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Nedeljkovic, M. (author), Šavija, B. (author), Zuo, Y. (author), Lukovic, M. (author), Ye, G. (author)
The aim of this paper was to investigate the effect of natural carbonation on the pore structure, and elastic modulus (E-m) of alkali-activated fly ash (FA) and ground granulated blast furnace slag (GBFS) pastes after one year of exposure in the natural laboratory conditions. The chemical changes due to carbonation were examined by X-ray...
article 2018
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Visser, J.H.M. (author)
The current theory of ASR gel formation in concrete between silicic acid anions with cations and is unable to explain the differences in concentration required for gel formation between e.g. potassium and sodium or the effect of calcium on the gel formation. In this paper, a new gelation mechanism is explained by means of a condensation between...
article 2018
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van der Knaap, L.P.M. (author)
Bij metingen in de glastuinbouwpraktijk blijkt dat er na de jaarlijkse reiniging van het kasdek ongeveer 5% meer lichttransmissie is. En laat licht nu net de belangrijkste groeifactor zijn. Daarbij komt dat onvoldoende reiniging zorgt voor een versnelde veroudering van het kasdek. Denk bijvoorbeeld aan vuilophoping tussen de strips en het glas....
article 2018
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Borsje, H. (author), Swinkels, M. (author), Berg, N. (author)
De Afsluitdijk is op dit moment ruim tachtig jaar oud en heeft ons al die jaren goed tegen de krachten en invloeden van het zeewater beschermd (foto 1 en 2). Rijkswaterstaat gaat de Afsluitdijk nu een grote opknapbeurt geven, zodat hij tot ten minste 2050 mee kan. De dijk wordt zodanig versterkt dat hij bestand is tegen het stijgende zeewater....
article 2018
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Pahlavan, P.L. (author), Zhang, F. (author), Blacquière, G. (author), Yang, Y. (author), Hordijk, D. (author)
Interaction of ultrasonic waves with partially-closed surface-breaking cracks in concrete structures has been studied. Measurements have been conducted on a reinforced concrete beam containing various mechanical-load-induced cracks and compared with the baseline measurements at those locations. Influence of crack width, incident angle of waves...
article 2018
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Gómez, S.S. (author), Metrikine, A. (author), Carboni, B. (author), Lacarbonara, W. (author)
In this paper, identification of energy dissipation in the joints of a lab-scale structure is accomplished. The identification is carried out by means of an energy flow analysis and experimental data. The devised procedure enables to formulate an energy balance in the vicinity of the joints to obtain local energy dissipation. In this paper, a...
article 2018
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van Hees, R.P.J. (author), Veiga, R. (author), Slizkova, Z. (author)
The paper addresses the consolidation of
article 2017
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Rózsás, Á. (author), Mogyorósi, Z. (author)
In structural reliability the dependence structure between random variables is almost exclusively modeled by Gauss (normal or Gaussian) copula; however, this implicit assumption is typically not corroborated. This paper is focusing on time-variant reliability problems with continuous stochastic processes, which are collection of dependent random...
article 2017
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Souza, L.M.S. (author), Polder, R.B. (author), Çopuroğlu, O. (author)
Alkali–silica reaction (ASR) affects numerous concrete structures worldwide. However, the intervention options for ASR in existing structures are limited. Lithium is proposed to suppress expansion. In this paper, an investigation on two-chamber lithium migration as treatment against ASR is presented. First, the influence of different levels of...
article 2017
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Ritzen, M.J. (author), Vroon, Z.A.E.P. (author), Rovers, R. (author), Geurts, C.P.W. (author)
Backside ventilation is one of the most common passive cooling methods of PV modules in the built environment, but might be under constraint when integrating PV in the building envelope. To investigate the short and long term effect of backside ventilation on Building Integrated PV (BIPV) performance and lifespan, a comparative BIPV field test...
article 2017
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Luiten, G.T. (author), Peelen, W.H.A. (author), Vega, E. (author)
Het aantal projecten in de civiele infrastructuur waarin het gedrag van constructies gemonitord wordt, groeit langzaam maar zeker. Dit zijn echter nog vaak unieke projecten, gebaseerd op het enthousiasme van pioniers in hun organisatie. Het is voor de meeste organisaties nog onduidelijk of monitoren voldoende toegevoegde waarde heeft en hoe ze...
