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Alle Oberthemen / Baustoffkunde / Gesteinskörnung / Baustoffkunde-Gesteinskörnung (3)

Phsyiklische Anforderungen

Physikalische Anforderungen an Gesteinskörnungen
Welche der festgelegten Eigenschaften notwendigerweise zu prüfen sind, hängt von der vorgesehenen Endanwendung und der Herkunft der Gesteinskörnung ab. Falls es verlangt wird, müssen die vorgesehenen Prüfungen herangezogen werden, um die entsprechenden physikalischen Eigenschaften zu bestimmen.

Widerstand gegen Zertrümmerung
• Los Angeles-Koeffizient (LA)
• Schlagzertrümmerungswert (SZ)
• Widerstand gegen Verschleiß von groben Gesteinskörnungen (MDE)
• Widerstand gegen Polieren (PSV)
• Widerstand gegen Oberflächenabrieb (AAV)

Kornrodichte u Wasseraufnahme
>Einfach zu prüfen, Geringe Schwankungen bei gleicher Kornart
>Wichtig ist die Wasseraufnahme von leichten und rezyklierten Gesteinskörnungen. Das in die Körner aufgesaugte Wasser steht für den wirksamen w/z-Wert nicht zur Verfügung

Frost- und Tau-Widerstand
>Frostwiderstand ist nach DIN EN 1367-1,-2 zu bestimmen
>Referenzverfahren: für den Frostwiderstand Frostversuch in Wasser, für den Frost-Tausalz-Widerstand der Magnesiumsulfatversuch
>Möglich aber auch Prüfungen mit 1 % -igerNaCl-Lösung an Gesteinskörnungen und Betonfrostversuche

Alkali-Kieselsäure-Reaktivität
>Mögliche Reaktion der Gesteinskörnung mit den in der Porenflüssigkeit des Betons vorhandenen Alkalihydroxiden
>Kann zu Treiberscheinungen u folgender Rissbildung, Zerstörung führen
>Häufigste Form: Reaktion der Alkalien mit Formen d Kieselsäure
>Alkalienempfindliche Bestandteile: Opalsandstein einschließlich Kieselkreide, Flinte, Grauwacke

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Karteninfo:

Autor: Claudii

Oberthema: Baustoffkunde

Thema: Gesteinskörnung

Schule / Uni: TU Darmstadt

Ort: Darmstadt

Veröffentlicht: 29.03.2010

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