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Bio-inspired control of material properties in civil engineering: Current concept for corrsoion protection via the application of bacteria and bio-polymers

Koleva, D.A. (author), Jonkers, H.M. (author), van Breugel, K. (author)

The improvement of material properties of cement-based materials e.g. reduced permeability, porosity, uniform distribution of hydration products, etc. is of a significant importance and related to durability and sustainability of concrete and reinforced concrete structures. With this respect, a recent and novel approach is to "create" self...

journal article 2013

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Early age hydration, microstructure and micromechanical properties of cement paste modified with polymeric vesicles

Hu, J. (author), Koleva, D.A. (author), Ma, Y. (author), Schlangen, E. (author), Van Breugel, K. (author)

journal article 2013

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Mechanical, electrical and microstructural properties of cement-based materials in conditions of stray current flow

Susanto, A. (author), Koleva, D.A. (author), Copuroglu, O. (author), Van Beek, C. (author), Van Breugel, K. (author)

This investigation presents a comparative study on mechanical properties, electrical resistivity and microstructure of mortar under DC current, compared to mortar in rest (no current) conditions. Monitoring was performed from 24h after casting until 84 days of cement hydration. A current density level of 10 mA/m2 was chosen as a simulation...

journal article 2013

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The Influence of PEO113-b-PS780 Vesicles on the Corrosion Performance of Carbon Steel in Simulated Pore Solution

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

This study presents the results from a preliminary investigation on the corrosion behavior of carbon steel in cement extract (CE) in the presence of very low concentration (0.0024 wt. %) polymeric nano-aggregates (PEO113-b-PS780 vesicles). Two types of vesicles were studied: vesicles with a CaO-containing core and vesicles with an “empty” core....

journal article 2012

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Corrosion performance of reinforced mortar in the presence of polymeric nano-aggregates: Electrochemical behavior, surface analysis, and properties of the steel/cement paste interface

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

This study reports on the effect of admixed polyethylene oxide-b-polystyrene (PEO113-b-PS70)micelles on corrosion behavior of reinforced mortar. The electrochemical measurement shows that the corrosion performance of the reinforcing steel was not significantly improved. However, surface analysis and microstructural investigation at the steel...

journal article 2012

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The Integration of EIS parameters and bulk matrix characterization in studying reinforced cement-based materials

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

Corrosion in reinforced concrete is a major and costly concern, arising from the higher complexity of involved phenomena on different levels of material science (e.g. electrochemistry, concrete material science) and material properties (macro/micro/ nano). Reinforced cement-based systems (e.g. reinforced mortar and concrete) are multi-phase...

journal article 2012

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The integration of eis parameters and bulk matrix characteristics in studying reinforced cement-based materials

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

Corrosion in reinforced concrete is a major and costly concern, arising from the higher complexity of involved phenomena on different levels of material science (e.g. electrochemistry, concrete material science) and material properties (macro/micro/ nano). Reinforced cement-based systems (e.g. reinforced mortar and concrete) are multi-phase...

journal article 2011

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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

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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

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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

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Effect of Admixed Micelles on the Microstructure Alterations of Reinforced Mortar Subjected to Chloride Induced Corrosion

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

This paper reports the main results from the influence of the initially admixed nano-aggregates (0.5 g/l PEO113-b-PS70 micelles previously dissolved in demi-water) on microstructural alterations of the reinforced mortar subjected to chloride induced corrosion. The morphology of hydration/corrosion products at the steel/cement paste interface and...

journal article 2011

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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

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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

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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

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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

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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

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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

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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

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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

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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