Searched for: subject:"2015%5C%2BUrbanisation"
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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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Rossi, E. (author), Polder, R.B. (author), Copuroglu, O. (author), Nijland, T.G. (author), Saviuja, B. (author)
Although reinforcement corrosion is a well-known issue, which are the locations of the steel/concrete interface most sensitive to pitting corrosion is still an unclear issue. In this study, X-ray computed tomography is used to characterize eight 20-years-old reinforced concrete cores naturally deteriorated due to chloride-induced corrosion. The...
article 2020
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Russo, N. (author), Rossi, E. (author), Garcia, S. (author), Bijleveld, J. (author), Nijland, T.G. (author), Polder, R.B. (author), Lollini, F. (author)
Service life of reinforced concrete structures is usually limited to initiation of corrosion, whilst in practice corrosion in many structures is already in the propagation stage. To better understand the processes that leads to the cracking and detachment of concrete cover during this phase, the knowledge of corrosion products development in...
article 2020
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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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van der Wegen, G. (author), Lichtmans, M. (author), Polder, R.B. (author)
In der aktuellen Fassung der Betonnorm EN 206 wird ein deskriptives Konzept fr die Dauerhaftigkeit des Betons ver-wendet, wobei der Nachweis der Dauerhaftigkeit liber die Einhaltung der Grenzwerte des Regelwerks bezgIich Beton-eigenschaften und Betonzusammensetzung gefiihrt wird. Dabei wird aber der Einfluss der jeweiligen Zementart oder des...
article 2018
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Souza, L.M.S. (author), Polder, R.B. (author), Copuroglu, O. (author)
Electrochemical lithium migration has been suggested as repair technique for alkali-silica reaction affected concrete structure. In this method, an electric field is used to transport lithium into the material. Current studies have used anolyte solutions with various lithium salts at different concentrations. However, little has been said on the...
article 2018
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Polder, R. (author), Peelen, W. (author)
This paper presents an overview of 30 years' experience with cathodic protection of steel in concrete in The Netherlands. Principles and practical aspects of CP and its design and installation are presented. Three phases have passed from the late 1980s until present: pioneering, development and maturity. In the first period CP was mainly applied...
conference paper 2018
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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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Polder, R.B. (author), van Put, M. (author), Peelen, W.H.A. (author)
Testing for the chloride threshold (also called critical chloride content) for corrosion initiation of steel in concrete has been found difficult and, at best, time consuming. Nevertheless, the chloride threshold is an important parameter in service life design of new structures and for evaluation of the remaining service life of existing...
conference paper 2017
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Souza, L.M.S. (author), Polder, R.B. (author), Copuroglu, O. (author)
The currently available treatment techniques for concrete structures affected by alkali-silica reaction (ASR) are limited and electrochemical lithium migration has been proposed as an alternative. Lithium compounds have shown to have beneficial effects on ASR expansion when used as admixtures to fresh concrete. During the electrochemical...
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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Polder, R.B. (author), Boutz, M.M.R. (author), Ottelé, M. (author)
Asset managers would benefit from knowing when to expect corrosion initiation in a particular reinforced concrete structure. However, accepted approaches to test existing structures for the remaining time to corrosion initiation are lacking. This paper proposes such an approach, based on experience in the field and additional considerations....
conference paper 2017
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Bleijenberg, A.N. (author), Maljaars, J. (author), Polder, R.B. (author), Steenbergen, R.D.J.M. (author), Vervuurt, A.H.J.M. (author)
In theorie naderen veel bruggen en viaducten hun einde levensduur, maar de soep wordt niet zo heet gegeten als zij wordt opge-diend. Veel kunstwerken bezitten verborgen krachten. Toch is het nodig alle over-spanningen goed in kaart te brengen en kennis over dit onderwerp met elkaar te delen en/of op te bouwen
article 2017
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Yang, Z. (author), Polder, R. (author), Mol, J.M.C. (author), Andrade, C. (author)
Two modified Mg-Al hydrotalcites (MHTs), (MHT-pAB and MHT-NO2) were incorporated into mortar (with different w/c ratios) in two different ways: (1) as one of the mixing components in bulk mortar; (2) as part of cement paste coating of the reinforcing steel. Accelerated chloride migration, cyclic wetting-drying and diffusion tests were performed...
article 2017
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van Breugel, K. (author), Polder, R.B. (author), de Rooij, M.R. (author)
For many concrete infrastructural works a service life of 80, 100 or 200 years is required. To convince owners and authorities that these requirements can be met probability-based models for service life predictions have been developed. These models are based on theoretical and experimental laboratory studies. Many of these models focus on the...
conference paper 2017
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Holthuizen, P.E. (author), Çopuroglu, O. (author), Polder, R.B. (author)
In the Netherlands civil engineering structures, such as overpasses, bridges and tunnels are generally built using blast furnace slag cement (BFSC, CEM III/B) concrete, because of its high resistance against chloride penetration. Although the Dutch experience regarding durability performance of BFSC concrete has been remarkably good, its...
conference paper 2017
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Yang, Z. (author), Polder, R. (author), Mol, J.M.C. (author)
Owing to the unique molecular structure and high ion exchange capacity, hydrotalcites are believed to have a potential to be modified and tailor-made as an active corrosion protective component of reinforced concrete. In this paper, two types of modified hydrotalcites (MHT-pAB and MHT-NO2) were tested both in alkaline solution and mortar for...
article 2017
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Pacheco, J. (author), Polder, R.B. (author)
Chloride induced reinforcement corrosion is the predominant degradation mechanism
article 2016
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Beushausen, H. (author), Alexander, M.G. (author), Basheer, M. (author), Baroghel-Bouny, V. (author), D’Andréa, R. (author), Gonçalves, A. (author), Gulikers, J. (author), Jacobs, F. (author), Khrapko, M. (author), Monteiro, A.V. (author), Nanukuttan, S.V. (author), Otieno, M. (author), Polder, R. (author), Torrent, R. (author)
In general, design approaches for durability can be divided into prescriptive design
conference paper 2016
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Geiker, M.R. (author), Polder, R.B. (author)
This paper, describes experiments that form the basis of an invention that aims
article 2016
Searched for: subject:"2015%5C%2BUrbanisation"
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