document

Design of a plant producing 500,000 tones/annum synthetic oil products from natural gas, using Fischer-Tropsch technology

Bai, B. (author), Hu, J. (author), Liu, N. (author), Jiao, Y. (author), Wang, Z. (author)

Document(en) uit de collectie Chemische Procestechnologie

report 2004

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

document

Size characterisation of pore structure for estimating transport properties of cement paste

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

journal article 2005

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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

document

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

document

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

document

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

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

An improved cathodic protection (CP), based on pulse regime was investigated in reinforced concrete, compared to conventional CP. Both regimes used CP current in the range of 2 to15 mA/m2. A voltage-to-current converter maintained the pulse current, the latter adjusted with duty cycle of 12% to 50 % and frequency of 500 Hz to 1 kHz. The...

journal article 2006

document

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

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

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

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

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

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

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

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

document

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

document

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

document

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