پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

مقایسه سرعت عبور امواج فراصوت در بتن قلیافعال و بتن معمولی تحت حرارت بالا براساس آنالیز XRD و SEM، جهت مصرف در روسازی

نوع مقاله : مقاله پژوهشی

نویسندگان
محمدحسین منصورقناعی 1
مرتضی بیک لریان 2
علیرضا مردوخ پور 3
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
10.22034/tri.2022.318620.2989
چکیده
یکی از معایب مصرف بتن معمولی در روسازی راه ها، مقاومت پایین آن در برابر بارهای وارده ترافیکی می باشد. اما امروزه دانشمندان با بکارگیری از مصالح نوینی مانند سرباره کوره آهنگدازی در ترکیب بتن، توانسته اند میزان مقاومت بتن را بهبود ببخشند. این مصالح دارای موادی چسباننده و پر کننده نظیر آلومینات و سیلیکات هستند که پس از فرایند واکنش شیمیایی با محلول های قلیایی، بهبود مقاومت در بتن را تضمین می کنند. هدف این پژوهش آزمایشگاهی، ساخت بتن با مقاومت بالاتر نسبت به بتن معمولی مصرفی در روسازی راه ها است، در این راستا یک طرح اختلاط از بتن معمولی با عیار سیمان450 کیلوگرم بر متر مکعب ساخته شد. یک طرح اختلاط نیز از بتن قلیافعال بر پایه سرباره کوره آهنگدازی ساخته شد تا میزان سرعت عبور پالس اولتراسنیک (UPV) بتن تحت دمای محیط و حرارت 500 درجه سلسیوس، در سن عمل آوری90 روزه مورد مقایسه و ارزیابی قرار گیرد. در ادامه آزمون های طیف سنجی پراش اشعه ایکس (XRD) و تصویر برداری توسط میکروسکوپ الکترونی روبشی (SEM) به منظور بررسی بیشتر و راستی آزمایی نتایج آزمون UPV، در سن عمل آوری90 روزه در دمای محیط و تحت حرارت 500 درجه سلسیوس بر روی نمونه های بتنی انجام گرفت. بر اساس نتایج حاصله، میزان UPV در دمای محیط، برای بتن معمولی به مقدار 5930 متر بر ثانیه و برای بتن قلیافعال به مقدار 4920 متر بر ثانیه کسب گردید که اختلاف 03/17 درصدی را دارا بود. با اعمال حرارت به نمونه های بتنی، میزان افتUPV در بتن معمولی به مقدار 26/37 درصد و در بتن قلیافعال به میزان 93/45 درصد رسید. نتایج آزمون های XRD و SEM ضمن هماهنگی با یکدیگر، در همپوشانی با نتایج حاصل از آزمون UPV قرار داشتند.
کلیدواژه‌ها
بتن قلیافعال
سرباره کوره آهنگدازی
سرعت عبور اموج فراصوت (UPV)
طیف‌سنجی پراش اشعه‌ایکس (XRD)
میکروسکوپ الکترونی روبشی (SEM)

موضوعات

عنوان مقاله English

Comparison of Ultrasonic Pulse Passage Velocity in High-Strength Concrete and Ordinary Concrete, Under High Temperature Based on XRD and SEM Analyses, for Use in Pavement

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

One of the disadvantages of using conventional concrete in road paving is its low resistance to traffic loads. But today, scientists have been able to improve the strength of concrete by using new materials such as slag in the composition of concrete. These materials contain adhesives and fillers such as aluminate and silicate, which ensure the improvement of strength in concrete after the process of chemical reaction with alkaline solutions. The purpose of this laboratory research is to make concrete with higher strength than ordinary concrete used in road pavement. In this regard, a mixing plan was made of ordinary concrete with a cement grade of 450 kg/m3. A mixing design was also made of fermented concrete based on composite kiln slag to compare and evaluate the ultrasonic pulse (UPV) rate of concrete under ambient temperature and temperature of 500 °C, at a 90-day curing age. Continuation of X-ray diffraction (XRD) spectroscopy and scanning electron microscopy (SEM) imaging tests to further evaluate and verify the UPV test results at 90 days of processing at ambient temperature and 500 °C on the sample Concrete works were carried out. Based on the results, the amount of UPV at ambient temperature was 5930 m/s for ordinary concrete and 4920 m/s for alkaline concrete, which had a difference of 17.03%. By applying heat to concrete samples, the rate of UPV drop in ordinary concrete was 37.26% and in quilted concrete was 45.93%. The results of XRD and SEM tests were in agreement with each other and overlapped with the results of UPV test.

کلیدواژه‌ها English

Active Alkali Concrete
Blast Furnace Slag
Ultrasonic Wave Passage Velocity (UPV)
X-Ray Diffraction (XRD)
Scanning Electron Microscopy (SEM)
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پژوهشنامه حمل و نقل
دوره 21، شماره 2 - شماره پیاپی 79
تابستان 1403
صفحه 205-216