Effect of early age shrinkage cracks on the corrosion of rebar embedded in ultra high performance concrete with and without fibers

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Erten E., YALÇINKAYA Ç., Beglarigale A., YİĞİTER H., YAZICI H.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.32, sa.4, ss.1347-1364, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 4
  • Basım Tarihi: 2017
  • Doi Numarası: 10.17341/gazimmfd.369857
  • Dergi Adı: JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.1347-1364
  • Anahtar Kelimeler: Ultra high performance concrete, steel reinforcement, durability, chloride induced corrosion, corrosion current density, CHLORIDE, STEEL
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this study, early age (first 24 hours) shrinkage properties of Ultra High Performance Concrete (UHPC) mixtures with and without fibers, exposed to two different initial curing conditions, were investigated. The effect of early age shrinkage cracks on development of corrosion of steel reinforcement embedded in UHPC has been determined experimentally. Some negative effects of restrained shrinkage cracks on corrosion of embedded steel reinforcement were determined. In spite of the cracks formation on the surface of UHPC specimens with low water to binder ratio, the UHPC mixtures showed generally good performance in terms of the protection of rebar against corrosion. Although cracks formed on surfaces of impermeable UHPC mixtures, which consist of low water to binder ratio, UHPC showed generally good performance on the protection of steel corrosion. The most important characteristic of UHPC is superior durability due to its impermeable nature. In order to maintain the durability properties of UHPC, necessary precautions should be taken to prevent early age cracks. The analysis conducted in this study revealed that fly ash replacement and micro steel fiber reinforcement enhanced protection against corrosion of rebars by means of reducing crack formation.