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Mechanical Properties of Concrete Made with Recycled Aggregates

تغير الخواص الميكانيكية للبيتون المصنع باستخدام الحصويات البيتونية المعاد تدويرها

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 Publication date 2016
and research's language is العربية
 Created by Shamra Editor




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The large increase in the volume of demolition concrete waste and its impact on the environment has led to reconsider of using concrete demolition rubble as a partial or a whole alternative of natural aggregates to produce new concrete which has the required properties to use in engineering constructions[1]. With the possibility of improving the mechanical properties of this concrete by processing this aggregates before using it or support this concrete with fiber to improve its structural behavior. This research deals with the study of the replacement the natural aggregates used in concrete with recycled concrete aggregates resulting from the demolition rubble , according to different replacement ratiosranging between 0 % -25 % -50 % -75 % -100% and the impact on the concrete behavior with a natural aggregates and determine the optimal replacementpercentage. The results showed a relative decrease in the concrete resistance on the simple pressure , limited decrease in the volumetric mass also, and a slight adjustment to the behavior of concrete under the loading effect by increasing the replacement proportion of the natural aggregateswith recycled concrete aggregates..

References used
J.S. Ryu, “An experimental study on the effect of recycled aggregateconcrete properties, Mag. Concr. Res. 54 (1) (2002) 7 – 12
Symonds Group Ltd 46967, “Construction and demolition waste management practices, and their economic impacts”. Final Report to DGXI, European Commission, February 1996
Topcu , I.B and sengel .,"Properties of concrete produced with waste concrete aggregate" , Journal of cement and concrete Research ,34 (2004) , 1307-1312

Artificial intelligence review:
Research summary
تتناول هذه الدراسة البحثية تأثير استخدام الحصويات البيتونية المعاد تدويرها كبديل عن الحصويات الطبيعية في تصنيع البيتون، وذلك بسبب الزيادة الكبيرة في حجم نفايات الهدم وتأثيرها السلبي على البيئة. تم اختبار نسب استبدال مختلفة تتراوح بين 0% و100% لدراسة تأثيرها على الخواص الميكانيكية للبيتون. أظهرت النتائج انخفاضًا نسبيًا في مقاومة الضغط البسيط والكتلة الحجمية للبيتون مع زيادة نسبة الحصويات المعاد تدويرها. كما لوحظ تعديل طفيف في سلوك البيتون تحت تأثير التحميل. توصلت الدراسة إلى أن استخدام الحصويات المعاد تدويرها يمكن أن يكون بديلاً مقبولًا في بعض التطبيقات الهندسية، مع توصية بعدم تجاوز نسبة استبدال معينة للحفاظ على جودة البيتون.
Critical review
دراسة نقدية: تعد هذه الدراسة خطوة مهمة نحو تحقيق التنمية المستدامة في قطاع البناء والتشييد، حيث تسهم في تقليل النفايات والاستفادة من الموارد المتاحة. ومع ذلك، يمكن توجيه بعض الانتقادات البناءة لتحسين الدراسة. أولاً، كان من الممكن توسيع نطاق الاختبارات لتشمل خصائص ميكانيكية أخرى مثل مقاومة الشد والانحناء. ثانيًا، لم تتناول الدراسة تأثير العوامل البيئية المختلفة على البيتون المصنع باستخدام الحصويات المعاد تدويرها، مثل تأثير الرطوبة ودرجات الحرارة المختلفة. أخيرًا، كان من الممكن تقديم توصيات أكثر تفصيلية حول كيفية تحسين خصائص البيتون باستخدام تقنيات معالجة إضافية للحصويات المعاد تدويرها.
Questions related to the research
  1. ما هي النسب المختلفة لاستبدال الحصويات الطبيعية بالحصويات المعاد تدويرها التي تم اختبارها في الدراسة؟

    تم اختبار نسب استبدال مختلفة تتراوح بين 0% و100%.

  2. ما هو التأثير الرئيسي لاستخدام الحصويات المعاد تدويرها على مقاومة الضغط البسيط للبيتون؟

    أظهرت النتائج انخفاضًا نسبيًا في مقاومة الضغط البسيط للبيتون مع زيادة نسبة الحصويات المعاد تدويرها.

  3. ما هي التوصية الرئيسية التي قدمتها الدراسة بشأن نسبة استبدال الحصويات الطبيعية بالحصويات المعاد تدويرها؟

    توصي الدراسة بعدم تجاوز نسبة استبدال معينة للحفاظ على جودة البيتون، مع إمكانية استخدام الحصويات المعاد تدويرها بنسب لا تتجاوز 50%.

  4. ما هي العوامل التي لم تتناولها الدراسة والتي يمكن أن تؤثر على خصائص البيتون المصنع باستخدام الحصويات المعاد تدويرها؟

    لم تتناول الدراسة تأثير العوامل البيئية المختلفة مثل الرطوبة ودرجات الحرارة المختلفة على خصائص البيتون.

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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.
The recycled concrete aggregate RCA was able to take the place of the vierge & natural aggregate NA, embankments elected,to implement the base&subbase road layaers and airports in many country of the world.furthermore, there is almost consensus by a large of reshershers and scholars about the possibility of using RCA in mix cement concrete for non-structural elements .whil,the using of RCA in the hot mix asphalt HMA still under discussion and debate, due its high porosity , high water absorption, and its heterogeneity which reflected negatively on the mechanical and physical properties of the HMA This research discusses stadying the possibility of using the recycled concrete aggregates in hot mix asphalt HMA, for the implementation of the bas layer bituminous road , by the application of the marshall tests on hot mixtures asphalts have ben prepared using different ratios of recycled concrete aggregates. The results of marshall testes showed that the HMA prepared with amount of recycled concrete aggregates less than 50%,can be used to implement the base layer bituminous road,according to the general terms and specifications book for road works and bridges in the syrien arab republic.
Thepaper studies the mechanical properties ofsteel fibers reinforced lightweight concrete.This kind of concrete is produced by usingscoria aggregateswhich can be found abundantly in Syria. Thelightweight concrete mixeswere designed for three differ ent percentage of steel fibers (0, 0.5, 0.75)%. Different tests were performed to determine mechanical properties of product concrete such as compressive strength, elasticity modulus, splitting tensile strengthand flexural strengthalso; the stress–strain diagram of produced lightweight concrete was established under compression. The results showedanincrease of the compressive, splitting tensile and flexural strengths reach up 16.9%, 25.6%, and 53.6% respectivelywhen the steel fibers were used. Also the results indicated the importance of using the steel fibers to improve the performance of concrete and change its brittle behavior to ductile behavior.
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The research includes an analytical study using the finite element method for the reinforced concrete beams containing holes in the body. These tested trophies have a rectangular cross-section and without additional armament in the area of the hole, and two patterns (patterned and simple support) were studied. As for the holes, they are rectangular in shape with variable dimensions, where prizes with one hole and prizes with two holes were chosen.
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