توسعۀ یک روش تحلیلی برای بهینه‌سازی طرح اختلاط بتن خود‌تراکم با مقاومت بالای حاوی خاکستر بادی

نوع مقاله : پژوهشی

نویسندگان

• حسین احمدوند ¹
• علیرضا حبیبی ²

¹ دانشگاه کردستان

² دانشگاه شاهد

10.22067/civil.v31i2.57793

چکیده

بتن خودتراکم از بتن‌های نوین پر‌کاربرد در دو دهه اخیر می‌باشد. هدف از پژوهش حاضر، ارائه روشی جدید برای ارائه نسبتهای بهینه و مناسب مصالح مصرفی بتن خودتراکم می‌باشد، بطوریکه ضمن حداقل نمودن هزینه ساخت یک متر‌‌مکعب بتن، مقاومت فشاری حداکثر نیز حاصل گردد. روش پیشنهادی یک روش تحلیلی می‌باشد. در این روش با استفاده از مفاهیم بهینه‌سازی نظیر تابع لاگرانژین و شرایط کان – تاکر و معرفی رابطه خاصی برای مقاومت فشاری بتن، بدون نیاز به محاسبات رایانه‌ای و براساس یک روش کاملا تحلیلی نسبتهای بهینه‌ای برای طرح اختلاط بتن ارائه می‌گردد. روش پیشنهادی یک روش عمومی می‌باشد و برای انواع بتن کاربرد دارد، ولیکن به منظور معرفی آن، برای بتن خودتراکم با مقاومت بالای حاوی خاکستر بادی مورد استفاده قرار گرفته است. بدین منظور در ابتدا مدل بهینه‌‌سازی طرح اختلاط بتن که تاثیر نتایج آزمایشگاهی در آن لحاظ گردیده است توسعه داده می‌شود. سپس با استفاده از یک آلگوریتم بهینه‌سازی تحلیلی، طرح اختلاط بهینه بتن با مقاومت مورد نظر بدست می‌آید. نتیجه بهینه‌سازی مشخص نمود که با استفاده از روش پیشنهادی می‌توان نسبتهای بهینه‌ای برای طرح اختلاط بتن‌های خودتراکم با مقاومت‌ بالا ارائه نمود به نحوی که با حداقل مقادیر آب و مواد سیمانی تولید گردیده و هزینه تولید بتن نیز کمترین مقدار را داشته باشد.

کلیدواژه‌ها

• طرح اختلاط
• بتن خودتراکم
• بهینه‌سازی، هزینه
• مقاومت فشاری

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عنوان مقاله [English]

Development of an Analytical Method for Optimization of High Strength Self-Compacting Concrete Mix Design Containing Fly Ash

نویسندگان [English]

• Hosein Ahmadvand ¹
• AliReza Habibi ²

¹ University of Kurdistan

² Shahed University

چکیده [English]

self-compacting concrete is one of the most widely used concrete in the past two decades. The objective of present study is to introduce a new method for high strength self-compacting concrete mix design to both achieving maximum compressive strength and minimizing the cost of concrete. The proposed method is an analytical method. In this method, using optimization concepts such as Lagrangian function and Kuhn–Tucker conditions, and introducing a specific relationship to the compressive strength of concrete, without the need for computer computations, and based on a completely analytical method, provides optimal concrete mix design. The proposed method is a general approach and is applicable to all types of concrete. Here, for the purpose of introducing, the method used to high strength self-compacting concrete containing fly ash. An optimization model of the concrete mix design is first developed accounting for effects of experimental results. Then, using an optimization algorithm, optimal concrete mix design is obtained for the concrete with the strength under consideration. Results showed that the proposed method can provide optimal mix design of high-strength self-compacting concrete while water and cement amount are the minimum amounts required for self-compacting concrete.

کلیدواژه‌ها [English]

• Mix Design
• Self- Compacting Concrete
• Optimization
• Cost
• Compressive Strength

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