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Veerman, R.P. (author), van Breugel, K. (author), Koenders, E.A.B. (author)Chloride-induced corrosion is a point of big concern in reinforced concrete (RC) structures. To monitor the actual health and to predict the remaining service-life of structures, it is important to understand the structural behaviour and the failure mechanism of structures exposed to chlorides under fatigue loading conditions. A beam test,...conference paper 2015
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Pargar, F. (author), Koleva, D.A. (author), van Breugel, K. (author)Free chloride ions are the main cause of steel corrosion in reinforced concrete structures. Ag/AgCl electrodes, as chloride sensors, are predominantly sensitive to chloride ions and respond electrochemically to the chloride ion activity in the environment. This is reflected by changes of the open circuit potential (OCP) of the sensors. To...conference paper 2015
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Patel, R.A. (author), Perko, J. (author), Jacques, D. (author), De Schutter, G. (author), Van Breugel, K. (author), Ye, G. (author)Calcium leaching is one of the important degradation mechanisms causing dissolution of the crystalline phases such as, AFm, portlandite increasing capillary porosity. Further it leads to decalcification of an amorphous C-S-H phase causing increase in the gel porosity and in turn degrading the long term performance of concrete structures. In this...conference paper 2014
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- Van Breugel, K. (author), Van Tuan, N. (author) conference paper 2014
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Susanto, A. (author), Koleva, D.A. (author), Van Breugel, K. (author)This paper reports on the influence of stray current flow on microstructural prop-erties, i.e. pore connectivity and permeability of mortar specimens, and link these to the observed alterations in mechanical properties and cement hydration. Mortar specimens were partly submerged in water and calcium hydroxide (Ca(OH)2) as an external environment...conference paper 2014
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Lukovic, M. (author), Savija, B. (author), Schlangen, E. (author), Ye, G. (author), van Breugel, K. (author)Differential shrinkage between repair material and concrete substrate is considered to be the main cause of premature failure of repair systems (Martinola, Sadouki et al. 2001, Beushausen and Alexander 2007). Magnitude of induced stresses depends on many factors, for example the amount of restraint, moisture gradients caused by different curing...conference paper 2014
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Susanto, A. (author), Koleva, D.A. (author), Van Breugel, K. (author)This paper investigates DC current-induced “curing” and ageing phenomena in cement-based materials. Two current densities were used in a DC current regime i.e. mortar cubes were subjected to DC current flow of 1 A/m2 and 100 mA/m2; tap water and calcium hydroxide were external environment. Conditioning (“curing”) was performed for 112 days,...conference paper 2014
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Pargar, F. (author), Koleva, D.A. (author), Koenders, E.A.B. (author), Van Breugel, K. (author)One of the reported problems associated with the performance of Ag/AgCl electrodes in alkaline environment, as concrete pore water, has been their poor stability. Open circuit potentials are typically observed to be stable for a time period of a few minutes to some days depending on the thickness and microstructure of the sparingly soluble AgCl...conference paper 2014
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Yu, Z. (author), Ye, G. (author), Van Breugel, K. (author), Chen, W. (author)Deterioration of microstructure in cement concrete will cause changes in the transport properties of the concrete. Transport properties at different ages of the concrete provide information about the microstructural changes of the material. A way to measure the transport properties, i.e. the chloride diffusion coefficient, in the laboratory is...conference paper 2014
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Susanto, A. (author), Koleva, D.A. (author), Van Breugel, K. (author), Koenders, E.A.B. (author)Stray current is essentially an electrical current “leakage” from metal conductors and electrical installations. When it flows through cement-based systems, electrical energy is converted to thermal energy that causes increasing temperature due to Joule heating phenomena. The aim of this paper is to shed light on the influence of electrical...conference paper 2014
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Pargar, F. (author), Koleva, D.A. (author), Copuroglu, O. (author), Koenders, E.A.B. (author), van Breugel, K. (author)The level of free chloride concentration in reinforced concrete structures essentially determines the onset of steel corrosion initiation and further propagation. One of the well-known methods for monitoring free chloride concentration is using silver/silver chloride electrodes (Ag/AgCl). These electrodes are sensitive mainly to chloride ions...conference paper 2014
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Van Breugel, K. (author), Van Tuan, N. (author)Ultra High Strength Concrete (UHPC) is generally made with low w/c mixtures and by adding silica fume. Low w/c mixtures, however, exhibit high autogenous shrinkage, while a high amount of silica fume increases the price of these mixtures. For designing ultra high strength mixtures with low autogenous shrinkage and lower costs the possibility of...conference paper 2014
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Van Breugel, K. (author)The increasing demand for quality, durability and sustainability requires a critical evaluation of currently used building codes. Although there is no doubt that we need codes, standards, certificates etc., the existence of these documents are no guarantee that the prescribed quality is realized on the building site. In this paper the essential...conference paper 2014
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Pargar, F. (author), Koleva, D.A. (author), Copuroglu, Oguzhan (author), Koenders, E.A.B. (author), van Breugel, K. (author)The stability of chloride ion selective electrodes in highly alkaline solutions is an important aspect when reliability and feasibility within reinforced concrete applications are concerned. The sensitivity of these electrodes largely depends on the properties of the AgCl layer, including uniformity, porosity, orientation, thickness, etc. These...conference paper 2014
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Pargar, F. (author), Koleva, D.A. (author), Koenders, E.A.B. (author), van Breugel, K. (author)Service life of reinforced concrete structures exposed to chloride enriched environment is well known to be mainly determined by steel passivity breakdown in the event of chloride-induced corrosion initiation and propagation. Since Cl- induced (localized) corrosion is caused by the free (water-soluble) chloride, present in the pore network of a...conference paper 2014
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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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- Aquino, R.J. (author), Koleva, D.A. (author), Koenders, E.A.B. (author), van Breugel, K. (author) conference paper 2013
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- Hu, J. (author), Koleva, D.A. (author), Ma, Y. (author), Schlangen, E. (author), Van Breugel, K. (author) journal article 2013
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Susanto, A. (author), Koleva, D.A. (author), Van Beek, C. (author), Van Breugel, K. (author)Well known is that stray electrical current i.e. current with a spatial distribution in any conductive environment, can affect civil structures, e.g. initiate or enhance steel corrosion or affect microstructural and mechanical properties of the cement-based bulk matrix. While the former is related to polarization effects in conditions of current...conference paper 2013
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Patel, R.A. (author), Perko, J. (author), Jaques, D. (author), De Schutter, G. (author), Ye, G. (author), Van Breugel, K. (author)A Lattice Boltzmann (LB) based reactive transport model intended to capture reactions and solid phase changes occurring at the pore scale is presented. The proposed approach uses LB method to compute multi component mass transport. The LB multi-component transport model is then coupled with the well-established geochemical reaction code PHREEQC...conference paper 2013