Betondaki boşlukların darbe-eko ve ultrasonik-eko yöntemleri ile görüntülenmesi

Sena TAYFUR, Ninel ALVER
619 89

Öz


Darbe-eko (Impact-echo, IE) ve ultrasonik-eko (Ultrasonic-echo, UE) betondaki boşlukların belirlenmesinde yaygın olarak kullanılan elastik dalga yöntemlerindendir ve bu alanda başarılı uygulamaları mevcuttur. Ancak çoğu zaman bu yöntemlerden elde edilen sonuçların yorumlanmasında çeşitli zorluklarla karşılaşılması sebebiyle araştırmacılar görüntüleme algoritmalarını geliştirmeye çalışmaktadırlar. Bu çalışmada beton bloklarda yer alan boşlukların değerlendirilmesi için SIBIE (Darbe-Eko’da Spektral Genliklerin Toplanarak Görsellenmesi) ve SAFT (Yapay Açıklıklı Odaklanma Tekniği) algoritmaları kullanılmıştır. Bu amaçla boşluklu metal ard germe kanalı içeren beton bloklar üretilmiş ve boşlukların yerlerini belirlemek için IE ve UE deneyleri gerçekleştirilmiştir. Ayrıca literatürdeki diğer çalışmalardan farklı olarak farklı kalınlıklardaki ard germe kanallarının ultrasonik sinyalin faz değişimine etkisi belirlenmiştir. Çalışma sonunda başarılı bir boşluk görüntülemesinin yanı sıra, hava ve çeliğin akustik empedans karakteristikleri açısından ayırt edici bir malzeme karakterizasyonu gerçekleştirilmiştir.

 


Anahtar kelimeler


elastik dalga; darbe-eko; ultrasonik-eko; boşluk tespiti.

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