Searched for: department%3A%22Structural%255C%252BEngineering%22
(81 - 100 of 107)
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Stroeven, P. (author), He, H. (author)This paper presents some evidence of the impact of the Brazil nut effect (BNE) on concrete’s particulate structure on meso-level (aggregate) as well as on micro-level (cement paste). BNE is associated with long-range size segregation in particle mixtures due to vibration in slurry state of concrete, both near boundaries and in bulk. Presented...journal article 2012
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He, H. (author), Le, N.L.B. (author), Stroeven, P. (author)Experimental approaches in concrete technology are time-consuming, laborious and thus expensive. Developments in computer facilities render possible nowadays realistically simulating the particulate structure and microstructure of cementitious materials. For that purpose, discrete element methods (DEM) are required because of more correctly...journal article 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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Huan He, H. (author), Le, N.L.B. (author), Stroeven, P. (author)Durability of concrete in engineering structures is becoming more and more of a major problem. Research into such problems is complicated and expensive, however. Developments in computer technology make it possible nowadays realistically simulating cementitious materials and studying its pore network structure. In this paper use is made of the...journal article 2012
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Xuan, D. (author), Houben, L.J.M. (author), Molenaar, A.A.A. (author), Shui, Z. (author)One of high efficient ways to reuse the recycled construction and demolition waste (CDW) is to consider it as a road base material. The recycled CDW however is mainly a mix of recycled masonry and concrete with a wide variation in composition. This results that the mechanical properties of cement treated demolition waste are not only determined...journal article 2012
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Hu, J. (author), Koleva, D.A. (author), Van Breugel, K. (author)This study presents the results from a preliminary investigation on the corrosion behavior of carbon steel in cement extract (CE) in the presence of very low concentration (0.0024 wt. %) polymeric nano-aggregates (PEO113-b-PS780 vesicles). Two types of vesicles were studied: vesicles with a CaO-containing core and vesicles with an “empty” core....journal article 2012
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Han, B. (author), Yang, Z. (author), Shi, X. (author), Yu, X. (author)This paper preliminarily investigates the general transport properties (i.e., water sorptivity, water permeability, and gas permeability) of carbon-nanotube/cement composites. Carboxyl multi-walled carbon nanotubes (MWNTs) are dispersed into cement mortar to fabricate the carbon nanotubes (CNTs) reinforced cement-based composites by applying...journal article 2012
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Kuijvenhoven, M. (author), Hoogenboom, P.C.J. (author)In this paper a general design method is described that can significantly reduce the effort needed for form finding grid shells consisting of flexible members. This design method is based on particle-spring models for simulating the behaviour of a grid shell during construction. Hereby, the stress limitations that follow from the material...journal article 2012
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Hoogenboom, P.C.J. (author)Finds and ideas with a surprising element similar to the playful inventions of Heron of Alexandria, after whom this journal is named.journal article 2012
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Van Koten, H. (author), Hoogenboom, P.C.J. (author)Rotating or pulsing machines are often placed on concrete foundations supported by soil. The machines cause vibrations in the building and in the surrounding soil. This paper provides information, formulas and calculation examples to predict these vibrations. The formulas have been experimentally tested for both soil foundations and pile...journal article 2012
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Hu, J. (author), Koleva, D.A. (author), Van Breugel, K. (author)This study reports on the effect of admixed polyethylene oxide-b-polystyrene (PEO113-b-PS70)micelles on corrosion behavior of reinforced mortar. The electrochemical measurement shows that the corrosion performance of the reinforcing steel was not significantly improved. However, surface analysis and microstructural investigation at the steel...journal article 2012
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Koleva, D.A. (author), Van Breugel, K. (author)Corrosion in reinforced concrete is a major and costly concern, arising from the higher complexity of involved phenomena on different levels of material science (e.g. electrochemistry, concrete material science) and material properties (macro/micro/ nano). Reinforced cement-based systems (e.g. reinforced mortar and concrete) are multi-phase...journal article 2012
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Ma, Y. (author), Hu, J. (author), Ye, G. (author)Alkali-activated fly ash (AAF) is a promising material that exhibits comparable material properties as cement-based materials but with much less CO2 emission. In the present work, the effect of activating solution (SiO2 and Na2O content) on the performance of AAF was studied by means of isothermal calorimetry and X-ray diffraction analysis....journal article 2012
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Izzuddin, B.A. (author), Pereira, M.F. (author), Kuhlmann, U. (author), Rolle, L. (author), Vrouwenvelder, A.C.W.M. (author), Leira, B.J. (author)Risk assessment is a requirement for robustness design of high consequence class structures, yet very little guidance is offered in practice for performing this type of assessment. This paper demonstrates the application of the probabilistic risk assessment framework arising from COST Action TU0601 to multi-storey buildings subject to extr eme...journal article 2012
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Maljaars, J. (author), Steenbergen, R. (author), Abspoel, L. (author), Kolstein, M.H. (author)The assessment of the structural safety of existing br idges and viaducts becomes increasingly important in many countries owing to an increase in traffic loads. Most existing standards, however, are developed for the design of new structures. For this reason, an assessment method for determining the actual safety level of highway bridges and...journal article 2012
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Xia, H. (author)PhD EU project poster: C2CA.journal article 2012
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Koleva, D.A. (author), Van Breugel, K. (author)Corrosion in reinforced concrete is a major and costly concern, arising from the higher complexity of involved phenomena on different levels of material science (e.g. electrochemistry, concrete material science) and material properties (macro/micro/ nano). Reinforced cement-based systems (e.g. reinforced mortar and concrete) are multi-phase...journal article 2011
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Zhang, Q. (author), Ye, G. (author)When a concrete structure is exposed to high temperature, the mechanical damage and chemical transformation take place simultaneously, which will change the microstructure of material. On the other hand, the mechanical properties and transport properties depend on the development of microstructure of cement paste. In order to study the...journal article 2011
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Weijermars, R. (author)Global trends – past and future – of world natural gas consumption, production, reserves, and prices are highlighted here analyzing the BP Statistical Review of World Energy 2011, the BP Energy Outlook 2011, and the latest natural gas data from the world’s major energy agencies. Growing demand and declining gas-reserve- replacement ratios...journal article 2011
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Wiktor, V. (author), Jonkers, H.M. (author)La formation d’un réseau continu de fissures contribue à l’augmentation de la perméabilité du béton, réduisant ainsi de manière importante sa résistance à l’attaque d’agents agressifs dissous dans l’eau. Afin d’augmenter la capacité de cicatrisation autogène du béton, certains agents cicatrisants spécifiques peuvent être incorporés dans la...journal article 2011
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