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Structural Evaluation of Cold Recycling Reclaimed Asphalt Pavement (RAP) Blends
تقييم إنشائي لخلطات التبليط الإسفلتي المستصلح المدور باردا

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Abstract

The technique of cold recycling of asphalt pavement materials for road construction is widely used in the world. Different types of locally available stabilizing additives and/or agents were used to find the most suitable one from the point of view of strength, economy and environment. Cubic molds of (10) cm is used in the laboratory to prepare samples of the stabilized rap materials. The effect of curing mode (effect of water absorption) was studied from strength point of view. Increasing bricks sand in the stabilized RAP materials increase the compression strength because of filling the spaces. A brick sand increasing reduces the absorption in case of cement stabilizing while with lime increases the absorption. Dynamic modulus of elasticity decreases with bricks sand increasing. Cement ratio more than 5% alone or more than 3% with lime is recommended to use, lime stabilizing ratio not exceed 10%.

إن تقنية إعادة تدوير التبليط الإسفلتي بالأسلوب البارد في إنشاء الطرق واسعة الاستخدام عالميا ويعتبر التبليط الإسفلتي المدور أكثر المواد المدورة استخداما في العالم.استخدمت مواد تثبيت ومواد مضافة مختلفة لإيجاد الملائم منها من وجهة النظر الإنشائية والاقتصادية والبيئية. قوالب مكعبه بابعاد 10 سم استعملت, و تم الآخذ بنظر الاعتبار طريقه الانضاج ( تأثير امتصاص الماء) بالهواء او بالماء. ان أضافه رمل الطابوق المكسر عند تثبيت ماده التبليط المدورة بالاسمنت يزيد من مقاومة الكسر للنماذج على العكس من النوره كذالك زيادة رمل الطابوق فيمواد الطرق المدورة والمثبتة يزيد من مقاومه الانضغاط بسبب ملئ الفراغات كما تبين ان زيادة رمل الطابوق يقلل من الامتصاص في حاله التثبيت بالسمنت بينما يزيد من الامتصاص في حاله النوره. معامل المرونه الحركي يقل بزيادة رمل الطابوق. نسبة السمنت الموصى باستعمالها اعلى من 5% ومع النوره اعلى من 3%,نسبة النوره المثبتة لاتتجاوز 10%.


Article
STUDY OF USING THE CRUSHED CLAY BRICKS WITH NATURAL AGGREGATE AS UNBOUND SUB BASE PAVEMENT LAYER IN SEGREGATED FORM

Authors: Ali Abdulla Abed --- Zaid Abdul Zahra Mahdi
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2017 Volume: 10 Issue: 4 Pages: 496-504
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

Construction and demolition of buildings and structures are producing excess or waste material which is including concrete, brick, steel, etc. Conservation and reuse of resources is a necessity in achieving sustainability across the globe, crushed brick could be safely added to crush rock blends in pavement sub-base applications with percent up to 25%. The experimental work was consisted of two groups of samples depending on percent volume of each material, each group samples have 6 different layering blends patterns prepared by spreading the pure materials in layers (segregated form) of Crushed Bricks Sand (CBS) and Natural Aggregate (NA), in addition to the two control samples and then experimentally tested to compare with the requirements of Iraqi specification for roads and bridges. The experimental work was consisted of Atterberg limits, sieve analysis, moisture-density relationship and California Bearing Ratio (CBR) tests. The results show that using of the crushed bricks as sand with natural aggregate as unbound subbase in segregated form is feasible and agreed with the Iraqi specification requirements because the CBR of CBS was improved when blended with the NA at all the patterns, the best pattern is that which containing three layers NA and two CBS (60% NA and 40% CBS by volume) and the NA was at the top, then CBS in alternated sequence that improves the CBR value to 1.6 times compared with NA control or 8 times of CBS control because the sporadic distribution reduces the effect of the low bearing material, in another words; collect the layers of the same material doesn't give best improvement.

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