بررسی آزمایشگاهی تاثیر دمای بالا بر سرعت عبور امواج اولتراسونیک (UPV) در بتن سرباره قلیافعال مصرفی در روسازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری عمران سازه، 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

در این پژوهش آزمایشگاهی به بررسی سرعت عبور امواج اولتراسونیک (UPV) در بتن سرباره قلیافعال سرباره ای مصرفی در روسازی، تحت حرارت بالا در سن عمل آوری 90 روزه پرداخته شد، در ادامه با انجام آزمون تصویر برداری میکروسکوپ الکترونیک روبشی (SEM) در بتن، به آنالیز و بررسی هم پوشانی نتایج پرداخته شد. در این راستا یک طرح اختلاط از بتن کنترل و سه طرح اختلاط از بتن سرباره قلیافعال سرباره ای حاوی 0، 4 و 8 درصد نانوسیلیس ساخته شد. سپس طرح بهینه حاصل از نتایج آزمون ها، از بین سه طرح بتن سرباره قلیافعال انتخاب گردید و به میزان 1 و 2 درصد الیاف پلی الفین به آن اضافه گردید و دو طرح دیگر از بتن سرباره قلیافعال ساخته شد، نمونه های جدید تحت دمای اتاق و حرارت بالا مورد آزمون UPV و SEM و آنالیز قرار گرفتند. نتایج حاصله حاکی از بهبود 11 درصدی (طرح3 نسبت به طرح2) سرعت عبور امواج اولتراسونیک با افزودن نانوسیلیس به بتن سرباره قلیافعال در دمای اتاق بود، اما حضور الیاف پلی الفین موجب افت UPV به میزان 12 درصدی (طرح6 نسبت به طرح3) گردید. اعمال حرارت بالا در بتن اثرات مضری در نتایج آزمون UPV و SEM به همراه داشت، بطوریکه کمترین و بیشترین میزان افت در سرعت عبور امواج اولتراسونیک در نمونه های بتنی به مقدار 37 و 46 درصد به ترتیب متعلق به طرح1 (حاوی بتن معمولی) و طرح2 (بتن سرباره قلیافعال فاقد نانوسیلیس) بدست آمد. بررسی های ریزساختاری از SEM، نشان از هماهنگی و هم پوشانی نتایج حاصله در این پژوهش داشت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental study of the effect of high temperature on the passage speed of Ultrasonic Pulse Velocity (UPV) in alkaline slag concrete used in pavement

نویسندگان [English]

  • mohammadhossein mansourghanaei 1
  • Morteza Biklaryan 2
  • Alireza Mardookhpour 3
1 Ph.D Student in Civil Engineering, 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]

In this laboratory study, Ultrasonic Pulse Velocity (UPV) was investigated in high-temperature slag slag concrete used in pavement at high temperature at 90-day curing age, followed by scanning electron microscopy (SEM) imaging test in concrete. The overlap of the results was analyzed and investigated. In this regard, one mixing design was made of control concrete and three mixing designs were made of low-slag slag concrete containing 0, 4 and 8% nanosilica. Then, the optimal design obtained from the test results was selected from three designs of alkaline slag concrete and 1 and 2% of polyolefin fibers were added to it, and two other designs were made of alkaline slag concrete, new samples under room temperature and High temperatures were subjected to UPV, SEM and analysis. The results showed an 11% improvement (Scheme 3 compared to Scheme 2) in the passage of ultrasonic waves by adding nanosilica to alkaline slag concrete at room temperature, but the presence of polyolefin fibers reduced the UPV by 12% (Scheme 6 compared to Scheme 3). High heat application in concrete had harmful effects on the results of UPV and SEM test, so that the lowest and highest rate of decrease in ultrasonic wave velocity in concrete samples of 37 and 46%, respectively, belong to plan 1 (containing ordinary concrete) and plan 2. (Alkaline slag concrete without nanosilica) was obtained. Microstructural studies of SEM showed the coordination and overlap of the results obtained in this study.

کلیدواژه‌ها [English]

  • Active alkali slag concrete
  • Nanosilica
  • Ultrasonic wave velocity (UPV)
  • Scanning electron microscope (SEM)
  • High temperature

مراجع

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سابقه مقاله

  • تاریخ دریافت: 15 آبان 1400
  • تاریخ بازنگری: 26 آذر 1400
  • تاریخ پذیرش: 15 دی 1400

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