کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6725738 503610 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effectiveness of Impact Echo testing in detecting flaws in prestressed concrete slabs
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Effectiveness of Impact Echo testing in detecting flaws in prestressed concrete slabs
چکیده انگلیسی
This paper presents application of Impact Echo (IE) technique for evaluation of unsound concrete in the anchorage zones of a post-tensioned (PT) slab in a high rise building. The L-shaped area where the problem occurred was located at the interface of prestressed concrete beams and a depressed floor slab. Single point IE evaluation was used as the Non-Destructive Testing (NDT) evaluation method due to its portability and recent success in similar applications. Repair scheme for the affected portions was devised based on the results of IE investigations. Majority (84%) of the tested locations were classified as Good or Fair and required no further investigation/repair. The remaining 16% of the locations that were identified as Questionable or Poor by IE testing were manually investigated by field chipping. These destructive field investigations revealed that the accuracy of fault prediction by single point IE method in the current application was around 60% for the points that were classified as Questionable/Poor. Adjustment to the commonly used geometric correction factor (K) in IE testing by ±5% improved this accuracy to 81%. This finding points to the need of adopting a revised geometric correction factor in IE testing of actual structural elements under field conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 47, October 2013, Pages 753-759
نویسندگان
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