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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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- Slobbe, A.T. (author), Rozsas, A. (author), Allaix, D.L. (author), Bigaj-van Vliet, A.J. (author) conference paper 2019
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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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Slobbe, A. (author), Allaix, D.L. (author), Yang, Y. (author)Different analytical models exist to predict the shear strength of reinforced concrete members. Generally, each of these shear strength models consists of a formulation based on certain underlying theory and fitted model coefficients. The model fitting parameters are usually established from the comparison with test data. Hence, the predictive...conference paper 2017
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Yang, Z. (author), Fischer, H. (author), Polder, R.B. (author)In this paper, two types of modified hydrotalcites (MHT) were incorporated into cement mortars with two dosage levels (replacing 5% and 10% cement by mass). Designated testing programme including strength test, porosity test, and rapid chloride migration and diffusion test were employed to investigate the effect of modified hydrotalcites on...article 2015
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Yang, Z. (author), Fischer, H. (author), Polder, R. (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 component of mortar and/or concrete. In this paper, two types of modified hydrotalcites (MHT-pAB and MHT-NO2) were incorporated into cement mortars with two dosage levels replacing 5%...article 2015
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Pacheco, J. (author), Šavija, B. (author), Schlangen, E. (author), Polder, R.B. (author)The durability of cracked reinforced concrete is a serious concern in the construction industry. Cracks represent fast routes for chloride penetration, which can result in reinforcement corrosion. Bending or tapered cracks have the characteristic of being wider at the surface and becoming narrower towards the reinforcement. In reinforced...article 2014
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Yang, Z. (author), Fischer, H.R. (author), Cerezo, J. (author), Mol, J.M.C. (author), Polder, R.B. (author)A carbonate form of MgAl hydrotalcite, Mg(2)Al-CO3 and its p-aminobenzoate (pAB) modified derivative, Mg(2)Al-pAB, were synthesized and characterized by means of XRD, FT-IR and TG/DSC. The anticorrosion behavior of Mg(2)Al-pAB was evaluated based on open circuit potential (OCP) of carbon steel in simulated concrete pore solution and on chloride...article 2013
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Pacheco, J. (author), Polder, R.B. (author), Fraaij, A.L.A. (author), Mol, J.M.C. (author)Cathodic Protection (CP) of steel in concrete has been used over the past decades in order to increase the remaining service life of concrete infrastructure. CP involves the application of an electrical current to the corroding reinforcing bars, thus stopping and preventing further corrosion. The application of current on the reinforcing steel...conference paper 2012
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Yang, Z. (author), Fischer, H. (author), Polder, R. (author)A carbonate form of Mg-Al-hydrotalcite and its p-aminobenzoate (pAB) modified derivative (i.e.,Mg(2)Al-pAB) were synthesized and characterized by means of XRD and FT-IR. The anticorrosion behavior was evaluated based on open circuit potential (OCP) of carbon steel in simulated concrete pore solution and chloride-exchange experiments. The...conference paper 2012
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Pozzi, M. (author), Zonta, D. (author), Santana, J. (author), Colin, M. (author), Saillen, N. (author), Torfs, T. (author), Amditis, A. (author), Bimpas, M. (author), Stratakos, Y. (author), Ulieru, D. (author), Bairaktaris, D. (author), Frondistou-Yannas, S. (author), Kalidromitis, V. (author)The evaluation of seismic damage is today almost exclusively based on visual inspection, as building owners are generally reluctant to install permanent sensing systems, due to their high installation, management and maintenance costs. To overcome this limitation, the EU-funded MEMSCON project aims to produce small size sensing nodes for...conference paper 2011
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Polder, R.B. (author), Peelen, W.H.A. (author), Neeft, E.A.C. (author), Stoop, B.T.J. (author), TNO Bouw en Ondergrond (author)Over the last 25 years, cathodic protection (CP) of reinforced concrete structures suffering from chloride induced reinforcement corrosion has shown to be successful and durable. CP current causes steel polarisation, electrochemical reactions and ion transport in the concrete. CP systems are designed based on experience, which results in...article 2010
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Polder, R.B. (author), TNO Bouw en Ondergrond (author)The critical chloride content for initiation of reinforcement corrosion is an essential element in service life design and modelling of concrete structures.The critical content is laden with questions regarding its definition, experimental assessment and practical aspects. It should be addressed by a statistical approach. The paper discusses...article 2009
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Peelen, W.H.A. (author), Polder, R.B. (author), TNO Bouw (author)The new Dutch railway line the 'Betuweroute' crosses the main gas pipeline system of the 'Gasunie', the main Dutch gas distributor, at 7 locations. To ensure a safe operation of both the railway line and the pipeline system, it is essential to guarantee the mechanical stability of the gas pipes in the soft soil; therefore at several locations...conference paper 2004
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TNO Bouw (author), Polder, R.B. (author), Borsje, H. (author), de Vries, H. (author)Corrosion of reinforcement in concrete bridge decks may occur due to penetration of de-icing salts, even in the presence of an asphalt overlay. This paper reports a laboratory study into additional protection of concrete by hydrophobic treatment. It was found that hydrophobic treatment strongly reduces chloride ingress, both during semi...article 2001
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Siemes, A.J.M. (author), Edvardsen, C. (author), TNO Bouw (author)In the past decades much effort has been put into the improvement of the durability of concrete structures. This has resulted in a reasonable understanding of the main degradation processes or in experience with measures to prevent degradation. The results of this effort can be found in the present concrete codes and in manuals on durability...conference paper 1999
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de Vries, J. (author), Polder, R.B. (author), TNO Bouw (author)As part of the maintenance policy of the dutch Ministry of Transport, Civil Engineering Division, hydrophobic treatment of concrete was considered as an additional protective measure against penetration of aggressive substances, for instance deicing salts in bridge decks. A set of tests was designed to determine the performance of commercial...article 1997
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Prins Maurits Laboratorium TNO (author), van Doormaal, J.C.A.M. (author), Weerheijm, J. (author), Absil, L.H.J. (author)In this paper blast experiments on simply supported reinforced concrete slabs are described. The resistance-deformation curves and the deformation capacity of the slabs have been determined. Parameters in the experiments were the thickness of the slab, the amount of bending reinforcement, the diameter of the bending reinforcement and the type of...conference paper 1997
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van Doormaal, J.C.A.M. (author), Weerheijm, J. (author), Prins Maurits Laboratorium TNO (author)In this paper a test method to determine the deformation capacity and the resistance-deformation curve of blast-loaded slabs is described. This method was developed at TNO-PML. The method has been used to determine the ultimate deformation capacity of some simply supported reinforced concrete slabs in order to increase the knowledge of this...conference paper 1996
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Feenstra, P.H. (author), de Borst, R. (author), TNO Bouw (author)A composite yield function is used to describe the behavior of plain and reinforced concrete in biaxial stress under monotonic loading conditions. A Rankine yield criterion is used to monitor the in-plane tensile stresses and a Drucker Prager yield function controls the compressive stresses. A good agreement with experimental data for biaxial...article 1996