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Valcke, S.L.A. (author), Polder, R.B. (author), Nijland, T.G. (author), Leegwater, G.A. (author), Visser, J.H.M. (author), Bigaj-Van Vliet, A.A.J. (author)
The strength of concrete is linked to the amount of cement used. In many applications, concrete has a considerably higher strength than designed and structurally required. Lowering cement contents, thus reducing strength, significantly reduces the ecological impact of any concrete in terms of raw materials use and CO 2 output. A lower cement...
conference paper 2010
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Petković, J. (author), Huinink, H.P. (author), Pel, L. (author), Kopinga, K. (author), van Hees, R.P.J. (author), TNO Bouw en Ondergrond (author)
We have investigated whether a plaster which has two plaster layers with different pore sizes can act as a salt accumulating plaster system, in which salt crystallizes in the base layer of the plaster and not in the substrate or at the external surface. We used two substrates; fired-clay brick and Bentheim sandstone. On the substrate we applied...
article 2010
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van Hees, R.P.J. (author), van der Zwaag, S. (author)
Er zijn momenteel heel veel ontwikkelingen gaande in het materialenveld voor de bouw: materialen met lage energy footprint, materialen van biologische oorsprong, responsieve materialen, materialen met additionele functionaliteit en al deze nieuwe materialen komen elder in deze editie aan de orde. Naast deze zichtbare en in de nog te bouwen...
article 2011
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Baukh, V. (author), Huinink, H.P. (author), Adan, O.C.G. (author), Erich, S.J.F. (author), van der Ven, L.G.J. (author)
Water uptake by multilayer films plays an important role in their performance. Individual layers may consist of different polymeric phases. Understanding the water uptake in such systems requires knowledge of the water distribution, its state in the polymer, and influence on the polymeric phases. This study illustrates the application of high...
article 2011
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Polder, R.B. (author), Gieskens, B. (author), Bouwmeester, J. (author), Orgers, M. (author)
article 2011
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Havermans, J.B.G.A. (author), van Hees, R.P.J. (author), Adriaens, A. (author)
conference paper 2011
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Lubelli, B.A. (author), Nijland, T.G. (author), van Hees, R.P.J. (author)
In the present research a test procedure was set up to reproduce self-healing on lime-based (both pure calcium and magnesium-calcium) mortar specimens in laboratory. After few months testing, during which the specimens were subjected to wet-dry cycles, thin sections of the specimens were prepared and observed by Polarization and Fluorescence...
conference paper 2011
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Nijland, T.G. (author), Touret, J.L.R. (author)
Abstract Granulites constitute a major part of the (lower) continental crust, occurring on a regional scale in many metamorphic belts. Their origin is generally discussed in terms of vapour-absent melting and fluid-assisted dehydration. This last model is notably supported by the occurrence of two immiscible free fluids at peak- and retrograde...
bookPart 2012
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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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Havermans, J.B.G.A. (author)
article 2012
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Lubelli, B.A. (author), van Hees, R.P.J. (author)
OnEouten door het gebruik van kompressen is een techniek die meer en meer gebruiK wordt in de conservering van historisch metselwerk. Niettemin, wordt ontzouten nog vaak uitgevoerd op een trial and error basis, zonder wetenschappelijke kennis van de processen die vocht- en zouttranspoft regelen. Om het ontzoutingsproces te optimaliseren is,...
bookPart 2012
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Nijland, T.G. (author)
public lecture 2012
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Polder, R.B. (author), Worm, D. (author), Courage, W. (author), Leegwater, G. (author)
Corrosion of reinforcing steel in concrete structures causes concrete cracking and steel diameter reduction, eventually resulting in loss of safety. Conventional repair means heavy, labour intensive and costly work and the required quality level is under economic pressure. Consequently, conventional repair is short lived in many cases. An...
conference paper 2012
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Adan, O.C.G. (author), der Heijden, G.H.A.V. (author), Pel, L. (author)
The moisture transport in concrete subjected to fire is one of the most important processes with respect to fire spalling. The research on fire spalling of concrete is currently lacking experimental information of the moisture transport processes. We present combined moisture content and temperature profiles of one-sided heated concrete samples...
article 2012
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Nijland, T.G. (author), van Hees, R.P.J. (author), Bernardi, A. (author), Favaro, M. (author)
Opperulaktebehandelingen zoals steenverstevigen, hydrofoberen en antigraffiti bestaan al meer dan 100 jaar. Op het gebied van steenverstevigers wordt gebruik gemaakt van een reeks verschillende chemische producten, waarvan kiezelzure esters (ethylsilicaten zoals TEOS) thans de meest gangbare zijn (Nijland et al. 2009). Ze kennen echter hun...
bookPart 2012
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van Hees, R.P.J. (author), Lubelli, B.A. (author)
Welke schade komt er voor bij historisch metselwerk? Wat zijn de oorzaken? In dit hoofdstuk worden schadebeelden beschreven en getoond en de achterliggende processen uitgelegd. Een overzicht. Ook bespreken de auteurs waarop je bij herstel en onderhoud alert moet zijn, waarmee je rekening moet houden en welke vooronderzoeken misschien nodig zijn.
bookPart 2012
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Erkens, S. (author), van Vliet, D. (author), van Dommelen, A. (author), Leegwater, G.A. (author)
Most design methods for pavements use a factor explaining the difference between pavement life predictions from design models and performance in the road [1]. Part of this correction factor is healing, the natural capacity of asphalt concrete to recover in rest periods, which generally are not present in laboratory fatigue tests in order to...
conference paper 2012
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Bekker, M. (author), Huinink, H.P. (author), Adan, O.C.G. (author), Samson, R.A. (author), Wyatt, T. (author), Dijksterhuis, J. (author)
Indoor mold represents an important environmental concern, but a fundamental knowledge of fungal growth stages is needed to limit indoor fungal proliferation on finishing materials used in buildings. The present study focused on the succession of germination stages of the common indoor fungus Penicillium rubens on a gypsum substrate. This...
article 2012
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Lubelli, B.A. (author), van Hees, R.P.J. (author), Nijland, T.G. (author)
Oppervlaktebehandelingen zijn beschermingsmaatregelen waarbij op of via het oppervlak van de gevel (veelal chemische) middelen worden aangebracht. Het doel van een oppervlaktebehandeling is schade te herstellen en/of het oppervlak van de materialen te beschermen tegen toekomstige aantasting. In dit hoofdstuk worden waterafstotende en...
bookPart 2012
document
Šavija, B. (author), Schlangen, E. (author), Pacheco, J. (author), Polder, R.B. (author)
Reliable methods for controlled cracking of reinforced specimens in laboratory conditions are needed in order to experimentally study chloride ingress and reinforcement corrosion in cracks. In the paper, the Modified Wedge Splitting Test (MWST) for specimen cracking is presented. The setup is thoroughly explained, and the implications of...
conference paper 2012
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