Flexural Performance and Reflective Cracking Behavior of Repair Systems Produced with High Early Strength Cementitious Composites

Yıl 2018, Cilt: 33 Sayı: 1, 117 - 130, 15.03.2018

Gürkan Yıldırım

https://doi.org/10.21605/cukurovaummfd.420685

Öz

In this study, new generation high early strength repair materials compatible with the existing concrete substrate were produced without compromising increased ductility and multiple micro-cracking behavior and the performance of these repairs was compared with a commercially available high early strength repair material. In the first section of the study, basic mechanical properties of monolitically tested mixtures were assessed. In the second section, usability of mixtures produced in the layered state as a repair material was investigated by focusing on flexural performance and reflective cracking behavior. HESECC mixtures produced herein adequately satisfied the early age mechanical properties expected from a certain repair material and layered specimens which significantly minimized the propagation of reflective cracking exhibited relatively higher ductility compared to REP material widely used and available in the related markets.

Anahtar Kelimeler

Engineered cementitious composites, Repair, Bond properties

Erken Yaş Yüksek Dayanımlı Çimento Bağlayıcılı Kompozitlerle Üretilen Onarım Sistemlerinin Eğilme Performansı ve Yansıma Çatlağı Davranışı

Öz

Çalışma kapsamında, yüksek süneklilik ve çekme yüklemeleri altında sergilenen çoklu dar çatlak genişlikleri özelliklerinden ödün vermeden erken yaş yüksek dayanımlı ve onarılacak beton ile en yüksek derecede bağ kuracak yeni nesil onarım malzemeleri tasarlanmış ve bu malzemelerin performansı piyasada yaygın olarak kullanılan bir başka onarım malzemesiyle karşılaştırılmıştır. Çalışmanın birinci bölümünde monolitik halde test edilen karışımların temel mekanik özellikleri değerlendirilmiştir. İkinci bölümde ise tabakalı olarak hazırlanan karışımların onarım malzemesi olarak kullanılabilirlikleri eğilme performansı ve yansıma çatlağı davranışları göz önünde bulundurularak değerlendirilmiştir. Çalışma kapsamında üretilen HESECC karışımlarının tamamı literatürde bir onarım malzemesinden erken yaşta beklenen temel mekanik özelliklerin tamamını fazlasıyla karşılamış ve üretilen tabakalı numuneler, piyasada yaygın bir şekilde kullanılan OM numunelerine kıyasla çok daha sünek bir davranış sergileyerek yansıma çatlağının yayılımını önemli ölçüde azaltmıştır.

Anahtar Kelimeler

Tasarlanmış çimento bağlayıcılı kompozitler, Onarım, Bağ özellikleri

Kaynakça

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