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Chemical bonding of concrete and steel reinforcement using a vitreous enamel coupling layer
The bond between the cement paste and steel reinforcement in concrete structures is typically very weak. Enameling the steel reinforcement with a low-melting point vitreous enamel that contains calcium silicates and calcium aluminoferrites raises the bond strength by a factor of approximately two to four times the normal bond adhesion. An X-ray diffraction study and SEM (scanning electron microscopy) imaging and a rnicroanalytical examination of the bonding enamel layer indicates the calcium silicates and calcium aluminoferrites fused into the enamel react with the moisture in the fresh mortar and form a calcium silicate hydrate surface that adheres to the surrounding paste. The increased bond strength demonstrates that the enamel-cement coating acts as a coupling layer and attaches the hardening calcium silicate gel layer to the steel. During hydration, the composite cement-glass layer reacts with water that accumulates at the interface and appears to prevent the usual weakly-cemented layer from occurring in the adjacent paste. Additionally the bonding enamel can be applied to provide a durable chemically-resistant layer to protect the steel from oxidation.
Chemical bonding of concrete and steel reinforcement using a vitreous enamel coupling layer
The bond between the cement paste and steel reinforcement in concrete structures is typically very weak. Enameling the steel reinforcement with a low-melting point vitreous enamel that contains calcium silicates and calcium aluminoferrites raises the bond strength by a factor of approximately two to four times the normal bond adhesion. An X-ray diffraction study and SEM (scanning electron microscopy) imaging and a rnicroanalytical examination of the bonding enamel layer indicates the calcium silicates and calcium aluminoferrites fused into the enamel react with the moisture in the fresh mortar and form a calcium silicate hydrate surface that adheres to the surrounding paste. The increased bond strength demonstrates that the enamel-cement coating acts as a coupling layer and attaches the hardening calcium silicate gel layer to the steel. During hydration, the composite cement-glass layer reacts with water that accumulates at the interface and appears to prevent the usual weakly-cemented layer from occurring in the adjacent paste. Additionally the bonding enamel can be applied to provide a durable chemically-resistant layer to protect the steel from oxidation.
Chemical bonding of concrete and steel reinforcement using a vitreous enamel coupling layer
Chemische Bindung von Beton und Stahlfaserverstärkung mittels einer glasigen Emailkopplungsschicht
Lynch, Larry (author) / Weiss, Charles jun. (author) / Day, Donna (author) / Tom, Joe (author) / Malone, Philip (author)
2008
13 Seiten, 8 Bilder, 4 Tabellen, 23 Quellen
Conference paper
English
Portlandzement , stahlfaserverstärkter Beton , Kupplungskomponente (Chemie) , Metallemail , Calciumsilicat , chemische Reaktion , Feuchtegehalt , Mörtel , chemische Zusammensetzung , Fritte (Glasmasse) , Schutzschichtbildung , Stahlfaser , XRD (Röntgenstrahlbeugung) , REM (Rasterelektronenmikroskopie) , Festigkeitserhöhung , Bindung , Morphologie (Körper) , kristalline Struktur
Local bond strength of vitreous enamel coated rebar to concrete
| British Library Online Contents | 2012
Local bond strength of vitreous enamel coated rebar to concrete
| Online Contents | 2012
Local bond strength of vitreous enamel coated rebar to concrete
| British Library Online Contents | 2012