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Register a new userدراسة عملية لتأثير خصائص مواد و سطوح الترميم على إجهاد الالتصاق
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Tishreen University ورقة بحثية
Publication date
2016
fields
Management and Construction
and research's language is
العربية
Created by
Shamra Editor
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يُعتبر ترميم العناصر الإنشائية من الأعمال الأكثر حضوراً في عالم البناء، يعود ذلك لقصور في التنفيذ أحياناً، و للظروف القاسية التي تتعرض لها المنشآت الهندسية أحياناً أخرى. تُستخدم في عمليات الترميم و التدعيم مواد خاصة يجب أن تتصف بسرعة التصلب و المقاومة و الديمومة العاليتين و جودة الالتصاق مع السطوح المعدة للترميم. قمنا في هذا البحث بدراسة تأثير طبيعة مادة الترميم و السطح المقابل على نجاح الترميم و الذي يُعتبر إجهاد الالتصاق من أهم مؤشراته. اعتمدنا في قياس إجهاد الالتصاق على تقنية نزع مادة الترميم عن سطح محدد بتطبيق إجهاد شد مباشر عليه لاقتلاعه عن السطح (Pull Off Adhesion Testing – ASTM D4541). تُظهر النتائج التي حصلنا عليها الأهمية القصوى لخصائص مادة الترميم و طبيعة السطح على إجهاد الالتصاق المقاس، إذ تراوحت قيم إجهاد الالتصاق على السطوح بين 0.2 و 3Mpa. و تأثرت قيم الإجهاد بعاملين رئيسيين هما مقاومة مادة الترميم المطبقة و قوامها، مع الإشارة إلى أن القوام يجب أن يترافق مع قيم جيدة للمقاومة الميكانيكية و هو ما يستدعي العمل على تحسين القوام من خلال استخدام بعض الملدنات عالية الأداء، أو الإضافات البوليميرية الخاصة كمطاط الستيرين بوتادين (styrene-butadiene rubber SBR).
No English abstract
References used
ABU-TAIR, A.I. et coll. (2000) A new method for evaluating the surface roughness of concrete cut for repair or strengthening , Construction and building materials, vol. 14, no 3, pp. 171-176
ASTM C1583 (2004) Standard Test Method for Tensile Strength of Concrete Surfaces and the Bond Strength or Tensile Strength of Concrete Repair and Overlay Materials by Direct Tension (Pull-out Method) , Annual Book of ASTM Standards, Concrete and aggregates, volume 04.02
AUSTIN, S. et coll. (1995) Tensile bond testing of concrete repairs , Materials and Structures, vol. 28, no 179, pp. 249-259
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