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Wiktor, V.A.C. (author), Sangadji, S. (author), Jonkers, H.M. (author), Schlangen, H.E.J.G. (author)Bacterially induced calcium carbonate precipitation has received considerable attention for its potential application in enforcing or repairing construction material. The mechanism of bacterially mediated calcite precipitation in those studies is primarily based on the enzymatic hydrolysis of urea. Besides calcite precipitation, this reaction...conference paper 2013
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Palin, D. (author), Wiktor, V. (author), Jonkers, H.M. (author)Marine concrete structures are exposed to one of the most hostile of natural environments. Many physical and chemical phenomena are usually interdependent and mutually reinforcing in the deterioration of marine exposed concrete: expansion and microcracking due to physical effects increases concrete permeability paving the way for harmful...conference paper 2013
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Varini, M. (author), Koleva, D.A. (author), Denkova, A.G. (author), Mol, J.M.C. (author), Terryn, H. (author), Van Breugel, K. (author)Polymeric nano-materials utilization in reinforced concrete, aiming to deal with steel corrosion was developed in previous works. Promising results were obtained with PEO–b–PS nano-formations, both in terms of enhanced bulk matrix properties and improved steel corrosion resistance. Recent research has been focusing on a cheaper and commercially...conference paper 2013
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De Belie, N. (author), Du Prez, F. (author), Terryn, H. (author), Wallaeys, B. (author)Abstract only.conference paper 2013
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Maes, M. (author), Van Tittelboom, K. (author), De Belie, N. (author)A lot of damage is reported for constructions in marine environments. Marine environments are very aggressive, because of the high chloride concentration in sea water. Chlorides affect durability by initiating corrosion of the reinforcement steel. When cracks appear in the concrete structures, chlorides will penetrate faster and will initiate...conference paper 2013
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Symeonidou, I. (author), Hirschberg, U. (author), Kaftan, M. (author)Designing the Negative was the title of a Master Studio that took place at the Institute of Architecture and Media of Graz University of Technology during the summer semester of 2012. Students designed and fabricated prototypes of customized concrete formwork as part of their studio assignment. The studio theme forced students to think about...conference paper 2013
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Schipper, H.R. (author), Grünewald, S. (author), Kok, M.A.D. (author), Nijsse, R. (author), Raghunath, P. (author)In an earlier article (CPI issue of August 2011 [1]) a method was presented for producing precast curved panels with a thickness of a few centimeters using the 'flexible mould method'. This method is the central theme in the PhD study of the first author on the realization of freeform architecture in concrete. The concrete panels manufactured...journal article 2013
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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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- Sarkhosh, R. (author) doctoral thesis 2014
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Wiktor, V.A.C. (author), Jonkers, H.M. (author)This paper focuses particularly on the ageing of concrete due to micro-crack formation or freeze/thaw which results in an increased permeability of the concrete. The bacteria-based repair system presented in this paper aims at recovering the concrete permeability thanks to bacteria-induced calcium carbonate precipitation inside cracks/porosity....conference paper 2014
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Pradena, M. (author), Houben, L.J.M. (author)Concrete pavements (CPs) are durable and they do not need periodic invasive maintenance interventions. Nevertheless, CPs are hardly chosen when only initial costs, instead of life-cycle costs, are considered in the evaluation. Nowadays, there are innovations in Jointed Plain Concrete Pavements (JPCPs) that reduce initial costs about 25% with...conference paper 2014
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- Van Breugel, K. (author), Van Tuan, N. (author) conference paper 2014
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Application of acoustic emission measurements in the evaluation of prestressed cast in-between decksVan Hemert, P.H.A. (author), Fennis-Huijben, S.A.A.M. (author), Hordijk, D.A. (author)A large number of concrete structures, that is built in the sixties and seventies of the twentieth century, need to be re-evaluated. It should be judged whether their capacity is still sufficient for the increased traffic loads. Acoustic emission (AE) is a non-destructive technique that can possibly be used to get a better insight in the...conference paper 2014
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Wiktor, V.A.C. (author), Jonkers, H.M. (author)This paper presents the field performance in a parking garage of the recently developed bacteria-based repair system for concrete. This liquid-based repair system aims at the sealing of cracks and decrease of the porosity due to the production of a calcium-based biomineral. The system combines advantages of both a traditional repair system for...journal article 2015
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Sangadji, S. (author)The high energy consumption, its corresponding emission of CO2 and financial losses due to premature failure are the pressing sustainability issues which must be tackled by the concrete infrastructure industry. Enhancement of concrete materials and durability of structures (designing new infrastructures for longer service life) is one solution...doctoral thesis 2015
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Magalhaes Pereira, L.F. (author), Weerheijm, J. (author), Sluys, L.J. (author)The development of realistic numerical tools to efficiently model the response of concrete structures subjected to close-in detonations and high velocity impacts has been one of the major quests in defense research. Under these loading conditions, quasi-brittle materials undergo a multitude of failure (damage) mechanisms. Dynamic tensile failure...conference paper 2015
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Yu, Z. (author)Fly ash is a by-product of burning coal in electric power generating plants. It is commonly known that owing to its pozzolanic properties fly ash is widely used as a partial replacement for Portland cement in concrete. The use of fly ash in concrete not only reduces the landfill costs of fly ash, but also reduces the use of Portland cement in...doctoral thesis 2015
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Palin, D. (author), Thijssen, A. (author), Wiktor, V. (author), Jonkers, H.M. (author), Schlangen, H.E.J.G. (author)Ordinary Portland cement (OPC) mortar specimens submerged in sea-water were analysed through environmental scanning electron microscopy (ESEM) in back scattered electron (BSE) mode and nano-scratching. Results from both sets of analysis show the presence of distinct phases associated with aragonite, brucite and cement paste. Phases associated...conference paper 2015
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Bonifazi, G. (author), Capobianco, G. (author), Serranti, S. (author), Eggimann, M. (author), Wagner, E. (author), Di Maio, F. (author), Lotfi, S. (author)Aim of this work was to investigate the microstructure of the Interfacial Transition Zone (ITZ) between cement paste and aggregate in concrete utilizing Scanning Electron Microscope (SEM) in order to identify possible effects on the ITZ related to different recipes and production parameters. SEM is an important tool to carry out concrete, cement...conference paper 2015
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Wiktor, V. (author), Jonkers, H.M. (author)Biodeposition, a method by which calcium carbonate (CaCO3) precipitation is induced by bacteria, has been proposed as an interesting approach to protect building materials. The liquid-based system presented in this paper aims at the sealing of cracks and decrease of the porosity due to the production of a calcium-based biomineral. In this system...conference paper 2015