Searched for: faculty%3A%22Civil%255C%252BEngineering%255C%252Band%255C%252BGeosciences%22
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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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- Blagojevic, A. (author), Fennis-Huijben, S.A.A.M. (author), Walraven, J.C. (author) conference paper 2012
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Lantsoght, E.O.L. (author), Van der Veen, C. (author), Walraven, J.C. (author)Poster. In the Netherlands, 60% of the existing bridges were built before 1975, while the traffic volumes and loads have increased over time. The results of a first assessment of the existing bridges showed that particularly the shear capacity of reinforced concrete solid slab bridges is often lower than the resulting shear stresses due to dead...journal article 2012
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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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Sarkhosh, R. (author), den Uijl, J.A. (author), Braam, C.R. (author), Walraven, J.C. (author)Concrete is one of the oldest and most widely used construction materials in the world and possesses many unique qualities such as versatility, aesthetic appeal, eco-friendliness, cost-effectiveness and availability. Increasingly, architects and engineers are making concrete their material of choice. Its strength, durability and natural thermal...report 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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Grunewald, 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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Lantsoght, E.O.L. (author), Van der Veen, C. (author), Walraven, J.C. (author), De Boer, A. (author)Several existing reinforced concrete solid slab bridges in the Netherlands do not meet the criteria for shear when calculated according to the recently implemented Eurocodes. The shear capacity is assessed by comparing the design beam shear resistance to the design value of the applied shear force due to the dead load, permanent load and live...conference paper 2012
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- Walraven, J.C. (author) public lecture 2011
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Sarkhosh, R. (author), den Uijl, J.A. (author), Braam, C.R. (author), Walraven, J.C. (author)Concrete is a multiphase granular material consisting of aggregate particles of various sizes and irregular shape, embedded in hardened cement paste. The physicochemical processes during the hardening of the cement cause air voids, micro cracks and interfacial bond micro cracks. As a consequence of this heterogeneous structure, concrete displays...report 2010
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Sarkhosh, R. (author), den Uijl, J.A. (author), Braam, C.R. (author), Walraven, J.C. (author)Concrete is a multiphase granular material consisting of aggregate particles of various sizes and irregular shape, embedded in hardened cement paste. The physicochemical processes during the hardening of the cement cause air voids, micro cracks and interfacial bond micro cracks. As a consequence of this heterogeneous structure, concrete displays...report 2010
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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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Grünewald, S. (author), Walraven, J.C. (author)The development of self-compacting concrete (SCC) was an important step towards efficiency at building sites, rationally producing prefabricated concrete elements, better working conditions and improved quality and appearance of concrete structures. By adding fibres to SCC bar reinforcement can be replaced and the performance of concrete...journal article 2009
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Fennis, S.A.A.M. (author), Walraven, J.C. (author), Den Uijl, J.A. (author)Ecological concrete can be designed by replacing cement with fillers. With low amounts of cement it becomes increasingly important to control the water demand of concrete mixtures. In this paper a cyclic design method based on particle packing is presented and evaluated on the basis of experiments on cement pastes combined with quartz powder....journal article 2009
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Schumacher, P. (author), Walraven, J.C. (author), Den Uijl, J.A. (author), Bigaj-van Vliet, A. (author)Steel fibres are known to enhance the toughness of concrete in compression and in tension. Steel fibres also improve the bond properties between concrete matrix and reinforcing steel bars. In order to investigate the effect of steel fibres on the rotation capacity of reinforced concrete members, four simply supported beams were loaded in three...journal article 2009
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Bigaj, A. (author), Walraven, J.C. (author)Reasons for size dependence of rotation capacity of plastic hinges are discussed. The increase of ductility with decreasing member size is interpreted from the viewpoint of fracture mechanics of concrete. The results of the introductory test series on simply supported slender beams loaded in three-point bending are discussed. A new model for the...conference paper 2002
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