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Samenvatting deel 5: bindmiddel, mortel en beton

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Deel 5 van het vak materialen 1 (sem 1) 5/6

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Uploaded on
February 5, 2022
Number of pages
2
Written in
2021/2022
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Bindmiddelen
Sommige materialen bestaan uit basismateriaal + bindmiddel
- Basismateriaal:
Verweerde natuursteen: grind of zand
Gebroken materiaal: steenslag
Fabrieksmatig materiaal: lasslak, keramische korrels, glas, …
- Bindmiddel:
Chemische bindmiddelen: harsen
Traditionele bindmiddelen: kalk, gips en cement

SOORT: Kalk
Gebrande kalksteen -> ongebluste kalk
Hydraulische kalk Luchtkalk of vette kalk Schelpenkalk
Verhardt in contact met Niet hydraulisch – heeft Gebrande schelpen uit zee
water (= hydraulisch) -> koolzuur uit de lucht nodig Licht hydraulisch / scherp /
moet droog geblust worden om te verharden lichtgrijs
Voor metsel- en Voor binnen bepleistering /
pleistermortel witkalk

SOORT: GIPS
Gebrande waterhoudende zwavelzure kalksteen
Verhardt met water
Verhardt snel en zet uit
Niet hydraulisch
Brandwerend door gebonden water
Voor toeslag in kalkpleistermortel (= beslag van dat materiaal) -> verhardt sneller, verhindert
krimp, witter
Voor gipskartonplaten, gipsblokken

SOORT: Cement
Hydraulisch bindmiddel
Vele soorten: portlandcement (meest toegepast), witte cement, aluminiumcement voor
vuurvaste mortel
Verharding verloopt in twee fasen:
1) Binding:
Chemische reactie met water + warmteafgifte -> verstijven van water-cementbrij
binding mag niet verstoort worden door trilling, … / heeft voldoende hoeveelheid
water nodig / mag niet bevriezen
2) Verharding
Na enkele uren – verloopt traag – duurt maanden
Voor metselmortel, waterdichte pleistermortel, mortel voor dekvloeren, beton
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