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Silane derivative coated AR-glass rovings for use in textile reinforced concrete
Fresh concrete has pH-values of up to 13. Therefore in textile reinforced concrete, alkali resistant (AR) glass rovings containing zirconia and titanium oxide are used, which significantly improve alkali resistance. Even AR-glass rovings, however, are subject to corrosion at high pH-values. Silane derivatives with an organic functional group can be used for fiber coatings, which give the surface a more hydrophobic character, diminishing the deterioration by pore liquids in concrete. The silane derivative tetraethoxy orthosilicate with dibutyltin dilaurate as a catalyst and different formulations of a commercial stone hardener with precondensed silane derivatives are used. The glass yarns are treated with the silane derivatives and exposed to air saturated with water vapor at 295 K for condensation to allow quantitative curing. The surface of the filaments is analyzed by means of optical microscopy, AFM, SEM, and XPS. On the filament surfaces different structures develop: covering of single filaments, smooth surfaces on embedded filaments, and small structures of 3 - 50 um, as well as flaws. The surface roughness is a function of time. The effect of the different topographies on the interconnection between the filaments, and also with the concrete matrix, has to be investigated.
Silane derivative coated AR-glass rovings for use in textile reinforced concrete
Fresh concrete has pH-values of up to 13. Therefore in textile reinforced concrete, alkali resistant (AR) glass rovings containing zirconia and titanium oxide are used, which significantly improve alkali resistance. Even AR-glass rovings, however, are subject to corrosion at high pH-values. Silane derivatives with an organic functional group can be used for fiber coatings, which give the surface a more hydrophobic character, diminishing the deterioration by pore liquids in concrete. The silane derivative tetraethoxy orthosilicate with dibutyltin dilaurate as a catalyst and different formulations of a commercial stone hardener with precondensed silane derivatives are used. The glass yarns are treated with the silane derivatives and exposed to air saturated with water vapor at 295 K for condensation to allow quantitative curing. The surface of the filaments is analyzed by means of optical microscopy, AFM, SEM, and XPS. On the filament surfaces different structures develop: covering of single filaments, smooth surfaces on embedded filaments, and small structures of 3 - 50 um, as well as flaws. The surface roughness is a function of time. The effect of the different topographies on the interconnection between the filaments, and also with the concrete matrix, has to be investigated.
Silane derivative coated AR-glass rovings for use in textile reinforced concrete
Mit einem Silanderivat beschichtete, alkaliresistente Glasfaserbänder für textilverstärkten Beton
Arnold, J.A. (author) / Höcker, H. (author)
2003
5 Seiten, 2 Bilder, 2 Quellen
Conference paper
English
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