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Borsje, H. (author), Polder, R.B. (author), de Vries, J. (author), TNO Bouw (author)
article 1996
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de Vries, J. (author), Polder, R.B. (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 commercially...
article 1996
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Gulikers, J.J.W. (author), de Vries, J. (author), Polder, R.B. (author)
Het chloridegehalte in een betonconstructie is een belangrijke graadmeter voor de kans op wapeningscorrosie. Twijfel over de betrouwbaarheid van chloridebepalingen door ver-schillende laboratoria, was voor Bouwdienst Rijkswaterstaat aanleiding een vergelijkend onderzoek te doen onder zeventien laboratoria. De uitslag was teleurstellend. Slechts...
article 1996
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Polder, R.B. (author)
Chloride penetration from sea water may cause corrosion of reinforcement in concrete structures. Adding reactive inorganic materials such as blast furnace slag, fly ash or silica fume to the cement matrix improves the resistance against chloride penetration as compared to Portland cement concrete. A relatively simple laboratory procedure was...
conference paper 1996
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Polder, R.B. (author)
Corrosion of prestressing steel may lead to sudden, so called brittle failure, due to the special microstructure of the steel and the high tensile forces. Such brittle failure may seriously reduce the load capacity of a prestressed concrete structure. In principle all stressed high strength steel is sensitive to this process. This paper focuses...
conference paper 1996
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de Vries, J. (author), Polder, R.B. (author), Borsje, H. (author)
Hydrophobic treatment makes a concrete surface absorb less water and less chloride. Hydrophobic treatment was studied as a protection agninst chloride penetration from deicing salts. Test methods were designed. Nine hydrophobic products were tested, of which three complied to the requirements on finished concrete surfaces. The water absorption...
conference paper 1996
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de Vries, J. (author), Polder, R.B. (author), Borsje, H. (author), TNO Bouw (author)
The subject of this study was the performance of hydrophobic treatment to protect concrete against chloride penetration from de-icing salts. Hydrophobic treatment makes a concrete surface absorb less water and less chloride. Several types of tests were carried out to study the performance of hydrophobised concrete. Salt ponding/drying tests...
conference paper 1998
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Polder, R.B. (author), Bakker, J.D. (author), Postema, F.J. (author), TNO Bouw (author)
As a case study, the cost of applying cathodic protection (CP) to the columns and beams supporting two bridges was compared to the cost of replacement (due to reinforcement corrosion). All costs during the service life of the CP system were considered: initial cost, annual checks, maintenance of anode systems and specialist supervision. It was...
conference paper 1998
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Polder, R.B. (author), Nuiten, P.C. (author), TNO Bouw (author)
Bij de publicatie in september 1996 van CUR-Aanbeveling 45 'Kathodische bescherming van wapening in betonconstructies' is in Cement een artikel verschenen over de techni-sche kanten van kathodische bescherming (KB) [1]. Met de Aanbeveling werd geen nieu-we techniek geïntroduceerd: in de afgelopen 10 jaar zijn in ons land immers al ongeveer 20...
article 1998
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Polder, R.B. (author), Nerland, O.C. (author), TNO Bouw (author)
An experimental study of cathodic protection (CP) was carried out with a conductive primer anode applied to specimens from a concrete bridge. The bridge was demolished after 30 years of service due to severe delaminations and reinforcement corrosion. Four specimens of approximately 1 m2 each were made and characterised by steel potential,...
conference paper 1998
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Polder, R.B. (author), Bakker, J.D. (author), Postema, F.J. (author), TNO Bouw (author)
Kathodische bescherming (KB) van gewapend beton tegen schade door corrosie van de wapening is in Nederland inmiddels een geaccepteerde methode. In Cement zijn diverse artikelen verschenen over de technische kanten van KB. De economische aspecten heb-ben minder aandacht gekregen. Daarom hebben de Bouwdienst Rijkswaterstaat en TNO Bouw een case...
article 1998
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Polder, R.B. (author), van den Hondel, A.W.M. (author), TNO Bouw (author)
influence on chloride extraction was studied of: cement type (Portland, blast furnace slag), water-cement-ratio, cover to the reinforcement, steel geometry, amount of charge passed, type of electrolyte. Additionally some potential killing factors and the effect on corrosion pits were studied. Chloride profiles before and after treatment were...
conference paper 1998
document
de Vries, J. (author), Polder, R.B. (author), Borsje, H. (author), TNO Bouw (author)
The subject of this study was the performance of hydrophobic treatment to protect concrete against chloride penetration from de-icing salts. Hydrophobic treatment makes a concrete surface absorb less water and less chloride. Test methods and requirements for commercial products were established. In most cases, the water absorption was strongly...
conference paper 1998
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van den Hondel, A.W.M. (author), Polder, R.B. (author), TNO Bouw (author)
Concrete specimens were cast and subsequently exposed to elevated levels of carbon dioxide and low relative humidity for a period of 70 weeks. After exposure, 32 specimens were treated by electrochemical realkalisation using a 1 molar sodium carbonate solution and a current density of 1 or 4 A/m2 (steel surface) for 3, 7 or 14 days. Experimental...
conference paper 1998
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Polder, R.B. (author), TNO Bouw (author)
In de afgelopen jaren is bij beheerders van kunstwerken de indruk ontstaan dat in sommi-ge gevallen het beton onder de asfaltdeklaag schade vertoont in de vorm van verlies van samenhang. De frequentie en de oorzaken waren onbekend. De CUR heeft hiernaar eerst een inventarisatie en vervolgens een gericht onderzoek uitgevoerd. Dit artikel geeft de...
article 1998
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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), 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
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Polder, R.B. (author), TNO Bouw (author)
Kathodische bescherming (afgekort KB) is een moderne techniek om corrosie van wapening in betonconstructies te bestrijden. KB is in Nederland op meer dan 20 gebouwen en op zeven kunstwerken toegepast. Sinds 1996 bestaat CUR-Aanbeveling 45 "Kathodische bescherming van beton", die is opgesteld op grond van ervaringen van betrokken bedrijven en...
conference paper 1999
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TNO Bouw (author), Stoop, B.T.J. (author), Polder, R.B. (author)
article 1999
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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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