Chloride-induced corrosion of steel in cracked concrete – Part I: Experimental studies under accelerated and natural marine environments

Parallel corrosion experiments were carried out for 2¼ years by exposing one half of 210 beam specimens (120 × 130 × 375 mm long) to accelerated laboratory corrosion (cyclic wetting and drying) while the other half underwent natural corrosion in a marine tidal zone. Experimental variables were crack width w sub cr (0, incipient crack, 0.4, 0.7 mm), cover c (20, 40 mm), binder type (PC, PC/GGBS, PC/FA) and w/b ratio (0.40, 0.55). Results show that corrosion rate (i sub corr) was affected by the experimental variables in the following manner: i sub corr increased with increase in crack width, and decreased with increase in concrete quality and cover depth. The results also show that the corrosion performance of concretes in the field under natural corrosion cannot be inferred from its performance in the laboratory under accelerated corrosion. Other factors such as corrosion process should be taken into account.

[1]  Carmen Andrade,et al.  Corrosion rate monitoring in the laboratory and on-site , 1996 .

[2]  R. A. Buchanan,et al.  Fundamentals of Electrochemical Corrosion , 2000 .

[3]  J. M. Miranda,et al.  Considerations on reproducibility of potential and corrosion rate measurements in reinforced concrete , 2004 .

[4]  A. Scott,et al.  The influence of binder type and cracking on reinforcing steel corrosion in concrete , 2004 .

[5]  Nick R. Buenfeld,et al.  The use of small electrochemical perturbations to assess the corrosion of steel in concrete , 1998 .

[6]  Y. Ballim,et al.  Reinforcement corrosion and the deflection of RC beams––an experimental critique of current test methods , 2003 .

[7]  Wichian Chalee,et al.  Effect of the Water to Binder Ratio and Ground Fly Ash on Properties of Recycled Aggregate Concrete , 2012 .

[8]  Mark Alexander,et al.  Durability design of reinforced concrete structures: a comparison of the use of durability indexes in the deemed-to-satisfy approach and the full-probabilistic approach , 2012 .

[9]  Khaled Soudki,et al.  Effectiveness of Impressed Current Technique to Simulate Corrosion of Steel Reinforcement in Concrete , 2003 .

[10]  Hans Beushausen,et al.  Corrosion in cracked and uncracked concrete – influence of crack width, concrete quality and crack reopening , 2010 .

[11]  Marta Castellote,et al.  Chloride threshold dependence of pitting potential of reinforcements , 2002 .

[12]  P Fidjestol,et al.  The Effect of Cracks on Reinforcement Corrosion in High-Performance Concrete in a Marine Environment , 1996, SP-163: Third CANMET/ACI International Conference on Performance of Concrete in Marine Environment.

[13]  M. S. Elgarf,et al.  Flexural Strength of Concrete Beams with Corroding Reinforcement , 1999 .

[14]  J. Ollivier,et al.  Ion diffusion in microcracked concrete , 1992 .

[15]  H. Böhni,et al.  7 – Macrocell corrosion of steel in concrete – experiments and numerical modelling , 2007 .

[16]  C. L. Page,et al.  An investigation of galvanostatic transient methods used to monitor the corrosion rate of steel in concrete , 1993 .

[17]  Mark Alexander,et al.  The influence of binder type, cracking and cover on corrosion rates of steel in chloride-contaminated concrete , 2007 .

[18]  Kenneth C. Hover,et al.  Influence of microcracking on the mass transport properties of concrete , 1992 .

[19]  Mark Alexander,et al.  A chloride conduction test for concrete , 1995 .

[20]  Yingang Du,et al.  Structural performance of corrosion-damaged concrete beams , 2008 .

[21]  EARLY CHLORIDE CORROSION OF REINFORCING STEEL IN CONCRETE , 1985 .

[22]  J. G. Cabrera,et al.  Deterioration of concrete due to reinforcement steel corrosion , 1996 .

[23]  Y. Ballim,et al.  A framework for use of durability indexes in performance-based design and specifications for reinforced concrete structures , 2008 .

[24]  C. M. Rangel,et al.  Use of EIS, ring-disk electrode, EQCM and Raman spectroscopy to study the film of oxides formed on iron in 1 M NaOH , 2002 .

[25]  M. Raupach.  CHLORIDE-INDUCED MACROCELL CORROSION OF STEEL IN CONCRETE - THEORETICAL BACKGROUND AND PRACTICAL CONSEQUENCES , 1996 .

[26]  A. Bentur.  Steel corrosion in concrete , 1997 .

[27]  Nick R. Buenfeld,et al.  Factors influencing chloride-binding in concrete , 1990 .

[28]  Vicente Feliu,et al.  Corrosion estimates from the transient response to a potential step , 2007 .

[29]  James Ronald Mackechnie,et al.  Predictions of reinforced concrete durability in the marine environment , 1995 .

[30]  Michael Raupach,et al.  Laboratory Studies and Calculations on the Influence of Crack Width on Chloride-Induced Corrosion of Steel in Concrete , 1997 .

[31]  Adam Neville,et al.  Autogenous Healing—A Concrete Miracle? , 2002 .