کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1457223 989247 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Monitoring of cracking and healing in an ultra high performance cementitious material using the time reversal technique
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
Monitoring of cracking and healing in an ultra high performance cementitious material using the time reversal technique
چکیده انگلیسی

A non-destructive testing technique based on the time reversal principle is applied to cementitious materials. Preliminary results are presented showing the reversibility of wave propagation and that focusing by time reversal is feasible in cementitious materials. Then, the technique is implemented on a mechanical test in order to monitor the cracking process of a concrete specimen loaded under three point bending. The acoustic mirror permits qualitative monitoring of the propagation of a crack by analyzing the focusing of a reference signal on a sensor placed near the expected crack path. A decrease of energy and of amplitude of the focused signal is observed upon cracking. Then, the specimen made of a material with high capabilities of self healing, is immersed in water, and healing processes are monitored. The results show a recovery of signal focusing upon healing. Comparisons with mechanical test data indicate that the method is sensitive to the variation of stiffness of the structure due to crack propagation and crack healing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 39, Issue 4, April 2009, Pages 296–302
نویسندگان
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