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Nooru-Mohamed, M.B. (author)In this report, the results of a numerical parameter study on temperature stresses caused by hydration of cement in concrete breakwater elements are shown. Two different geometries were analysed namely hollow cubes and tetrapods. The problem encountered in solid cube breakwaters is the undesirable temperature build up between the core and the...report 1994
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- Koenders, E.A.B. (author) doctoral thesis 1997
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Koenders, E.A.B. (author), Van Breugel, K. (author)In this paper a numerical model is presented with which it is possible to predict the non-thermal hydration-induced volume changes that develop during hardening of a cement-based material. The model equilibrates the relative humidity in the pore system with the free surface energy in hardening cement past. From a certain state of equilibrium,...journal article 1998
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De Rooij, M.R. (author), Bijen, J.M.J.M. (author)Optical microscopy using thin sections has become more and more important over the last decade to study concrete. Unfortunately, this technique is not capable of studying actually hydrating cement paste. At Delft University of Technology a new technique has been developed using 'active' thin sections. This technique allows microscopic...journal article 1999
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Van Beek, A. (author), Milhorst, M.A. (author)The dielectric properties of concrete can be used to characterize the development of the microstructure of the cement paste. During hydration the microstructure changes and so does the amount of water in the pore structure. The different dielectric properties of the pore water and the solid phases can be measured with microwave frequencies. In...journal article 2000
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- Brons, M.E. (author), Hoff, M.P. (author), Jansen, J.H.M. (author), Seveke, E.P.E. (author) report 2000
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- Ye, G. (author), Liu, X. (author), Poppe, A.M. (author), De Schutter, G. (author), Van Breugel, K. (author) journal article 2007
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Golombok, M. (author), Ineke, E. (author), Luzardo, J.C.R. (author), He, Y.Y. (author), Zitha, P. (author)We analyse the kinetics of CO2 and methane hydrate formation. The characteristic formation times are associated with different steps of the formation process. Conditions for minimising these rate times are identified while maintaining a regime where CO2 hydrate is formed and methane remains predominantly gaseous. This involves a rapid...journal article 2008
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Mohamad Sabil, K. Bin (author)In view of the possibilities for new development of carbon dioxide hydrate processes, this study focused on experimental measurements to obtain fundamental insight into the phase behaviour and the kinetic of formation of carbon dioxide hydrate forming systems. These data are essential for the development of process design of any carbon dioxide...doctoral thesis 2009
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- Huang, H. (author), Ye, G. (author) conference paper 2011
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Koenders, E.A.B. (author), Ukrainczyk, N. (author), Hansen, W. (author)Latest developments in Hymostruc enable the possibility to evaluate the pore connectivity of an evolving microstructure while also considering the contribution of the ITZ and air voids and to examine the influence on frost durability. The numerical model is used to visualize this phenomenon and to show the contribution of both the pores and the...conference paper 2012
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Ukrainczyk, N. (author), Koenders, E.A.B. (author), Van Breugel, K. (author)The prospect of cement and concrete technologies depends on more in depth understanding of cement hydration reactions. Hydration reaction models simulate the development of the microstructures that can finally be used to estimate the cement based material properties that influence performance and service life. In this paper the multicomponent...conference paper 2012
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He, Y. (author)Gashydraatvorming is een kristallisatieproces. Dit proces bestaat uit twee fases, respectievelijk nucleatie (de vorming van nucleatie kernen) en hydraatgroei (degroei van kleine nucleatiekernen tot grote hydraatkristallen). Deze twee fases van het kristallisatieproces worden in het binaire systeem gekenmerkt door de nucleatietijd en de...doctoral thesis 2012
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Huan He, H. (author), Le, N.L.B. (author), Stroeven, P. (author)Durability of concrete in engineering structures is becoming more and more of a major problem. Research into such problems is complicated and expensive, however. Developments in computer technology make it possible nowadays realistically simulating cementitious materials and studying its pore network structure. In this paper use is made of the...journal article 2012
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Caggiano, A. (author), Pepe, M. (author), Koenders, E.A.B. (author), Martinelli, E. (author), Etse, G.J. (author)Heat production induced by the hydration reaction and the resulting temperature evolution in the early phases of setting and hardening processes are critical phenomena, often leading to premature cracking of concrete members. However, the interest for simulating such phenomena is also related to the fundamental relationships between the nature...conference paper 2012
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Stroeven, P. (author), He, H. (author), Le, L.B.N. (author)Realistic simulation of particulate materials like concrete on meso- as well as micro-level is nowadays possible by fast developments in computer technology. This would be a more economic way than by physical experiinents, which are more time-consuming, laborious and thus expensive. This concern the production of the aggregate structure or of...conference paper 2012
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Stroeven, P. (author), Le, L.B.N. (author)Porosimetry of matured cementitious materials is of hiigh interest, because durability is governed by the capillary pore network structure. Experimental approaches are time-consuming, laborious and thus expensive. Fast developments in computer technology make it nowadays possible quite realistically producing cementitious materials in virtual...conference paper 2013
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- Koenders, E.A.B. (author), Pepe, M. (author), Caggiano, A. (author), Martinelli, E. (author), Toledo Filho, R.D. (author) conference paper 2013
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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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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