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Walraven, J.C. (author), Dieteren, Gerrie (author)For the assessment of concrete structures in the new fib Model Code 2020 (fib MC 2020), three categories are distinguished: (1) the residual capacity of existing structures without damage, (2) the residual capacity of structures suffering deterioration, and (3) the residual capacity of structures with noncompliant details. In the accompanying...journal article 2023
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Walraven, J.C. (author), Dieteren, Gerrie (author)Existing structures often no longer meet the demands formulated in contemporary design codes with respect to structural safety and serviceability. This occurs, for instance, if the loads on existing structures, like traffic loads on bridges, are larger than assumed in the original design. A second potential reason is that structures are...journal article 2023
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Amir, Sana (author), van der Veen, C. (author), Walraven, J.C. (author), de Boer, Ane (author)A large number of bridges in the Netherlands have transversely post tensioned deck slabs cast in-situ between flanges of precast girders and were found to be critical in shear when evaluated by Eurocode 2. To investigate the bearing (punching shear) capacity of such bridges, a 1:2 scale bridge model was constructed in the laboratory and...conference paper 2023
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Kamat, Ameya (author), Abbas, Yawar (author), Blagojević, Andrija (author), van Casteren, Toine (author), Walraven, Joost (author)Service life of concrete infrastructure is severely compromised because of chloride-induced corrosion and measuring the chloride content is crucial to determine the remaining service life. DuraCrete provides a chloride ingress model based on Fick’s 2nd law. Although the diffusion coefficient is modelled as a time-dependent variable, the...conference paper 2021
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Kamat, Ameya (author), Abbas, Yawar (author), Blagojevic, Andrija (author), van Casteren, Toine (author), Walraven, J.C. (author)Service life of concrete infrastructure is severely compromised because of chloride-induced corrosion and measuring the chloride content is crucial to determine the remaining service life. DuraCrete provides a chloride ingress model based on Fick’s 2nd law. Although the diffusion coefficient is modelled as a time-dependent variable, the...conference paper 2021
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Walraven, J.C. (author), Droogné, Didier (author), Grunewald, S. (author), Taerwe, Luc (author), Cotovanu, Bogdan (author), Rovers, John (author)An investigation is carried out into the applicability of self-compacting high-performance fiber concrete (HPFC) in foundations. A concrete mixture has been designed with a concrete cube strength of about 110 MPa. The concrete contains 60 kg/m<sup>3</sup> steel fibers. The properties of the HPFC developed are very suitable for structural...journal article 2021
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Grunewald, S. (author), Cotovanu, Bogdan (author), Rovers, John (author), Walraven, J.C. (author), Taerwe, Luc (author)An investigation was executed into the applicability of self-compacting high performance fiber concrete in foundations. The applied concrete has a concrete cube strength of about 110 MPa and contains 60 kg/m<sup>3</sup> hooked-end steel fibers (<i>L</i><sub><i>F</i></sub> = 30 mm, <i>D</i><sub><i>F</i></sub> = 0.38 mm). This publication consists...journal article 2021
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Blagojevic, A. (author), Koleva, D.A. (author), Walraven, J.C. (author)Chloride-induced corrosion of steel reinforcement is one of the major threats to durability of reinforced concrete structures in aggressive environmental conditions. When the steel reinforcement starts to corrode, structures gradually lose integrity and service life is shortened. Cracks are inevitable in practice and they facilitate ingress of...conference paper 2014
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Grunewald, S. (author), Shionaga, R. (author), Walraven, J.C. (author)Floor panels produced with traditionally vibrated concrete are relatively thick due to the need to reinforce concrete and consequently, heavy. Without the need to place rebars in panels and by applying self-compacting fibre reinforced concrete (SCFRC) the production process becomes more efficient. Fibres improve the performance of concrete by...conference paper 2013
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Sarkhosh, R. (author), Walraven, J.C. (author), Den Uijl, J.A. (author), Braam, C.R. (author)Long-term tests on large-scale concrete beams without shear reinforcement, which are tested for more than two years under sustained loading close to the ultimate shear capacity (load ratio ranging from 87% to 95%) under climate controlled condition, show that sustained loading has no significant effect on the shear capacity. Although many...conference paper 2013
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Lantsoght, E.O.L. (author), Van der Veen, C. (author), Walraven, J.C. (author)Previous experimental research at Delft University of Technology indicated an increased shear capacity of slabs under concentrated loads as a function of decreasing distance to the adjacent line support. Expressions have been derived for this increase, including the definition of an appropriate effective width. However, it is unknown if the...conference paper 2013
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Lantsoght, E.O.L. (author), Van der Veen, C. (author), Walraven, J.C. (author), De Boer, A. (author)Upon assessment of existing reinforced concrete short-span solid slab bridges according to the recently implemented Eurocodes that include more conservative shear capacity provisions and heavier axle loads, a number of these structures were found to be shear-critical. The results from recent experimental research on the shear capacity of slabs...journal article 2013
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Sarkhosh, R. (author), Walraven, J.C. (author), Den Uijl, J.A. (author)Under sustained loading, the propagation of cracks in concrete is assumed to be related to the elastic deformation, material parameters and time. Based on the fictitious crack model (FCM), a finite element method is proposed to explain the behavior of cracks in time using current constitutive relations to approximate the time-dependent crack...conference paper 2013
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Fennis-Huijben, S.A.A.M. (author), Grunewald, S. (author), Walraven, J.C. (author), Den Uijl, J.A. (author)Optimizing concrete mixtures with regard to cement content is one of the most important solutions in sustainable concrete design. Workability o f these low cement content or ecological mixtures is very important. Eleven mortar mixtures are presented, which show how a higher packing density can be used to obtain mixtures that require less water....conference paper 2012
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Fennis, S.A.A.M. (author), Walraven, J.C. (author)The annual production of Portland cement, estimated at 3.4 billion tons in 2011, is responsible for about 7% of the total worldwide CO2-emission. To reduce this environmental impact it is important to use innovative technologies for the design of concrete structures and mixtures. In this paper, it is shown how particle packing technology can be...journal article 2012
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Amir, S. (author), Van der Veen, C. (author), Walraven, J.C. (author)In the Netherlands, there is a need to determine the capacity of bridge decks as a large number of them were built back in the 60’s and 70’s. Since then, not only a lot of additional safety requirements have been incorporated into the modern codes but the traffic flow has also increased drastically. The current research deals with this question...conference paper 2012
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Grünewald, S. (author), Janssen, B. (author), Schipper, H.R. (author), Vollers, K.J. (author), Walraven, J.C. (author)This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place...conference paper 2012
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Walraven, J.C. (author)High performance fiber reinforced concrete is developing quickly to a modern structural material with a high potential. As for instance testified by the recent symposium on HPFRC in Kassel, Germany (April 2008) the number of structural applications increases. At this moment studies are carried out with the aim to come to an international...journal article 2009
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Midorikawa, T. (author), Pelova, G.I. (author), Walraven, J.C. (author)Self-Compacting Concrete is a relatively new type of concrete. Up to now only a few models have been developed to explain its physical behaviour, like the Water Layer Model and the Excess Paste Model. In this paper, the difference between the Water Layer Model and the Excess Paste Model is highlighted, and the validity of the Water Layer Model...journal article 2009
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Yang, Y. (author), Walraven, J.C. (author), den Uijl, J.A. (author)In this paper a brief overview on the effect of tension stiffening in normal strength concrete and High Performance Fiber Concrete (HPFC) is given. On the basis of an existing model, several simplifications are proposed to describe the post-cracking performance of HPFC, and a simplified model for practical application is developed. This model is...journal article 2009
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