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samenvatting Materiaalleer 3: deel Elke Knapen: H6 verhard beton
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samenvatting Materiaalleer 3: deel Elke Knapen: hoofdstuk 6 verhard beton
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Materiaalleer 3Hoofdstuk 6_deel Elke Knapen: VERHARD BETON
INHOUD
Beton: een heterogeen materiaal ........................................................................................................... 2
• Materiaalstructuur ...................................................................................................................... 2
− Capillariteit .............................................................................................................................. 2
Beton als constructiemateriaal ............................................................................................................... 2
• Mechanische eigenschappen ...................................................................................................... 2
− Mechanische sterkte ............................................................................................................... 2
− Vervorming .............................................................................................................................. 3
∙ Krimp ................................................................................................................................... 3
∙ Scheurvorming t.g.v. krimp ................................................................................................. 4
∙ Kruip .................................................................................................................................... 5
• Materiaalstructuur ...................................................................................................................... 5
− Porositeit ................................................................................................................................. 5
• Chemische aantasting ................................................................................................................. 6
− Corrosie door carbonatatie & indringing v. chlorides ............................................................. 6
− Zuren ....................................................................................................................................... 8
− Sulfaten.................................................................................................................................... 9
− Alkali-silica reactie ................................................................................................................... 9
• Vorst .......................................................................................................................................... 10
− Aantasting door dooizouten .................................................................................................. 10
• Brand ......................................................................................................................................... 11
• Thermische eigenschappen ....................................................................................................... 11
Pagina 1 van 11
, Beton: een heterogeen materiaal
• Materiaalstructuur
− Capillariteit
∙ Kleine poriën = hogere capillaire zuiging
∙ Fijnheid v.d. poriën = afh. van W/C- factor
◦ Hoge W/C-factor = meer water = grotere poriën
◦ Lage W/C-factor = minder water = kleinere poriën
Beton als constructiemateriaal
• Mechanische eigenschappen
− Mechanische sterkte
∙ Rijpingsfactor
◦ Druksterkte v. cement w doorheen tijd bereikt
◦ Afh. v.:
→ Cementsoort (sneluithardend,…)
→ Temperatuur (warm = sneller uitharden)
Zeker 1e dagen grote invloed
= ‘Rijpingsfactor‘
∙ Druksterkte
◦ Zie hoofdstuk 4: ‘sterkteklasse’
◦ Zowel op kubus als cilinder getest
∙ Treksterkte
◦ Moeilijke metingen: heterogeen beton
Resultaat erg afh. v.d. plaats waar gemeten w
Buigstreksterkte kan wel gemeten w
→ Buigmoment: onderaan trek + bovenaan druk
→ Wanneer breken? = meting treksterkte
Pagina 2 van 11
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