document

Corrosion Performance of Composite Galvanic Coatings with Variable Concentration of Polymeric Nanoaggregates and/or Cr(III) Conversion Layers

Koleva, D.A. (author), Taheri, P. (author), Tsvetkova, N. (author), Boshkov, N. (author), Van Breugel, K. (author), De Wit, J.H.W. (author), Mol, J.M.C. (author)

This paper reports on the corrosion performance of composite zinc layers (~ 8µm) on a steel substrate, considering the influence of nano-aggregates and Cr(III) conversion layers, compared to control (only Zn layers) conditions. The main factors, influencing the corrosion performance of Zn in this study are: a) the effect of two concentrations of...

journal article 2011

document

The Influence of Admixed Polymeric Vesicles on Corrosion Performance of Steel in Simulated Pore Solution and/or Reinforced Mortar

Hu, J. (author), Koleva, D.A. (author), Van Breugel, K. (author)

journal article 2011

document

Corrosion Performance of Carbon Steel in Simulated Pore Solution in the Presence of Micelles

Hu, J. (author), Koleva, D.A. (author), De Wit, J.H.W. (author), Kolev, H. (author), Van Breugel, K. (author)

This study presents the results on the investigation of the corrosion behavior of carbon steel in model alkaline medium in the presence of very low concentration of polymeric nanoaggregates [0.0024 wt % polyethylene oxide (PEO)113-b-PS70 micelles]. The steel electrodes were investigated in chloride free and chloride-containing cement extracts....

journal article 2011

document

Electrochemical Performance of Low-Carbon Steel in Alkaline Model Solutions Containing Hybrid Aggregates

Koleva, D.A. (author), Hu, J. (author), De Wit, J.H.W. (author), Boshkov, N. (author), Radeva, T. (author), Milkova, V. (author), Van Breugel, K. (author)

This work reports on the electrochemical performance of low-carbon steel electrodes in model alkaline solutions in the presence of 4.9.10-4 g/l hybrid aggregates i.e. cement extract, containing PDADMAC (poly (diallyl, dimethyl ammonium chloride) / PAA (Poly (acrylic acid)/ PDADMAC over a CaO core. The main objective was to determine if the...

journal article 2010

document

Microstructural Characterization of Reinforced Mortar after Corrosion and Cathodic Prevention in the Presence of Core-Shell Micelles

Koleva, D.A. (author)

This work reports on the microstructural properties of reinforced mortar after chloride-induced corrosion and two regimes of cathodic prevention. Additionally, the impact of a very low concentration polymeric nano-aggregates (core-shell micelles from PEO113-b-PS218), admixed in the mortar mixture is discussed. The study reveals that a very low...

journal article 2010

document

Electrochemical and Microstructural Studies in Reinforced Mortar, Modified with Core-Shell Micelles

Koleva, D.A. (author), Van Breugel, K. (author), Boshkov, N. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author)

This work reports on monitoring chloride-induced corrosion in reinforced mortar specimens, with and without addition of polymeric nano-aggregates in the mortar mixture. The investigation is a novel approach to control steel corrosion in reinforced concrete, hereby reporting the preliminary results, related to one of the main objectives: studying...

journal article 2010

document

Corrosion Performance of Carbon Steel in Micelle-containing Cement Extract

Hu, J. (author), Koleva, D.A. (author), De Wit, J.H.W. (author), Petrov, P. (author), Van Breugel, K. (author)

This study presents the results from a preliminary investigation on the corrosion behavior of low carbon steel in cement extract (CE) in the presence of very low concentration polymeric nanoaggregates (PEO113-b-PS70 micelles). The steel electrodes were investigated in Cl--containing CE as corrosion medium, compared to chloride-free CE as a...

journal article 2010

document

A Preliminary Study on Cathodic Prevention in Reinforced Mortar

Koleva, D.A. (author), Van Breugel, K. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author)

This work presents the preliminary tests on the performance of cathodic prevention (CPre) in reinforced mortar, subjected to aggressive (10% NaCl environment). Cathodic prevention is an electrochemical technique for minimizing, actually "preventing" any eventual corrosion of the steel bars in reinforced concrete. Therefore, the main objective of...

journal article 2010

document

Cathodic Protection or Cathodic Prevention: Can We Optimize Efficiency and/or Reduce Side Effects?

