Searched for: subject%3A%22Concrete%22
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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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Zhang, C. (author), Hu, M. (author), di Maio, F. (author), Sprecher, B. (author), Yang, X. (author), Tukker, A. (author)
article 2022
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Heinemann, H.A. (author)
Existing precast concrete structures are currently being reevaluated more frequently. Aiming to reduce the use of raw material and reduce CO2 emissions pilot projects are being carried out to re‐use precast concrete elements including bridges. Challenges are to demonstrate the structural safety of re‐used elements under present day codes and the...
conference paper 2022
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Rozsas, A. (author), Slobbe, A. (author), Martini, G. (author), Jansen, R. (author)
This paper describes a static diagnostic load testing and measurement campaign of a reinforced concrete road bridge in Amsterdam. We consider 29 vertical translation sensors and 37 strain sensors. Multiple Bayesian parameter estima tions are performed to estimate two structural and two load parameters of a three-dimensional finite element (FE)...
article 2022
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Zhang, C. (author), Hu, M. (author), Sprecher, B. (author), Yang, X. (author), Zhong, X. (author), Li, C. (author), Tukker, A. (author)
Building energy and construction and demolition waste (CDW) are highly relevant but intertwined issues for the transition towards a carbon-neutral and circular built environment. Ongoing energy renovation uses an increasing number of emerging materials that pose a challenge for recycling. As a response, a novel technological system has been...
article 2021
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Zhang, C. (author), Hu, M. (author), Laclau, B. (author), Garnesson, T. (author), Yang, X. (author), Li, C. (author), Tukker, A. (author)
article 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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Rossi, E. (author), Zhang, H. (author), Garcia, S.J. (author), Bijleveld, J. (author), Nijland, T.G. (author), Copuroglu, O. (author), Polder, R.B. (author), Savija, B. (author)
The elastic modulus of corrosion product (Ecp) has been reported with significant variations in the literature. This study aims to investigate the Ecp of naturally-generated chloride-induced corrosion products formed in different concrete mixes. Microstructural characterization was conducted through nano-indentation, electron microscopy and...
article 2021
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Zhang, C. (author), Hu, M. (author), Laclau, B. (author), Garnesson, T. (author), Yang, X. (author), Tukker, A. (author)
Buildings have become a major concern because of their high energy use and carbon emissions. Thus, a material efficient prefabricated concrete element (PCE) system was developed to incorporate construction and demolition waste as feedstock for residential building energy renovation by over-cladding the walls of old buildings. By conducting life...
article 2021
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Engen, M. (author), Hendriks, M.A.N. (author), Monti, G. (author), Allaix, D.L. (author)
When non-linear finite element analyses are used in design of new or assessment of existing concrete structures, one should account for the modelling uncertainty before conclusions are drawn based on the results. The present article describes the basis for how this topic is treated in the draft of fib Model Code 2020. There are two components of...
article 2021
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Zhang, C. (author), Hu, M. (author), Yang, X. (author), Miranda-Xicotencatl, B. (author), Sprecher, B. (author), di Maio, F. (author), Zhong, X. (author), Tukker, A. (author)
Urban mining from construction and demolition waste (CDW) is highly relevant for the circular economy ambitions of the European Union (EU). Given the large volumes involved, end-of-life (EoL) concrete is identified as one of the priority streams for CDW recycling in most EU countries, but it is currently largely downcycled or even landfilled....
article 2020
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Ozbek, A.S. (author), Pedersen, R.R. (author), Weerheijm, J. (author), van Breugel, K. (author)
This study presents the numerical analyses conducted to investigate the impact behavior of different porous concretes, which have also been cast and tested experimentally. For a realistic representation of the real porous concretes containing arbitrary shaped air pores, a mesh generation code was developed in which the aggregates in the mixtures...
article 2019
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Hansen, S.G. (author), Meinen, N.E. (author), Jørgensen, H.B. (author)
Assessment of the load‐carrying capacity of existing concrete structures is often based on the concrete compressive strength obtained from drilled cores. These cores are typically drilled perpendicular to the concrete surface, under the assumption that the mechanical properties of the concrete are isotropic. Recent studies however showed that...
conference paper 2019
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Slobbe, A. (author), Rózsás, Á. (author), Allaix, D.L. (author), bigaj-van Vliet, A. (author)
The objective of this paper is to explore the value of reliability-based nonlinear finite element analysis (NLFEA) over the currently available, standardized assessment methods. To our knowledge, no studies are available on this subject, and this paper provides a first insight into the value and reliability level of these assessment methods. The...
article 2019
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Slobbe, A.T. (author), Rozsas, A. (author), Allaix, D.L. (author), Bigaj-van Vliet, A.J. (author)
conference paper 2019
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Rossi, E. (author), Nijland, T.G. (author), Copuroglu, O. (author), Polder, R.B. (author), Savija, B. (author)
Although corrosion of reinforcement is a well-known issue for the construction industry, there are still open questions about some fundamentals of corrosion in reinforced concrete. These points include, among others, which are the most sensitive locations of the steel/concrete interface for pitting corrosion to initiate and to propagate. In this...
conference paper 2019
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Zhang, C. (author), Hu, M. (author), Dong, L. (author), Gebremariam, A. (author), Mirand-Xicotencatl, B. (author), di Maio, F. (author), Tukker, A. (author)
The increasing volume of Construction and demolition waste (CDW) associated with economic growth is posing challenges to the sustainable management of the built environment. The largest fraction of all the CDW generated in the member states of the European Union (EU) is End-of-life (EOL) concrete. The most widely applied method for EOL concrete...
article 2019
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Keulen, A. (author), van Zomeren, A. (author), Dijkstra, J.J. (author)
This study explores the leaching of oxyanionic metalloid species (As, Mo, Se, V and Cr) from alkali activated slag-fly ash materials (AAM), dependent on various mixture parameters i.e., activator molarity, slag-fly ash precursor/binder compositions, liquid to binder ratio, curing time and strength. The analyses focusses on the leaching of...
article 2018
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Pereira, L.F. (author), Weerheijm, J. (author), Sluys, L.J. (author)
Although many aspects of the fracturing process of concrete are now well understood and successfully simulated with various models, it is still very difficult to properly simulate the different failure mechanisms observed in a concrete structure induced by ballistic impact. In this paper, an enhanced version of the effective-rate-dependent...
article 2018
Searched for: subject%3A%22Concrete%22
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