Searched for: author:"Valcke, S.L.A."
(1 - 20 of 20)
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Nedeljkovic, M. (author), Visser, J.H.M. (author), Nijland, T.G. (author), Valcke, S.L.A. (author), Schlangen, E. (author)
In circular concrete design, beside cement replacement with more environmentally friendly cement types, there is also an urgent need for sand replacement with fine recycled concrete aggregates (fRCA). The variations in physical and chemical properties of fRCA and lack of standards for their quality evaluation are the main reasons for not yet...
article 2021
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Nedeljkovic, M. (author), Visser, J.H.M. (author), Savija, B. (author), Valcke, S.L.A. (author), Schlangen, E. (author)
This paper discusses the state-of-the-art of the fine recycled concrete aggregates (fRCA), focusing on their physical and chemical properties, engineering properties and durability of concretes with fRCA. Based on the systematic review of the published literature, it is impossible to deduce without any further research the guidelines and tools...
article 2021
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Valcke, S.L.A. (author)
TNO, M2i, TU Delft, Twee R Recycling, Cementbouw Recycling, AVG en BRBS Recycling slaan de handen in elkaar om de komende twee jaar onderzoek te doen naar optimaal hergebruik van de fijne fractie van gerecycled beton in nieuw beton
article 2018
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Valcke, S.L.A. (author)
Op steeds meer plekken in bouwprojecten worden geopolymeer gebaseerde bouwmaterialen toegepast. Ondertussen wordt ook nog steeds heel veel onderzoek gedaan naar dit soort materialen. Tijdens een workshop die op 23 februari plaatsvond, kwamen internationale koplopers en bezoekers uit verschillende markt-en onderzoekssegmenten bij elkaar om de...
article 2018
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Vinai, R. (author), Panagiotopoulou, C. (author), Soutsos, M. (author), Taxiarchou, M. (author), Zervaki, M. (author), Valcke, S.L.A. (author), Ligero, V.C. (author), Couto, S. (author), Gupta, A. (author), Pipilikaki, P. (author), Alvarez, I.L. (author), Coelho, D. (author), Branquinho, J. (author)
Worldwide, the building sector requires the production of 4 billion tonnes of cement annually, consuming more than 40% of global energy. Alkali activated “cementless” binders have recently emerged as a novel eco-friendly construction material with a promising potential to replace ordinary Portland cement. These binders consist of a class of...
article 2015
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Valcke, S.L.A. (author), Pipilikaki, P. (author), Fischer, H.R. (author)
Secondary resources containing (catcium) atuminium-silicate phases, e.g., fly ash, slag or bottom ash are used as precursor for binders such as geopolymers. Because secondary resources can be highly variable in terms of their potential to dissolve and form reaction products, analytical methods are needed to evaluate their potential as a...
conference paper 2015
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Valcke, S.L.A. (author), Pipilikaki, P. (author), Fischer, H.R. (author)
conference paper 2015
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Valcke, S.L.A. (author)
Geopolymeren zijn belangrijk voor de 'verduurzaming' van beton. Daar waar Portlandcement als bindmiddel in beton hooguit bijgemengd kan worden met secundaire grondstoffen zoals slak en vliegas, bestaan geopolymeren voornamelijk uit deze of andere secundaire grondstoffen, zonder cement. Dit levert een aantal belangrijke voordelen op: als...
article 2015
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Valcke, S.L.A. (author), de Bresser, J.H.P. (author), Pennock, G.M. (author), Drury, M.R. (author)
Recrystallized grains are potentially useful as indicators of palaeostress in naturally deformed rocks, providing that well-calibrated relationships (palaeopiezometers) exist between the recrystallized grain size and stress. Rocks can exhibit microstructures that are heterogeneous, that is, containing recrystallized as well as deformed grains,...
article 2014
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Valcke, S.L.A. (author), Pipilikaki, P. (author), Fischer, H.R. (author), Verkuijlen, M.H.W. (author), Eck, E.R.H. (author)
Geopolymers are systems of inorganic binders that can be used for sustainable, cementless concrete and are formed by alkali activation of an aluminium–silicate precursor (often secondary resources like fly ash or slag). The type of aluminium– silicate precursor and its potential variations within one batch may influence geopolymer performance....
article 2014
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Dijkmans, T.J.A. (author), Donkervoort, D.R. (author), Phaff, J.C. (author), Valcke, S.L.A. (author)
Current solutions for highly energy-efficient retrofitting rely on thick static insulation, airtight construction and extensive ventilation systems to become independent from variable outdoor conditions. A building skin that adapts to the outdoor conditions to regulate the indoor conditions could provide an interesting alternative for current...
conference paper 2014
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Valcke, S.L.A. (author), Pipilikaki, P. (author), Sarabér, A.J. (author), Fischer, H.R. (author), Nugteren, H.W. (author)
Driven by cost and sustainability, secondary resource materials such as fly ash, blast furnace slag, and bottom ash are increasingly used for alternative types of concrete binders, such as geopolymers. Because secondary resources may be highly variable from the perspective of geopolymers, it is often a challenge to upscale these binder types to...
article 2013
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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.J. (author)
Most high filler concrete studies are based on relatively high contents of powder (cement + filler) (>400 kg m-3). This paper aims to increase the total fly ash content relative to the clinker content, while simultaneously minimizing the total powder content in the concrete to values lower than 300 kg m-3. The motivation for decreasing the total...
article 2012
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Valcke, S.L.A. (author), Leegwater, G.A. (author), Erkens, S. (author), Maagdenberg, T. (author)
Extreme wintercondities, zoals vorst-dooi, kunnen tot veel schade leiden in allerlei materialen. Bij zeer open asfalt (ZOAB) kan vorstschade leiden tot rafeling maar op dit moment is geen betrouwbare vorst-dooi test voor handen om de gevoeligheid voor dit type schade vast te stellen. ZOAB is dusdanig uniek met zijn open poriestructuur en lage...
conference paper 2012
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Valcke, S.L.A. (author), Nijland, T.G. (author), Larbi, J.A. (author), TNO Bouw en Ondergrond (author)
conference paper 2010
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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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de Rooij, M.R. (author), Valcke, S.L.A. (author), Visser, J.H.M. (author), TNO Bouw en Ondergrond (author)
article 2010
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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.J. (author), TNO Bouw en Ondergrond (author)
conference paper 2010
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Erkens, S. (author), Vervuurt, A.H.J.M. (author), Houben, L. (author), Maagdenberg, T. (author), Valcke, S.L.A. (author)
In 2008 is in de rechter rijstroken van de A32 nabij Wolvega (aangelegd in 1986-1988) de asfaltverharding met hoogovenslakkenfundering op een aantal plaatsen onverwacht en vrij abrupt bezweken. Er ontstonden flinke verzakkingen en daarin vertoonde de asfaltverharding ernstige scheurvorming. Draagkrachtmetingen toonden aan dat de fundering over...
conference paper 2010
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Valcke, S.L.A. (author), de Rooij, M.R. (author), Visser, J.H.M. (author), Nijland, T.G. (author), TNO Bouw en Ondergrond (author)
Hydration of clinker particles is since long a topic of interest in both designing and optimizing cement composition and its quantity used in concrete. The interest for carefully observing and also quantifying the type or stage of clinker hydration in hardened cement paste is twofold. Firstly, the characteristics of the hydration features can...
conference paper 2010
Searched for: author:"Valcke, S.L.A."
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