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samenvatting Materiaalleer 3: deel Elke Knapen: H7 speciale betontypes
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samenvatting Materiaalleer 3: deel Elke Knapen: hoofdstuk 7 speciale betontypes
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Materiaalleer 3Hoofdstuk 7_deel Elke Knapen: SPECIALE BETONTYPES
INHOUD
Zelfverdichtend beton (ZVB) ................................................................................................................... 2
VOORDELEN..................................................................................................................................... 2
NADELEN ......................................................................................................................................... 2
− Plaatsingsmethoden ................................................................................................................ 2
− Toepassingsmogelijkheden ..................................................................................................... 3
Vezelversterkt beton ............................................................................................................................... 3
VOORDELEN..................................................................................................................................... 3
NADELEN / AANDACHTSPUNTEN .................................................................................................... 3
− Structurele vs. niet-structurele toepassing ............................................................................. 3
− Toepassingsmogelijkheden ..................................................................................................... 4
Beton met gerecycleerde granulaten...................................................................................................... 4
• Milieu-impact v. beton ................................................................................................................ 4
− Milieu-impact verlagen ........................................................................................................... 4
1. Betonsamenstelllingen ........................................................................................................ 4
2. Veranderingsgericht ontwerpen ......................................................................................... 4
1. Recycling-beton ........................................................................................................................... 4
− 2 types gerecycleerde granulaten ........................................................................................... 4
∙ Betongranulaten v.h. type A+.............................................................................................. 4
∙ Menggranulaten v.h. type B+ .............................................................................................. 4
− Waar gebruikt? ........................................................................................................................ 5
1. Cement met lager klinkergehalte ................................................................................................ 5
2. Trias Materia ............................................................................................................................... 5
Zichtbeton ............................................................................................................................................... 6
− Zichtbeton vs. architectonisch beton vs. zichtbaar blijvend beton ......................................... 6
− Classificatie .............................................................................................................................. 6
∙ 3 zichtbetonklassen (A – B – C) o.b.v. 4 criteria (uitzicht) ................................................... 6
Pagina 1 van 6
, Zelfverdichtend beton (ZVB)
= Zo vloeibaar in verse toestand dat het zonder bijkomende verdichtingsenergie (bv. trilnaald) vlot
doorheen dicht wapeningsnet kan vloeien
− Voldoende stabiliteit tegen ontmenging:
∙ Blijft homogeen tijdens transport
∙ Visuele controle = !!
VOORDELEN NADELEN
∙ Minder intensief ∙ Geen helling mog.
∙ Minder (geluids)overlast (geen ∙ Duurder (moeilijker mengsel)
trilnaald) ∙ Hoge eisen mengproces
∙ Lager energieverbruik ∙ Hoge druk op bekisting door hoge
∙ Goed verdichting + beter opp. vloeibaarh.
◦ Vullen v.d. bekistingen gaat vlot: Duurdere bekistingen
egale opp.
◦ Constante + hoge kwaliteit
− Samenstelling (extra bestandsdelen)
∙ Superplastificeerder
∙ Minerale vulstof (= heel fijne deeltjes: gaan ontmenging tegen)
− Voorschrijven
∙ Hoge constructie-eisen
∙ Kleine max. korrel∅: makkelijk vloeien
∙ Aanvullende eisen: o.a. ontmeningsweerstand
− Plaatsingsmethoden
∙ Klassiek v. bovenaf vullen
! Risico op ontmenging
Valhoogte < 1m
∙ Dompelbuis langs bovenzijde bekisting
= Buis langs boven maar ondergedompeld in mengsel tijdens storten
! Hoge wapeningsdichth. & smalle bekistingen niet mog.
∙ Langs onderzijde met pomp
! Aangepaste bekisting nodig
◦ Voordelen: minder risico op ontmenging + egaler opp.
Pagina 2 van 6
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