تاثیر سرباره‌ی مس بر روی مشخصات مکانیکی و انرژی شکست کامپوزیت سیمانی الیافی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 تهران - لویزان - دانشگاه شهید رجایی - دانشکده عمران

2 کارشناس ارشد سازه، دانشکده مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران

چکیده

یکی از مهم‌ترین خصوصیت‌های منفی بتن، ضعف آن در کشش و ترک‌خوردگی آن است. به کار بردن الیاف در بتن تا حد زیادی این ضعف را جبران می‌کند. کامپوزیت‌­های سیمانی الیافی نوعی از بتن‌های الیافی می‌‌باشند که در آن­‌ها به جای استفاده از سنگدانه­‌های درشت، از ریز‌دانه استفاده می‌­شود. البته مقدار عیار سیمان زیاد آن­‌ها از نظر زیست‌‌محیطی مشکل‌‌ساز است که با استفاده از مواد جایگزین سیمان مختلف، تا حدی این مشکل بر‌طرف می‌‌شود. در این تحقیق تاثیر سرباره مس بر خواص مکانیکی و انرژی شکست کامپوزیت سیمانی مسلح‌‌‌شده با الیاف پلی‌پروپیلن بررسی شده ­است. در واقع سرباره کوره‌ مس و میکروسیلیس جایگزین بخشی از سیمان گردیدند و الیاف پلی‌پروپیلن به خمیر سیمان اضافه شد. به این منظور یک طرح مخلوط شاهد فاقد میکروسیلیس و سرباره مس، 4 طرح حاوی 5% ، 7% ، 10% و 15%  میکروسیلیس، و 4 طرح دارای 5% ، 10% ، 20% و 30% سرباره مس ساخته شدند. در نهایت مشخص شد که در نمونه‌‌‌های دارای میکروسیلیس، آن‌هایی که دارای 15% از این ماده بودند، بیشترین انرژی شکست و مقاومت‌‌های فشاری، کششی و خمشی را داشتند. در مخلوط‌‌‌های حاوی سرباره مس، نمونه‌‎‌های دارای 10% و 20% سرباره دارای بیشینه پارامترهای فوق بودند. لازم به ذکر است که چندین نمونه‌ ترکیبی که شامل میکروسیلیس و سرباره مس به صورت هم‌زمان بودند، هم ساخته شدند. با مقایسه نتایج همه طرح‌ مخلوط‌های ذکر شده، مشخص شد که بهترین طرح مربوط به نمونه‌های ترکیبی حاوی 15% سرباره مس به همراه 15% میکروسیلیس است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of copper slag on the mechanical properties and fracture energy of fiber reinforced cementitious composite

نویسندگان [English]

  • Moosa Mazloom 1
  • Mohammad Akbari Jamkarani 2
2 Master of Science in Structural Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
چکیده [English]

One of the most important weakness points of concrete is its drawback in tension and cracking. The use of fibers in concrete greatly reduces this disadvantage. Fiber-reinforced cementitious composite (FRCC) is a type of fiber-reinforced concrete (FRC) that does not contain coarse aggregate and only has fine aggregate. In fact, the high level of cement in FRCC is a problem for the environment. This problem can be solved by using different cement replacement materials as a part of cement. In this study, the effect of copper slag on the mechanical properties and fracture energy of fiber-reinforced cementitious composite (FRCC) containing polypropylene fiber is investigated.  Silica fume and copper slag were replaced as a part of cement. For this purpose, a control mix without silica fume and copper slag, 4 mixes containing 5%, 7%, 10% and 15% silica fume, and 4 mixtures with 5%, 10%, 20% and 30% copper slag was casted. In specimens containing silica fume, the ones with 15% of it had the highest quantity of fracture energy, compressive, tensile, and flexural strengths. Among the samples having copper slag, the ones containing 10% and 20% of it had the highest values above. It is worth noting that some binary mixtures containing both copper slag and silica fume were prepared too. Comparing the results of all the mentioned mixtures, it is concluded that the best results belong to the binary mixture containing both 15 % copper slag and 15 % silica fume.

کلیدواژه‌ها [English]

  • Concrete
  • Fiber-reinforced concrete
  • Cementitious composite
  • Silica fume
  • Polypropylene

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 6
شهریور 1400
صفحه 2625-2638

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