Ductile fibre reinforced cementitious composites (DFRCC) for improved corrosion durability of reinforced concrete columns

Faiz Uddin Ahmed Shaikh,Mohamed Maalej,Salah Al Toubat

doi:10.3934/matersci.2017.5.1078

Faiz Uddin Ahmed Shaikh, Mohamed Maalej + Show 1 more

Open Access

https://doi.org/10.3934/matersci.2017.5.1078

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Abstract

This paper reports the results of an experimental program on the effectiveness of ductile fibre reinforced cementitious composites (DFRCC) in retarding the corrosion of steel, corrosion induced damage and post-corrosion structural behaviour of reinforced concrete (RC) columns. Two series RC columns are included in this program. The first series consists of ordinary RC columns that are subjected to an accelerated corrosion regime. The second series consists of two columns that are similar to first two series in every aspect, except that the ordinary concrete in the column is replaced with a ductile DFRCC material. Two types of DFRCC materials are considered: a hybrid-fibre DFRCC containing 1.5 vol.% PVA fibers and 1 vol.% steel fibers and a mono-fibre DFRCC containing 2.5 vol.% PVA fibers. Specimens of the second series are also subjected to a regime of accelerated corrosion. Corrosion damage, including the possible development of spalling and/or delamination, is monitored in each specimen using a specially-fabricated mechanical expansion collar. Based on the collective findings from theoretically-estimated steel losses, visual recordings of corrosion damage, and measurements of the tendency of cover delaminate, it was concluded that the steel reinforced DFRCC columns had a remarkably higher resistance against reinforcement corrosion compared to the ordinary RC columns. The corrosion damaged DFRCC columns also exhibited about 23–64% higher failure load than that of corrosion damaged RC columns and no sign of spalling of cover of columns in the structural test.

Highlights

Aging infrastructure facilities, those made of reinforced concrete (RC), are currently deteriorating faster than they are being rehabilitated or replaced
This paper reports the results of an experimental program on the effectiveness of ductile fibre reinforced cementitious composites (DFRCC) in retarding the corrosion of steel, corrosion induced damage and post-corrosion structural behaviour of reinforced concrete (RC) columns
This paper presented the results of an experimental program on the effectiveness of ductile fibre reinforced cementitious composites (DFRCC) in retarding the corrosion of steel, superior corrosion induced damage resistance and structural response of corroded columns

Summary

Introduction

Those made of reinforced concrete (RC), are currently deteriorating faster than they are being rehabilitated or replaced. A major cause of concrete deterioration is corrosion of the reinforcing steel in the structure resulting from chloride penetration [1,2,3]. A large radial pressure is exerted on the surrounding concrete, which may result in local radial cracks. These cracks can propagate along the bar, producing longitudinal cracks, which can result in severe corrosion problems, and leading to general corrosion of the reinforcing bar as the corrosion reaction develops and propagates along the bar. Large internal cracks forming along the plane of the corroded reinforcing bars may propagate, resulting in extensive delamination in the structure and seriously compromising its structural integrity [5,6]

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