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Tishreen University ورقة بحثية
Publication date
2013
fields
Management and Construction
and research's language is
العربية
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بدأ استخدام البيتون ذاتي التوضع وفق التسمية الفرنسية (Béton Auto-Plaçant BAP)، أو ذاتي الارتصاص وفق التسمية الإنكليزية (Self-Compacting Concrete SCC) في اليابان منذ العام 1980 بهدف تحسين خواص البيتون و رفع مستوى الأداء في قطاع البناء من خلال الصب المثالي و إنتاج بيتون بمواصفات أهمها عدم الحاجة إلى الرج، و القدرة على الملء المثالي لقالب الصب كثيف التسليح من خلال اكتسابه للميوعة العالية التي تساعده على الجريان تحت تأثير وزنه الذاتي، و اللزوجة العالية التي تحد من ظاهرة انفصال الحصويات. مع المحافظة على ظروف عمل بيئية ملائمة بالحد الأدنى من الضجيج [1]. تكمن الصعوبة في الوصول إلى تصميم جيد لخلطات البيتون ذاتي التوضع من خلال ضرورة تحقيق هذين الشرطين المتناقضين، الأمر الذي يحتاج الى خبرة عالية ، و ذلك لعدم وجود منهجية واضحة للتصميم، و الاعتماد على التجريب بشكل رئيسي. تم في هذا البحث اقتراح منهجية جديدة قابلة للتطبيق لتصميم خلطات البيتون ذاتي التوضع و تحسين مواصفاتها، و ذلك بخطوات تعتمد على التحسين المتتالي لمواصفات البيتون المصمم، مع تقليل الاعتماد على الحكم الذاتي و الخبرة الشخصية. و لمعرفة مدى كفاءة المنهجية المقترحة، تم التحقق منها تجريبياً على خلطات مصممة من مواد محلية، أعطت بعد اعتماد المنهجية المقترحة بيتوناً ذاتي التوضع يحقق الاشتراطات المطلوبة، كما يحقق المواصفات الميكانيكية اللازمة لاستخدامه في صب العناصر الإنشائية.
No English abstract
References used
ASSIE S., Durabilité des Bétons Auto-Plaçants, thèse de doctorat de l’Institut National des Sciences Appliquées de Toulouse, France, octobre 2004
MALHOTRA, V. M. Matériaux Complémentaires en cimentation pour le béton, Ottawa, Minister of Supply and Services, Canada, 1989, 471
OKAMURA, H. et al. Self-compacting high performance concrete, Proceeding of the Fifth EA SEC, vol.3, 1995, pp.2381-2388
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