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دراسة تجريبية على الخرسانة المنتجة من ركام معاد تدويره
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تعتبر الخرسانة من أكثر مواد البناء استخداماً للمميزات الكثيرة التي تتمتع بها، الأمر الذي يؤدي بالنتيجة إلى كميات كبيرة من النفايات الخرسانية الناتجة عن الهدم كمحاولة لإنتاج خرسانة صديقة للبيئة، تم في هذا البحث استخدام النسب 0%، 50%، 75%، 100% من الركام الخشن المعاد تدويره كبديل عن الركام الخشن الطبيعي في الخلطة الخرسانية، و تمت دراسة قابلية التشغيل و كذلك الوزن الحجمي للخرسانة في الحالة الرطبة و الجافة، كما تمت دراسة سلوك الخرسانة المنتجة من الركام المعاد تدويره من خلال تعيين مقاومة الضغط عند 7، 28، 56 يوم، و كذلك مقاومة الشد بالفلق و معامل المرونة في اليوم 28. بيّن هذا البحث أن استخدام الركام المعاد تدويره يؤدي إلى انخفاض الخصائص الميكانيكية للخلطة الخرسانية عندما تزداد نسبة الركام المعاد تدويره عن 50% حيث من أجل نسبة 100% من الركام المعاد تدويره انخفضت مقاومات الضغط، الشد بالفلق و معامل المرونة بمقدار 14%، 22%، 25% على الترتيب بالمقارنة مع الخرسانة التقليدية بركام طبيعي و بالتالي من الممكن استخدام الخرسانة المنتجة من ركام معاد تدويره في الحصول على العناصر الانشائية غير الحاملة.
Concrete considers as the most popular building material because of the many advantages that it has. This come up with a huge amount of concrete waste. As a way to produce a concrete which is friend to environment, four percentages 0%, 50%, 75%, 100% of coarse recycled aggregate as replacement of natural coarse aggregate in concrete mix are used in this research. The work ability and wet and dry density are presented in this study. The compressive strength at age of 7, 28, 56 days are estimated, also splitting tensile strength and modulus of elasticity are founded at 28 day. The study shows that when The percentage of recycled aggregate exceeds 50% in concrete mix the mechanical properties reduce. When 100% of recycled aggregate is used the compressive strength, splitting tensile strength and elastic modulus decrease by 14%, 22%, 25% respectively, so it is possible to use recycled aggregate concrete in production of non-structural elements.
References used
PAUL, S. Mechanical Behaviour And Durability Performance Of Concrete Containing Recycled Concrete Aggregate. Master’s Thesis .The Department Of Civil Engineering Of The University Of Stellenbosch, Stellenbosch, South Africa, 2011, 128
MURALI, G.; VIVEK, C.M.; RAJAN, G.; JANANI, N. Experimental Study On Recycled Aggregate Concrete. International Journal of Engineering Research and Applications, Vol 2, 2012, 407 -410
MALEŠEV, M.; RADONJANIN, V., MARINKOVIĆ, S. Recycled Concrete as Aggregate for Structural Concrete Production. Sustainability, Vol. 2, 2010, 1204-1225
JANKOVIĆ, K.; NIKOLIĆ, D.; BOJOVIĆ, D.; LONČAR, L.; ROMAKOV, Z. The Estimation Of Compressive Strength Of Normal And Recycled Aggregate Concrete. Architecture and Civil Engineering, Vol. 9, No 3, 2011, 419 – 431
TAM, V.W; GAO, X. F.; TAM, C.M. Microstructural analysis of recycled aggregate concrete produced from two-stage mixing approach. Cement and Concrete Research, Vol 35, 2005, 1195–1203
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Featuring a self-compacting concrete (SCC) high capacity to fill the mold and
passing ability through barriers under the influence of self-weight without vibration,
thereby reducing the required labour and reduces the noise associated with vibratio
n.
Modern applications focused on improving the specifications of high performance,
resistance and speed of construction. The research presents an experimental study for an
(SCC) mix produced from local materials, including the necessary tests on the proposed
concrete mix, which approved in the global codes. These experiments determine the basic
characteristics of (SCC) in fresh case were also identified pressure resistance of (SCC) and
determine the value of the modulus of elasticity (E) and the behavior curvatures. All mixes
have been achieved global standards and conditions, and the required experiments were
done in the laboratory of civil engineering faculty at Tishreen University.
The accelerated structural expansion in most countries has resulted in a major problem related to providing the necessary concrete for these buildings. Besides, the buildings that have become out of service recently has posed a real problem represent
ed in demolishing them creating a large amount of hard-to-manage aggregate.
The necessity to get rid of the aggregate have opened up the possibilities for attempting to use it as a relative substitute for the natural aggregate. The research focuses on recycling these aggregate in an attempt to use them in producing concrete and other construction materials. The research deals with one of the mechanisms of benefiting from these recycled aggregate through using them in producing concrete through treating the aggregate produced from demolition, and mixing them in quantities that reflect their actual ratio. The results are of great importance economically and environmentally.
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