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The Effect of Changing Aggregate's Size on its Mechanical & Physical Properties and the Possibility of Using it in Base &Sub base Road Layers

تأثير تغير حجوم الحصويات البيتونية المدورة RCA على خواصها الفيزيائية و الميكانكية و امكانية استخدامها في انشاء طبقات الأساس و ما تحت الأساس الطرقي

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 Publication date 2015
and research's language is العربية
 Created by Shamra Editor




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The recycling of debris, is considered as one of the most important resources for constructing base &subbase road layers in many countries. There are two problems for RCA: first, the considerable size it takes up when collected and second, its low technical properties. The second problem appears in countries which don't have natural quarries and they have to use RCA in certain fields (concrete mixes, asphalt mixes, granular road layers). This research discuses preparing RCA aggregates, by recycling the concrete waste, which comes from Al-Sallima landfill, near to Damascus city. Then many tests are carried out to study the effect of changing the aggregate's size on their mechanical & physical properties, and also to study the possibility of using these aggregates in constructing base &subbase road layers. As a result, it has been found that we can use RCA for constructing unbound base &subbase road layers, and the mechanical & physical properties of these RCA get better when the aggregate's size gets smaller, except in Proctor test. In this test, Proctor density and optimum moisture content get better when aggregate's size gets bigger.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة تأثير تغير حجوم الحصويات البيتونية المدورة (RCA) على خواصها الفيزيائية والميكانيكية وإمكانية استخدامها في إنشاء طبقات الأساس وما تحت الأساس الطرقي. تعتبر عملية تدوير نفايات الهدم والبناء البيتونية من أهم مصادر الحصويات في العديد من دول العالم، ولكنها تعاني من خواص فيزيائية وميكانيكية أدنى مقارنة بالحصويات البكر. تم جمع الركام البيتوني من مكب السليمة قرب دمشق، ثم تم تحضيره وإخضاعه للاختبارات المناسبة. أظهرت النتائج أن الحصويات البيتونية المدورة يمكن استخدامها في إنشاء طبقات الأساس وما تحت الأساس الطرقي، حيث أظهرت زيادة في مقاومة الاهتراء مع تقليل خشونة الحبيبات، بينما أظهرت نتائج اختبار بروكتور زيادة في الكثافة الجافة العظمى وانخفاض الرطوبة المثلى مع الخلطات الأكثر خشونة. كما بينت الدراسة أن الحصويات البيتونية المدورة تحقق متطلبات الاستخدام في طبقات الأساس وما تحت الأساس الطرقي، مع وجود بعض التفاوت في الخواص الفيزيائية والميكانيكية بين العينات المختلفة.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال تدوير نفايات الهدم والبناء البيتونية واستخدامها في إنشاء طبقات الأساس وما تحت الأساس الطرقي. ومع ذلك، يمكن تقديم بعض الملاحظات النقدية لتحسين البحث. أولاً، يجب توسيع نطاق العينات المستخدمة لتشمل مناطق جغرافية مختلفة لضمان تعميم النتائج. ثانياً، يمكن تحسين منهجية الاختبارات لتشمل تحليلًا أعمق للخواص الكيميائية للحصويات المدورة. ثالثاً، يجب تقديم تحليل اقتصادي مفصل لتوضيح الجدوى الاقتصادية لاستخدام الحصويات البيتونية المدورة مقارنة بالحصويات البكر. وأخيراً، يمكن تعزيز الدراسة بمزيد من البيانات الميدانية لتأكيد النتائج المخبرية.
Questions related to the research
  1. ما هي أهمية تدوير نفايات الهدم والبناء البيتونية؟

    تعتبر عملية تدوير نفايات الهدم والبناء البيتونية مهمة لأنها توفر الموارد الطبيعية وتحافظ على البيئة من خلال تقليل مساحات مكبات النفايات، بالإضافة إلى تحقيق وفر اقتصادي.

  2. ما هي الخواص الفيزيائية والميكانيكية التي تم اختبارها في الحصويات البيتونية المدورة؟

    تم اختبار الأوزان النوعية، التشرب بالماء، كثافة بروكتور، مقاومة الاهتراء، المكافئ الرملي، وحدود اتربرغ في الحصويات البيتونية المدورة.

  3. ما هي النتائج الرئيسية لاختبارات بروكتور المعدل للحصويات البيتونية المدورة؟

    أظهرت نتائج اختبارات بروكتور المعدل زيادة في الكثافة الجافة العظمى وانخفاض الرطوبة المثلى مع الخلطات الأكثر خشونة للحصويات البيتونية المدورة.

  4. هل يمكن استخدام الحصويات البيتونية المدورة في إنشاء طبقات الأساس وما تحت الأساس الطرقي؟

    نعم، أظهرت الدراسة أن الحصويات البيتونية المدورة تحقق متطلبات الاستخدام في طبقات الأساس وما تحت الأساس الطرقي، مع تحسينات في مقاومة الاهتراء والكثافة الجافة العظمى.


References used
Fderal Higway Administration FHWA : Recycled Materials Policy Administrator'smessage.2002
O'MAHONY, M.M. Recycled Of Materials In Civil Engineering.A Thesis Submitted To The University Of Oxford For The Degree Of Doctor Of Philosophy New College Trinity Term 1990
MALESEV.M.;RADONJANIN.V.;MARINKOVIC.S., Recycled Concrete as Aggregate for Structural Concrete Production . Sustainability 2010
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