document

Porosity of Concrete - Morphological Study of Model Concrete

Hu, J. (author)

This study has developed a comprehensive methodological framework for characterizing geometrical and morphological aspects of pore space in cementitious materials and explored its application to actual cement pastes and model concretes for the purpose of predicting mechanical and transport properties of cementitious materials. The evolution of...

doctoral thesis 2004

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Steel Corrosion in Mortar Specimens, Deteriorated by Chloride Ingress: Electrochemical Study Using AC and DC Methods and Microscopic Analysis of the Steel/Mortar Interface

Koleva, D.A. (author), Fraaij, A.L.A. (author), Hu, J. (author), Boshkov, N. (author)

journal article 2005

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Conventional and Pulse Cathodic Protection of Reinforced Concrete: Electrochemical Approach and Microstructural Investigations

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

journal article 2005

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Shape characterization of concrete aggregate

Stroeven, P. (author), Hu, J. (author)

As a composite material, the performance of concrete materials can be expected to depend on the properties of the interfaces between its two major components, aggregate and cement paste. The microstructure at the interfacial transition zone (ITZ) is assumed to be different from the bulk material. In general, properties of conventional concrete...

journal article 2006

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Apparatus for cathodic protection of steel reinforced concrete structures and method

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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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

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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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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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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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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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Trends in temperature and rainfall extremes in the Yellow River source region, China

Hu, Y. (author), Maskey, S. (author), Uhlenbrook, S. (author)

Spatial and temporal changes in daily temperature and rainfall indices are analyzed for the source region of Yellow River. Three periods are examined: 1960–1990, 1960–2000 and 1960–2006. Significant warming trends have been observed for the whole study region over all the three periods, particularly over the period 1960–2006. This warming is...

journal article 2011

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Recycling of WEEE by magnetic density separation

Hu, B. (author), Giacometti, L. (author), Di Maio, F. (author), Rem, P.C. (author)

The paper introduces a new recycling method of WEEE: Magnetic Density Separation. By using this technology, both grade and recovery rate of recycled products are over 90%. Good separations are not only observed in relatively big WEEE samples, but also in samples with smaller sizes or electrical wires.

conference paper 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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Interaction between hydrodynamics and salt marsh dynamics: An example from Jiangsu coast

Hu, Z. (author), Stive, M.J.F. (author), Zitman, T.J. (author), Ye, Q.H. (author), Wang, Z.B. (author), Luijendijk, A. (author), Gong, Z. (author), Suzuki, T. (author)

Salt marshes are distributed along more than 400 km of the Jiangsu coast in Eastern China, which are regarded as important habitats and serve as coastal protection as well. Previous research has proven that salt-marsh vegetation can reduce current velocity and dampen waves by its stems and leaves. Reversely, hydrodynamic forces also have a...

conference paper 2011

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The effect of activating solution on the mechanical strength, reaction rate, mineralogy, and microstructure of alkali-activated fly ash

Ma, Y. (author), Hu, J. (author), Ye, G. (author)

Alkali-activated fly ash (AAF) is a promising material that exhibits comparable material properties as cement-based materials but with much less CO2 emission. In the present work, the effect of activating solution (SiO2 and Na2O content) on the performance of AAF was studied by means of isothermal calorimetry and X-ray diffraction analysis....

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 effect of electrical current flow on cement-based microstructure: Bulk matrix alterations within cathodic protection in reinforced concrete

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

conference paper 2012

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Tailor-made nano materials for corrosion control and improved matrix characteristics in cement-based systems

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

conference paper 2012