (RCC) Pavements

نویسندگان [English]

  • Mohsen Amouzadeh Omrani 1
  • Ali Hassan nezhad 2
  • Vahid Shahbazi 3
1 Assistant Professor, Department of Civil Engineering, Savadkooh Branch, Islamic Azad University, Savadkooh, Iran
2 PhD Student, Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran
3 Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran
چکیده [English]

Recycling is one of the most important issues in the construction industry in the world. Today, it is common to use different types of concrete in construction projects. One of these types of concrete is Roller Compacted Concrete (RCC), which has advantages such as fast and easy construction, lower construction costs and resistance in hot weather conditions and heavy loading. This concrete can be used in the construction of road pavements and all kinds of massive structures. In this study, the effect of replacing reclaimed asphalt pavements (RAP) as coarse aggregates and steel slag as fine aggregates with different percentages has been investigated on the mechanical properties of roller concrete. Samples were cured for 7 and 28 days after mixing design. The results of tests show that with increasing the replacement of RAP and steel slag in RCC samples, the compressive strength is significantly reduced; Compressive strength in the sample containing 100% RAP and steel slag, is approximately one third of the compressive strength of the sample; However, this declining trend has slowed down for the tensile and flexural strengths. Also, only the sample containing 25% of RAP and steel slag has the required minimum compressive strength in accordance with the relevant standards; While 28-day tensile and flexural strength in samples containing 25%, 50% and 75% of RAP and steel slag, is higher than the allowable values ​​in accordance with the relevant standards. The results of toughness test showed that with increasing RAP and steel slag, the maximum load was decreased; However, energy absorption capacity and consequently toughness increased, due to the increase in flexibility of RCC mixtures.

کلیدواژه‌ها [English]

  • Roller Compacted Concrete
  • Reclaimed Asphalt Pavement
  • Steel Slag
  • Concrete Pavement

مراجع

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  • تاریخ دریافت: 25 فروردین 1401
  • تاریخ بازنگری: 16 خرداد 1401
  • تاریخ پذیرش: 14 تیر 1401

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