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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
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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
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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
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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
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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
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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
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- Koleva, D.A. (author), Van Breugel, K. (author), De Wit, J.H.W. (author), Mol, A. (author) journal article 2010
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- Koleva, D.A. (author), Van Breugel, K. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author) journal article 2009
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- Koleva, D.A. (author), Van Breugel, K. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author) journal article 2009
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- Koleva, D.A. (author), Van Breugel, K. (author), Mol, J.M.C. (author), De Wit, J.H.W. (author) journal article 2009
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Koleva, D.A. (author), Zhang, X. (author), Petrov, P. (author), Boshkov, N. (author), Van Breugel, K. (author), De Wit, J.H.W. (author), Mol, J.M.C. (author), Tsvetkova, N. (author)This study reports on a comparative investigation of the corrosion behavior of zinc (Zn) and nano-composite zinc (ZnC) galvanic layers in 5% NaCl solution. The metallic matrix of the ZnC layers incorporates nano-sized, stabilized polymeric aggregates, formed from the amphiphilic tri-block co-polymer: poly(2-hydroxyethyl methacrylate) - poly ...journal article 2008
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- Koleva, D.A. (author), Van Breugel, K. (author), De Wit, J.H.W. (author) journal article 2008
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- Koleva, D.A. (author), Copuroglu, O. (author), Van Breugel, K. (author), De Wit, J.H.W. (author) journal article 2008
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Koleva, D.A. (author), Van Breugel, K. (author), De Wit, J.H.W. (author), Fraaij, A.L.A. (author), Boshkov, N. (author)The present study explores the formation of corrosion products on the steel surface in reinforced concrete in conditions of corrosion and subsequent transformation of these layers in conditions of cathodic protection (CP). Of particular interest was to investigate if the introduced pulse CP (as cost- effective alternative of CP) will lead to...journal article 2007
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Koleva, D.A. (author), Van Breugel, K. (author), De Wit, J.H.W. (author), Fraaij, A.L.A. (author), Boshkov, N. (author)The electrochemical behavior of steel reinforcement in conditions of corrosion and cathodic protection (CP) was studied, using electrochemical impedance spectroscopy (EIS) and compared to reference (non-corroding) conditions. Polarization resistance (PR) method and potentio-dynamic polarization (PDP) were employed as well, in addition to AC 2...journal article 2007
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Koleva, D.A. (author), De Wit, J.H.W. (author), Van Breugel, K. (author), Bachvarov, V. (author), Kolev, H. (author), Fraaij, A. (author)The corrosion behavior of reinforcing steel, previously embedded in concrete and maintained in conditions of corrosion and two regimes (conventional and pulse) of cathodic protection (CP), was characterized using electrochemical measurements in cement extract (CE) solutions of pH 12.6. The investigation aimed at determination of the properties...journal article 2007
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- Koleva, D.A. (author), Hu, J. (author), Van Beek, K. (author), Van Breugel, K. (author), De Wit, J.H.W. (author) patent 2007
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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
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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
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Koleva, D.A. (author), Van breugel, K. (author), De Wit, J.H.W. (author), Van Westing, E. (author), Boshkov, N. (author), Fraaij, A.L.A. (author)The behavior of steel reinforcement was studied using electrochemical impedance spectroscopy (EIS) and polarization resistance (PR) techniques in conditions of chloride-induced corrosion in ordinary Portland cement-mortar specimens immersed in 7% NaCl for a test period of 120 days and compared to specimens immersed in demineralized water for the...journal article 2007
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