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Nedeljkovic, M. (author), Mylonas, A. (author), Wiktor, V. (author), Schlangen, E. (author), Visser, J.H.M. (author)Fine recycled concrete aggregates (fRCA, 0–4 mm) are produced from demolished concrete structures and consist of natural aggregates and old cement mortar. The presence of old cement mortar has detrimental effect on the fresh properties and trength of new concrete. This study aims to investigate the working mechanism and effectiveness of...article 2022
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Nedeljkovic, M. (author), Visser, J.H.M. (author), Nijland, T.G. (author), Valcke, S.L.A. (author), Schlangen, E. (author)In the Netherlands, beside cement replacement with more green cement types, there is also an urgent need for alternative materials for natural sand in new concrete in order to make it circular. Furthermore, the recyclers have raised questions regarding upscaling and the potential of fine recycled concrete aggregates (fRCA) in structural concrete...conference paper 2021
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Nedeljkovic, M. (author), Visser, J.H.M. (author), Nijland, T.G. (author), Valcke, S.L.A. (author), Schlangen, E. (author)In circular concrete design, beside cement replacement with more environmentally friendly cement types, there is also an urgent need for sand replacement with fine recycled concrete aggregates (fRCA). The variations in physical and chemical properties of fRCA and lack of standards for their quality evaluation are the main reasons for not yet...article 2021
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Nedeljkovic, M. (author), Visser, J.H.M. (author), Savija, B. (author), Valcke, S.L.A. (author), Schlangen, E. (author)This paper discusses the state-of-the-art of the fine recycled concrete aggregates (fRCA), focusing on their physical and chemical properties, engineering properties and durability of concretes with fRCA. Based on the systematic review of the published literature, it is impossible to deduce without any further research the guidelines and tools...article 2021
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Xu, S. (author), Liu, X. (author), Tabaković, A. (author), Lin, P. (author), Zhang, Y. (author), Nahar, S. (author), Lommerts, B.J. (author), Schlangen, E. (author)Rejuvenator encapsulation technique showed great potential for extrinsic asphalt pavement damage healing. Once the capsules are embedded within asphalt pavement, the healing is activated on-demand via progressing microcrack. When the microcrack encounters the capsule, the fracture energy at the tip opens the capsule and releases the rejuvenator....article 2021
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Zhang, H. (author), Schlangen, E. (author), Savija, B. (author)Cement paste is the glue that holds concrete together and any improvements in material performance will come from its microstructure. For better understanding and predicting its elastic properties and fracture performance, more and more studies are carried out based on micromechanics simulations. However, the predicted results can be hardly...conference paper 2018
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Pacheco, J. (author), Savija, B. (author), Schlangen, E. (author), Polder, R.B. (author)The influence of concrete cracking upon reinforcement corrosion is complex. Cracks allow fast penetration of chlorides, potentially leading to a shorter initiation period of reinforcement corrosion. Structural regulations control acceptable crack width values based on the exposure class of the structure. These regulations are limited to crack...bookPart 2014
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Pacheco, J. (author), Šavija, B. (author), Schlangen, E. (author), Polder, R.B. (author)The durability of cracked reinforced concrete is a serious concern in the construction industry. Cracks represent fast routes for chloride penetration, which can result in reinforcement corrosion. Bending or tapered cracks have the characteristic of being wider at the surface and becoming narrower towards the reinforcement. In reinforced...article 2014
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Çopuroğlu, O. (author), Schlangen, E. (author), Nishiwaki, T. (author), van Tittelboom, K. (author), Snoeck, D. (author), de Belie, N. (author), de Rooij, M.R. (author)There are many techniques to study materials. In this chapter the focus ofbookPart 2013
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Agar-Ozbek, A.S. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)Porous concrete incorporates a high percentage of meso-size air voids that makes its mechanical characteristics remarkably different from normal concrete. A research project was undertaken to design a special type of porous concrete, that fractures into small fragments when exposed to impact loading while having sufficient static strength, to be...article 2013
