Quantitative estimation on delaying of onset of corrosion of rebar in surface treated concrete using sealers

Abstract Surface treatment on the concrete surface using sealers reduces the rate of permeability of chloride and moisture through the concrete. The delaying of onset of corrosion is evaluated for surface treated and untreated concrete using electrochemical techniques. After conducting rapid chloride permeability test (RCPT), using Nernst–Plank equation, the diffusion coefficient of chloride ( D eff ) is calculated. Substituting threshold chloride concentration of rebar ( C th ) from cyclic polarization test in the ficks second law, the time to initiation of corrosion ( T i ) is arrived. From the results it is found that the treated concrete with alkyltrialkoxy silane sealer delays the onset of corrosion by four times than that of untreated concrete.

[1]  B. Oh,et al.  PREDICTION OF DIFFUSIVITY OF CONCRETE BASED ON SIMPLE ANALYTIC EQUATIONS , 2004 .

[2]  H. Saricimen,et al.  Effect of waterproofing coatings on steel reinforcement corrosion and physical properties of concrete , 2002 .

[3]  Iraj H. P. Mamaghani,et al.  Evaluation of Penetrating Sealers for Reinforced Concrete Bridge Decks , 2009 .

[4]  J. G. Cabrera,et al.  ASSESSMENT OF THE EFFECTIVENESS OF SURFACE TREATMENTS AGAINST THE INGRESS OF CHLORIDES INTO MORTAR AND CONCRETES , 1994 .

[5]  Omar Saeed Baghabra Al-Amoudi,et al.  Attack on plain and blended cements exposed to aggressive sulfate environments , 2002 .

[6]  Luping Tang,et al.  ELECTRICALLY ACCELERATED METHODS FOR DETERMINING CHLORIDE DIFFUSIVITY IN CONCRETE - CURRENT DEVELOPMENT , 1996 .

[7]  Y. Wang.  Chloride Transport in Concrete , 2011 .

[8]  Rd Hooton,et al.  Dependence of rate of absorption on degree of saturation of concrete , 2002 .

[9]  S. Srinivasan,et al.  Quantification of hydrated cement products of blended cements in low and medium strength concrete using TG and DTA technique , 2003 .

[10]  B. Scheetz,et al.  Characterization of silicate sealers on concrete , 1997 .

[11]  B. T. Molloy,et al.  Influence of PFA, slag and microsilica on chloride induced corrosion of reinforcement in concrete , 1991 .

[12]  N. R. Short,et al.  Factors affecting the corrosion rate of steel in carbonated mortars , 1991 .

[13]  C. Andrade,et al.  Relation between resistivity and corrosion rate of reinforcements in carbonated mortar made with several cement types , 1988 .

[14]  Mark G. Richardson,et al.  Corrosion inhibitors for steel in concrete: State-of-the-art report , 2008 .

[15]  Zdenek P. Bazant,et al.  PHYSICAL MODEL FOR STEEL CORROSION IN CONCRETE SEA STRUCTURES­ THEORY , 1979 .

[16]  M. Saremi,et al.  A study on chloride-induced depassivation of mild steel in simulated concrete pore solution , 2002 .

[17]  D W Fowler,et al.  Field evaluation of bridge corrosion protection measures , 1993 .

[18]  S. Srinivasan,et al.  Studies on strength and permeability characteristics of blended cements in low and medium strength concretes , 2004 .

[19]  G. Litvan,et al.  LABORATORY INVESTIGATION OF CONCRETE SEALERS , 1989 .

[20]  Mohammed K. Ibrahim,et al.  Effectiveness of concrete surface treatmentmaterials in reducing chloride-induced reinforcement corrosion , 1997 .

[21]  John D Wenzlick.  Bridge Deck Concrete Sealers , 2007 .