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- Polder, R.B. (author), TNO Bouw (author) public lecture 2003
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de Rooij, M.R. (author), Polder, R.B. (author)For effective design for durability and maintenance, knowledge of the penetration process of chloride into concrete is of paramount importance. Such knowledge is important for accurate modelling of the time to initiation of reinforcement corrosion. In this paper the acquisition of model parameters for chloride penetration based on chloride...conference paper 2003
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- Polder, R.B. (author), de Rooij, M.R. (author), de Vries, H. (author), Gulikers, J.J.W. (author), TNO Bouw (author) conference paper 2003
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- Peelen, W.H.A. (author), Polder, R.B. (author), TNO Bouw (author) conference paper 2003
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Polder, R.B. (author), Peelen, W.H.A. (author), Schuten, G. (author), TNO Bouw (author)Samples were studied of conductive coatings that had served as anode material in concrete cathodic protection (CP) systems in Norway and The Netherlands for up to about 9 years. Techniques used were light microscopy and scanning electron microscopy (SEM), carried out on thin section samples of about 25 μm thickness. Observation of the coating...article 2003
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Peelen, W.H.A. (author), Polder, R.B. (author), TNO Bouw (author)The throwing power of the Zinc-Hydrogel Anode for sacrificial protection of steel in concrete was studied in the laboratory under controlled environments. The anode to steel ratio in the specimens was 1. The corrosion state of the rebar is moderate. The results indicate that for a concrete resistivity of 600 Qm and higher the ohmic drop in the...conference paper 2002
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Polder, R.B. (author), Nijland, T.G. (author), Peelen, W.H.A. (author), Bertolini, L. (author), TNO Bouw (author)Cathodic protection has proven to be a reliable and economic method to stop corrosion in reinforced concrete structures. Many systems with activated titanium mesh anode embedded in cementitious mortar have functioned for more than 10 years. The service life depends on the anode/overlay system, which may be determined mainly by acid production...conference paper 2002
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Polder, R.B. (author), Peelen, W.H.A. (author), TNO Bouw (author)Concrete prisms were made with four cement types including cements with fly ash and/or blast furnace slag and three waterto- cement (w/c) ratios. Chloride penetration and corrosion of rebars were stimulated by subjecting prisms to cyclic loading with salt solution and drying. Concrete resistivity, steel potentials and corrosion rates were...article 2002
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Polder, R.B. (author), Visser, J.H.M. (author), TNO Bouw (author)Concrete specimens with various binders including Portland cement, fly ash, blast furnace slag and composite cement and three water-to-cement ratios were subjected to cyclic wetting with salt solution and drying. After salt loading for half a year, chloride profiles were determined. Subsequently, chloride loading was discontinued and specimens...conference paper 2002
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Nerland, O.C. (author), Polder, R.B. (author), TNO Bouw (author)When the first trials with Cathodic Protection (CP) on reinforced concrete (RC) structures were carried out nearly 30 years ago the main aim was treating steel in bridge decks, suffering from chloride induced corrosion. Various types of anode systems (conductive asphalt, conductive mortars, carbon fibre strips, since the early 1980s titanium...conference paper 2002
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Polder, R.B. (author), Peelen, W.H.A. (author), Bertolini, L. (author), Guerriere, M. (author), TNO Bouw (author)Concrete specimens with various binders including Portland cement, fly ash, blast furnace slag and composite cement and three water-to-cement ratios were subjected to cyclic wetting with salt solution and drying. Specimens contained six mild steel bars at two cover depths and two activated titanium reference electrodes. After salt loading for...conference paper 2002
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TNO Bouw (author), Polder, R.B. (author), van den Hondel, A.W.M. (author)Chloride extraction of concrete is a short-term electrochemical treatment against corrosion of reinforcing steel. The aim is to remove chloride ions from the concrete cover in order to reinstate passive behaviour. Physically sound concrete is left in place. To make this method more predictable and reliable, a laboratory study was carried out....article 2002
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- Polder, R.B. (author), Gulikers, J.J. (author), TNO Bouw (author) article 2001
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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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Polder, R.B. (author)In dit artikel wordt een schets gegeven van de ontwikkelingen op het gebied van kathodische bescherming (KB) van beton.conference paper 2000
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- Polder, R.B. (author), de Vries, J. (author) report 2000
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Polder, R.B. (author)This paper describes methods to assess concrete resistivity on site for various purposes related to corrosion and protection of reinforcement. It is based on a first draft of a RILEM Technical Recommendation. The electrical resistivity of concrete can be related to the two processes involved in corrosion of reinforcement: initiation (chloride...conference paper 2000
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Schuten, G. (author), Leggedoor, J. (author), Polder, R.B. (author), TNO Bouw (author)Corrosion of reinforcement in precast concrete ground floor elements containing mixed in chloride can cause considerable damage. This is a major problem in the Netherlands concerning a large number of privately owned houses. Conventional concrete repair is not acceptable because it does not provide sufficient durable safety. Cathodic protection...conference paper 1999
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- Polder, R.B. (author), TNO Bouw (author) conference paper 1999
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Polder, R.B. (author), de Vries, H. (author), TNO Bouw (author)Penetration of de-icing salts into concrete bridge decks may cause corrosion of reinforcement. Hydrophobic treatment of concrete was studied as additional protection. It was shown that hydrophobic treatment strongly reduces chloride ingress, during semi-permanent contact and in wetting/drying situations. The protection remains effective for at...conference paper 1999