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ارزیابی تأثیر دما و الیاف بر خواص مکانیکی بتن خودمتراکم سبک | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 22، دوره 53، شماره 9، آذر 1400، صفحه 4007-4028 اصل مقاله (2.06 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.18185.6794 | ||
| نویسندگان | ||
| موسی مظلوم* 1؛ سجاد لطفی آهنگرکلایی2 | ||
| 1تهران - لویزان - دانشگاه شهید رجایی - دانشکده عمران | ||
| 2کارشناس ارشد مهندسی سازه، دانشکده مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران | ||
| چکیده | ||
| مزایای بتن خودمتراکم سبک باعث استفاده روزافزون آن در صنعت ساخت و ساز شده است. استفاده از الیاف مختلف در این نوع بتن سبب مشکلاتی نظیر کاهش کارایی و حساسیت به دما می‌شود که نوع و نحوه استفاده از الیاف را به چالش می‌کشد. از این رو در این تحقیق، اثرات دما و الیاف شیشه و بازالت بر روی خصوصیات بتن خودمتراکم سبک مورد بررسی قرار گرفته است. در همین راستا 12 طرح اختلاط از این نوع بتن شامل طرحهای اختلاط تکی حاوی 0/25%،0/5 %، 0/75%و 1% حجمی هر کدام از الیاف‌ها و نمونه‌های ترکیبی شامل 0/25% الیاف بازالت و 0/75% الیاف شیشه، 0/5% الیاف بازالت به همراه0/5% الیاف شیشه، و 0/75% الیاف بازالت با0/25% الیاف شیشه ساخته شده است. خواص خودمتراکمی در این بتن توسط آزمایش‌های جریان اسلامپ، 500T، قیفV و حلقه J سنجیده شده است. آزمایش‌های مقاومت فشاری، کششی و خمشی جهت تعیین ویژگی‌های مکانیکی بتن در دمای 20 درجه سلسیوس، همچنین دماهای 100 و 300 درجه سلسیوس انجام گرفتند. در نهایت نتایج آزمایش‌های بتن تازه نشان دادند که بتن خودمتراکم سبک حاضر قابلیت‌های گذرندگی، پرشوندگی و مقاومت در برابر جداشدگی را پوشش داده‌اند. همچنین مشخص شد افزایش الیاف موجب کاهش مقاومت فشاری و افزایش مقاومت‌های کششی، خمشی و همچنین انرژی شکست می‌شود. علاوه بر این استفاده از الیاف به صورت ترکیبی در مقایسه با الیاف به صورت تکی خواص مکانیکی بتن را بهبود بیشتری بخشیده‌اند. بهترین طرح اختلاط حاوی ترکیبی از 0/75% الیاف شیشه و 0/25% الیاف بازالت بوده است که خواص قابل قبولی از بتن تازه و سخت شده و همچنین مقاومت در دماهای بالا را ارائه کرده است. | ||
| کلیدواژه‌ها | ||
| بتن خودمتراکم سبک؛ بتن الیافی؛ الیاف شیشه؛ الیاف بازالت؛ دمای بالا | ||
| موضوعات | ||
| تکنولوژی بتن؛ فیبرهای پلیمری تقویت‌شده | ||
| عنوان مقاله [English] | ||
| Evaluating the influence of temperature and fiber type on the mechanical properties of self-compacting lightweight concrete | ||
| نویسندگان [English] | ||
| Moosa Mazloom1؛ Sajjad Lotfi Ahangar Kolaee2 | ||
| 2M.Sc., Civil Engineering Department, Shahid Rajaee Teacher Training University, Tehran, Iran | ||
| چکیده [English] | ||
| The advantages of self-compacting lightweight concrete have led to its increasing use in the construction industry. The use of different fibers in this type of concrete causes problems such as reduced flowability and sensitivity to temperature, which challenges the type and method of using fibers. In the present study, the effects of glass and basalt fibers (GF and BF) and temperature on the properties of self-compacting lightweight concrete (SCLC) have been investigated. For this aim, the fresh and hardened properties of 12 SCLC mixes have been investigated that contained monotype and hybrid fibers. The self-compacting properties of SCLC were assessed using slump flow, T500, V-funnel, and J-ring. After 28 days of curing, the compressive, splitting tensile and flexural strengths tests were performed to characterize the mechanical properties of SCLC at room temperature of 20 °C and high temperatures of 100 and 300 °C. The test results of fresh concrete showed that all the mixes could be defined as SCLC with good flowability, viscosity, and passing ability. Hardened test results indicated that the addition of the fibers reduced the compressive strength and increased the tensile strength, flexural strength, and fracture energy. Moreover, compared to monotype fibers, the hybrid ones effectively enhanced the mechanical behaviors of SCLC. | ||
| کلیدواژه‌ها [English] | ||
| Self-compacting lightweight concrete, Fiber-reinforced concrete, Glass fiber, Basalt fiber, High temperature | ||
| مراجع | ||
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