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Vrijders, Jeroen (author), Dooms, Bram (author), Van Itterbeeck, Petra (author)
Although there has been extensive research and several demonstration projects in Belgium and abroad, the use of recycled aggregates in concrete is still limited in practice. Several barriers were identified: lack of practical experience, limiting standards and the need for specific quality assurance. The paper describes recent developments in...
conference paper 2017
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Bougrain, Frédéric (author)
According to the European Commission website, construction and demolition waste (CDW - consisting of materials such as concrete, bricks, gypsum, wood, glass, metals, asbestos, excavated soil…) accounts for approximately 25% - 30% of all waste generated in the EU. To move towards a recycling society, various policies have been launched by...
conference paper 2017
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Vrijders, Jeroen (author), Wastiels, Lisa (author)
The use of recycled aggregates in new structural concrete is generally considered as a measure for lowering the environmental impact of concrete. Existing literature considers transport distances and the final performance of the concrete (linked to its composition) as main influencing factors to evaluate the environmental burdens or gains when...
conference paper 2017
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Shamsutdinova, G. (author), Hendriks, M.A.N. (author), Jacobsen, S. (author)
conference paper 2016
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Magan, Christopher (author), Coenders, J.L. (author), Huijben, F (author), Nijsse, R. (author), van der Horst, A.Q.C. (author)
This paper presents a design for a topology-optimised concrete floor slab, of which the structural optimisation process is guided by manufacturability constraints from a vacuumatic formwork. Ihe design has been obtained using an open-source, tliree-dimensional topology optimisation algorithm. Traditional floor systems are cost-optimised but can...
conference paper 2016
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Koekkoek, R.T. (author), Lantsoght, E.O.L. (author), Yang, Y. (author), Boer, A. de (author), Hordijk, D.A. (author)
As the bridge stock in The Netherlands and Europe is ageing, various methods to analyse existing bridges are bemg studied. Proof loading of bridges is an option to study the capacity when crucial information about the structure is lacking. This information could be related to the material (for example, the effect of alkali-silica reaction on the...
conference paper 2016
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Vegt, I. (author), Weerheijm, J. (author)
Dynamic tests demonstrate an extensive rate effect on the tensile strength as well as the post-peak behaviour beyond loading rates of about 50 GPa/s. One of the possible explanations for the observed rate effects on the fracture behaviour is enhanced resistance by moisture in the pores. To study the influence of the moisture content and pore...
conference paper 2016
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Mors, R.M. (author), Jonkers, H.M. (author)
conference paper 2015
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Stroeven, P. (author)
Path length measuring is a relevant engineering problem. Leonardo Da Vinci designed for the military appropriate equipment, the podometer, to do so. Modern equipment such as step meters and map meters are quite similar to Da Vinci?s design, despite geometrical statistical - stereological - methods based on theorems of Cauchy and Buffon that were...
conference paper 2015
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De Boer, A. (author), Hendriks, M.A.N. (author), Van der Veen, C. (author), Belletti, B. (author)
conference paper 2015
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Schipper, H.R. (author), Eigenraam, P. (author), Grünewald, S. (author), Soru, M. (author), Nap, P. (author), Van Overveld, B. (author), Vermeulen, J. (author)
The production of architectural elements with complex geometry is challenging for concrete manufacturers. Computer-numerically-controlled (CNC) milled foam moulds have been applied frequently in the last decades, resulting in good aesthetical performance. However, still the costs are high and a large volume of waste is produced. This paper...
conference paper 2015
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Savija, B. (author), Schlangen, E. (author)
Concrete structures are commonly cracked when in service. To overcome issues arising from cracking, self-healing concrete is being developed. Together with the development of the material, techniques to verify and quantify self-healing are being developed. A number of destructive techniques have been used in the past. It would be beneficial to...
conference paper 2015
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Sierra Beltran, M.G. (author), Jonkers, H.M. (author), Mors, R.M. (author), Mera-Ortiz, W. (author)
This paper describes the first field application of self-healing concrete with alkaliphilic spore-forming bacteria and reinforced with natural fibres. The application took place in the highlands in Ecuador in July 2014. The concrete was cast as linings for an irrigation canal that transports water from glaciers in the Andean mountains to...
conference paper 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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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
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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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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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Van Breugel, K. (author), Van Tuan, N. (author)
conference paper 2014
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Van 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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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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