Koleva, D.A. (author), Van Breugel, K. (author), De Wit, J.H.W. (author), Mol, A. (author)

journal article 2010

document

Hybrid Composite Aggregates for Superior Corrosion Performance of Low-Carbon Steel in Model Solutions

Koleva, D.A. (author), Hu, J. (author), Van Breugel, K. (author), Boshkov, N. (author), Radeva, T. (author), Milkova, V. (author)

journal article 2010

document

The Impact of Core-Shell Micelles on Steel Properties and Microstructural Characteristics in Reinforced Mortar after Corrosion and Cathodic Prevention

Koleva, D.A. (author), Hu, J. (author), Van Breugel, K. (author), Boshkov, N. (author)

journal article 2010

document

Preliminary Study on the Self-Healing of Steel, Resulting from the Presence of Nano-Aggregates in Cement Extract

Hu, J. (author), Koleva, D.A. (author), Van Breugel, K. (author), Petrov, P. (author)

journal article 2010

document

Corrosion Performance of Reinforcing Steel in Modified Concrete Mixtures

Koleva, D.A. (author), Van Breugel, K. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author)

journal article 2009

document

Pulse and Steady DC Cathodic Prevention of Reinforced Mortar in Chloride Environment

Koleva, D.A. (author), Van Breugel, K. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author)

journal article 2009

document

Chloride-Induced Corrosion in Reinforced Mortar, Modified with Core-Shell Micelles

Koleva, D.A. (author), Van Breugel, K. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author)

journal article 2009

document

Corrosion Behavior of Steel re-bars in Mortar, Containing Waste Products

Koleva, D.A. (author), Van Breugel, K. (author), De Wit, J.H.W. (author)

journal article 2008

document

Electrochemical Impedance and Potentio-Dynamic Polarization of Construction Steel in Cement Extract, Containing Red Mud and Chloride Contamination

Koleva, D.A. (author), Copuroglu, O. (author), Van Breugel, K. (author), De Wit, J.H.W. (author)

journal article 2008

document

Surface Analysis and Electrochemical Behavior of Zinc Composite Layers, Incorporating Polymer Nano-Micelles

Koleva, D.A. (author), Zhang, X. (author), Petrov, P. (author), Boshkov, N. (author)

This study presents a comparative investigation of the corrosion behavior of zinc (Zn) and nano-composite zinc (ZnC) galvanic layers on a steel substrate in 5% NaCl solution as a corrosion medium.

journal article 2007

document

Investigation of Corrosion and Cathodic Protection in Reinforced Concrete. II: Properties of Steel Surface Layers

Koleva, D.A. (author), De Wit, J.H.W. (author), Van Breugel, K. (author), Lodhi, Z.F. (author), Ye, G. (author)

The present study explores the formation of corrosion products on the steel surface (using as-received low carbon construction steel) in reinforced concrete in conditions of corrosion and subsequent transformation of these layers in conditions of cathodic protection (CP).

journal article 2007

document

Investigation of Corrosion and Cathodic Protection in Reinforced Concrete. I: Application of Electrochemical Techniques

Koleva, D.A. (author), De Wit, J.H.W. (author), Van Breugel, K. (author), Lodhi, Z.F. (author), Van Westing, E. (author)

The electrochemical behavior of steel reinforcement in conditions of corrosion and cathodic protection was studied, using electrochemical impedance spectroscopy (EIS) and compared to reference (noncorroding) conditions. Polarization resistance (PR) method and potentiodynamic polarization (PDP) were employed as well, in addition to ac 2 pin...

journal article 2007