article 2017
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Angst, U.M. (author), Geiker, M.R. (author), Michel, A. (author), Gehlen, C. (author), Wong, H. (author), Isgor, O.B. (author), Elsener, B. (author), Hansson, C.M. (author), Francois, R. (author), Hornbostel, K. (author), Polder, R.B. (author), Alonso, M.C. (author), Sanchez, M. (author), Correia, M.J. (author), Criado, M. (author), Sagues, A. (author), Buenfeld, N. (author)
Although the steel–concrete interface (SCI) is widely recognized to influence the durability of reinforced concrete, a systematic overview and detailed documentation of the various aspects of the SCI are lacking. In this paper, we compiled a comprehensive list of possible local characteristics at the SCI and reviewed available information...
article 2017
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Ritzen, M.J. (author), Vroon, Z.A.E.P. (author), Rovers, R. (author), Lupíšek, A. (author), Geurts, C.P.W. (author)
Building Integrated PV (BIPV) is considered as a key development for successful deployment of PV in the built environment. However, the effect of PV integration on environmental impact is not fully understood. In this study a single indicator for environmental impact assessment of BIPV is investigated in the Netherlands. A BIPV rooftop with 24...
article 2017
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Sleiman, H.A. (author), Hempel, S. (author), Traversari, A.A.L. (author), Bruinenberg, S. (author)
Energy efficiency in buildings is one of the main goals of many governmental policies due to their high impact on the carbon dioxide emissions in Europe. One of these targets is to reduce the energy consumption in healthcare buildings, which are known to be among the most energy-demanding building types. Although design decisions made at early...
article 2017
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Voormeeren, L.O. (author), van der Meer, F.P. (author), Maljaars, J. (author), Sluys, L.J. (author)
The last decade has seen a growing interest in cohesive zone models for fatigue applications. These cohesive zone models often suffer from a lack of generality and applying them typically requires calibrating a large number of model-specific parameters. To improve on these issues a new method has been proposed in this paper based on the Thick...
article 2017
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't Hart, H. (author)
De data voor het berekenen van ontwerpbelastingen van kasconstructies zullen in 2018 beschikbaar komen in digitale normkaarten, zei Hans 't Hart van TNO op het Future Trends & Innovations in Horticulture Technology event van 12 december. Volgens Maurice Hartman van Technokas biedt de GPS-toolbox, waarmee de data worden verzameld, voordelen voor...
article 2017
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Borsoi, G. (author), Lubelli, B.A. (author), van Hees, R.P.J. (author), Silva, A.S. (author)
Surface consolidation is a common practice in the conservation of the built heritage. However, the effectiveness of consolidation of calcareous materials is often doubtful, due to the lack of effective and compatible consolidation products. Dispersions of calcium hydroxide nanoparticles in alcohol, the so-called nanolimes, can recover the...
article 2017
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Kosgodagan-Dalla Torre, A. (author), Yeung, T.G. (author), Morales-Nápoles, O. (author), Castanier, B. (author), Maljaars, J. (author), Courage, W. (author)
Modeling the stochastic evolution of a large-scale fleet or network generally proves to be challenging. This difficulty may be compounded through complex relationships between various assets in the network. Although a great number of probabilistic graph-based models (e.g., Bayesian networks) have been developed recently to describe the behavior...
article 2017
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Bronkhorst, A.J. (author), Geurts, C.P.W. (author), van Bentum, C.A. (author), van der Knaap, L.P.M. (author), Pertermann, I. (author)
An atmospheric boundary layer wind tunnel study was performed to determine the overall horizontal wind load on multi-span duo-pitch greenhouses. The results of this study are intended for the stability design of inflexible Gladding system greenhouses (designated as Class A in EN 13031-1) with roof pitch angles of 23-24' and ridge heights of 7.5...
article 2017
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Geurts, C.P.W. (author)
Voor de bevestiging van dakbedekkingen worden in Nederland specifieke rekenregels gegeven via NEN 6707 en NPR 6708. Dit betreft zowel de regels voor de bepaling van de windbelasting als methodes om de sterkte te bepalen. Deze regels zijn voor zowel hellende als platte daken afgeleid uit resultaten van onderzoek dat in de laatste decennia in...
article 2017
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