ارزیابی آزمایشگاهی خواص مکانیکی روسازی بتن قلیافعال، تحت حرارت بالا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته دکتری‌، گروه مهندسی عمران، واحد چالوس، دانشگاه آزاد اسلامی، چالوس، ایران

2 گروه مهندسی عمران، واحد چالوس، دانشگاه آزاد اسلامی، چالوس، ایران

3 گروه مهندسی عمران، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران

چکیده

مصرف بتن معمولی به دلیل آلودگی های محیط زیستی و دوام پایین در برابر محیط های شیمیایی خورنده همواره با چالش هایی مواجه بوده است. در این راستا بتن قلیافعال با خواص بالا و حداقل مضرات محیط زیستی نظر محققان را به خود جلب نموده است. در تحقیق آزمایشگاهی پیش رو، یک طرح اختلاط از بتن کنترل و سه طرح اختلاط از بتن قلیافعال سرباره ای حاوی 0، 4 و 8 درصد نانوسیلیس ساخته شد، طرح بهینه پس از انجام آزمون های مقاومت فشاری، مقاومت کششی و مدول الاستیسیته، از بین سه طرح از بتن قلیافعال انتخاب و با افزودن 1 و 2 درصد الیاف پلی الفین به آن، دو طرح دیگر (طرح 5 و6) ساخته شد. نمونه های بتنی در سن عمل آوری90 روزه در دمای اتاق و تحت حرارت بالا، مورد آزمون قرار گرفتند. اعمال حرارت موجب افت نتایج گردید بطوریکه، در طرح های بتن قلیافعال، بیشترین افت تحت آزمون مقاومت فشاری، مقاومت کششی و مدول الاستیسیته به ترتیب به میزان 16، 21 و 42 درصد در طرح2 بدست آمد. تصاویر الکترونی روبشی (SEM) از ریزساختار بتن در تفسیر نتایج حاصله از تمام آزمون ها در همپوشانی و هماهنگی قرار گرفت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental evaluation of mechanical properties of Active alkali concrete pavement under high temperature

نویسندگان [English]

  • Mohammadhossein Mansourghanaei 1
  • Morteza Biklaryan 2
  • Alireza Mardookhpour 3
1 Ph.D. Grad., Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran.
2 Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran
3 Department of Civil Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran.
چکیده [English]

The use of conventional concrete has always faced challenges due to environmental pollution and low durability against corrosive chemical environments. In this regard, alkaline concrete with high properties and minimal environmental damage has attracted the attention of researchers. In the present laboratory research, a mixing design of control concrete and three mixing designs of reinforced slag concrete containing 0, 4 and 8% nanosilica were constructed. Three designs were selected from reinforced concrete and by adding 1 and 2% of polyolefin fibers to it, two more designs were made (designs 5 and 6). Concrete specimens were tested at 90 days of curing at room temperature and high temperature. The application of heat caused a decrease in the results so that, in high-strength concrete designs, the highest drop under the test of compressive strength, tensile strength and modulus of elasticity was 16, 21 and 42%, respectively, in Figure 2. Scanning electron images (SEM) of concrete microstructure were interpreted in overlap and coordination in interpreting the results of all tests.

کلیدواژه‌ها [English]

  • Active Alkali Concrete
  • Compressive Strength
  • Tensile Strength
  • Modulus of Elasticity
  • High Heat

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