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samenvatting Materiaalleer 3: deel Elke Knapen: H5 vers beton
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samenvatting Materiaalleer 3: deel Elke Knapen: hoofdstuk 5 vers beton
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Materiaalleer 3Hoofdstuk 5_deel Elke Knapen: VERS BETON
INHOUD
Voorbereiding – op de werf .................................................................................................................... 2
• Bekisting ...................................................................................................................................... 2
SOORTEN ......................................................................................................................................... 2
− Belastingen .............................................................................................................................. 2
− Beplatingsmaterialen .............................................................................................................. 3
− Plaatranden ............................................................................................................................. 3
− Centerpennen .......................................................................................................................... 3
− Ontkistingsproducten .............................................................................................................. 3
− Courante gebreken .................................................................................................................. 4
• Wapening .................................................................................................................................... 4
− Principe gewapend beton ....................................................................................................... 4
− Voorspanning door voorgerekt staal ...................................................................................... 4
− Voorspanning door nagerekt staal .......................................................................................... 4
− Vezels ....................................................................................................................................... 5
− Corrosie – betondekking ......................................................................................................... 5
Verwerking .............................................................................................................................................. 5
• Mengen ....................................................................................................................................... 5
• Materieel ..................................................................................................................................... 5
• Storten ......................................................................................................................................... 5
• Detaillering – aandachtspunten bij ontwerp v. zichtbeton ......................................................... 6
• Verdichten ................................................................................................................................... 6
• Beschermen ................................................................................................................................. 6
− Tegen uitdroging ..................................................................................................................... 6
− Tegen vorst .............................................................................................................................. 7
Eigenschappen v. vers beton ................................................................................................................... 7
• Consistentie (= verwerkbaarheid) ............................................................................................... 7
− Klassen (Abrams-kegel) ........................................................................................................... 8
• Stabiliteit ..................................................................................................................................... 8
Ontmenging vermijden = !! ..................................................................................................... 8
• Rijping .......................................................................................................................................... 8
Pagina 1 van 8
, Voorbereiding – op de werf
• Bekisting
− M sterk genoeg zijn: grote druk op wanden
− Beton op moment v. storten geen sterkte
− Flexibiliteit vormgeving
− Uitzicht betonopp. (glad/met structuur)
SOORTEN Traditionele Systeem- Speciale
= houten planken + schoren = stalen/aluminium frame ∙ Vooral voor kolommen
∙ Ev. verloren bekisting
Voordelen ∙ Flexibel ∙ Grotere repetitie ∙ Grote repetitie
∙ Lage mat.kost ∙ Hogere belastingen
∙ Compleet systeem
Nadelen ∙ Beperkte repetitie ∙ Stalen/aluminium frame ∙ Maatwerk
∙ Arbeidsintensief ∙ Niet flexibel
∙ Kleinere belastingen
− Belastingen
∙ Betonspeciedruk – verticaal
◦ Eigen gewicht bekisting + beton
Beton: 2500kg/m³ = 2,5x meer dan water
≠ uitgehard -> niet zelfdragend
Volledig gewicht komt op bekisting
◦ Opdrijven
Opwaartse drukken op bekisting (niet enkel druk op
bodemplaat)
∙ Betonspeciedruk – horizontaal
◦ Consistentie
Vloeib.h. betonspecie
Minder vloeib. = minder druk
◦ Gewelfvorming & ‘silo-effect’
Aftstand tss bekistingsplaten
Granulaten vormen soort v. gewelf: stapelen
Bekisting smaller = smallere boog gevormd =
minder druk
◦ Wrijving (ruwh. v. bekisting)
Ruwer opp. = betonspecie stroomt langzamer
n. beneden
Ruwer = minder druk
Pagina 2 van 8
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