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Ozbek, A.S.A. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)Porous concrete is used in many applications that require permeability, noise absorption or thermal insulation. However, its response under dynamic loading is generally not considered. Porous concrete has a characteristic of forming multiple cracks and subsequently fracturing into small fragments when exposed to impact loading. Therefore, with...conference paper 2013
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Agar Ozbek, A.S. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)Porous concrete is used as a construction material in various applications mainly as a permeable cementitious material. However, its response under impact loading is generally not considered. Due to the high percentage of its intentional meso-size air pores, porous concrete has a moderate static strength compared to normal concrete while its...article 2013
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Pacheco, J. (author), Çopuroǧlu, O. (author), Šavija, B. (author), Schlangen, E. (author), Polder, R.B. (author)Reinforcement corrosion is the most important deterioration mechanism in concrete infrastructure. Chlorides contained in saltwater or de-icing salts penetrate through the concrete cover activating corrosion. When left unattended, corrosion leads to cracking and spalling of concrete cover, reducing the structure's service life. The amount of...conference paper 2012
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Šavija, B. (author), Schlangen, E. (author), Pacheco, J. (author), Polder, R.B. (author)Reliable methods for controlled cracking of reinforced specimens in laboratory conditions are needed in order to experimentally study chloride ingress and reinforcement corrosion in cracks. In the paper, the Modified Wedge Splitting Test (MWST) for specimen cracking is presented. The setup is thoroughly explained, and the implications of...conference paper 2012
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Agar-Ozbek, A.S. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)In this study, an experimental configuration that reveals the dynamic response of porous concretes in a drop weight impact test was introduced. Through the measurement of particle velocity at the interface, between the impactor and the concrete target, the dynamic response was obtained in an easily applicable way. Laser Doppler velocimetry (LDV)...article 2012
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García, Á. (author), Schlangen, E. (author), van de Ven, M. (author), van Vliet, D. (author)The objective of this research is to examine the induction heating of mastic through the addition of electrically conductive fillers and fibers (graphite and steel wool), and to prove that this material can be healed with induction energy. The effect of fibers content, sand-bitumen ratio and the combination of fillers and fibers on the induction...article 2011
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García, A. (author), Schlangen, E. (author), van de Ven, M. (author), van Vliet, D. (author)It is well known that the healing rates of asphalt courses increase with the temperature. A new method, induction heating, is used in this paper to increase the lifetime of asphalt concrete pavements. Mastic will be first made electrically conductive by the addition of conductive fibers. Then it will be heated via induction energy. This will...article 2011
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Qian, S. (author), Zhou, J. (author), de Rooij, M.R. (author), Schlangen, E. (author), Ye, G. (author), van Breugel, K. (author), TNO Bouw en Ondergrond (author)The self-healing behavior of a series of pre-cracked fiber reinforced strain hardening cementitious composites incorporating blast furnace slag (BFS) and limestone powder (LP) with relatively high water/binder ratio is investigated in this paper, focusing on the recovery of its deflection capacity. Four-point bending tests are used to precrack...article 2009
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Koenders, E.A.B. (author), Schlangen, E. (author), Leegwater, G. (author), TNO Bouw en Ondergrond (author)The start of the chemical reaction between cement and water is the moment that concrete starts to develop its properties. More precisely, it is the paste that starts to generate a loadbearing microstructure that exhibits a certain number of mechanical properties. One of the properties generated during hardening is the so-called hardening...conference paper 2006
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Schlangen, E. (author), Leegwater, G. (author), Koenders, E.A.B. (author), TNO Bouw en Ondergrond (author)In order to be able to improve concrete modelling based on its constituent, more knowledge is needed about the material behaviour of these constituents. In this research the focus is on the behaviour of hardening concrete, therefore the properties of hardening cement are of most relevance. Information about cement paste behaviour can be used as...conference paper 2006
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