A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Enhancement of the durability of alkali-resistant glass-rovings in concrete
Two different ways to enhance the durability of alkali-resistant glass rovings in concrete were investigated. For this, the rovings were coated either with insoluble epoxy resins or chemically reactive dispersions. Accelerated ageing was performed to investigate the long term properties of the coated rovings in concrete. Both coatings lead to a dramatic increase in the durability, i.e. a significantly increased tensile strength of the glass rovings after accelerated ageing. Rovings coated with epoxy resins additionally exhibit very high tensile strengths before ageing and, thus, qualify for highly stressed constructional elements. However, spalling of the concrete cover occurs close to the point of failure of the specimens. Modifications of the epoxy-coating as well as the use of polymer modified concretes are under current investigation. With this, the bond at the concrete/reinforcement interface should be improved. Rovings coated with chemically reactive mixtures such as silica fume/poly(vinyl acetate) or cement/silica fume/poly(vinyl acetate) exhibit lower tensile strengths before ageing than rovings coated with epoxy resins. However, since the overall load levels are lower and load transfer is, due to the even distribution of filaments in the cementitious matrix, distributed over a large surface area, spalling of the concrete cover is not observed. The modular, three component system of the chemically reactive mixtures allows a fine tuning of the interfacial properties and, thus, macroscopic performance.
Enhancement of the durability of alkali-resistant glass-rovings in concrete
Two different ways to enhance the durability of alkali-resistant glass rovings in concrete were investigated. For this, the rovings were coated either with insoluble epoxy resins or chemically reactive dispersions. Accelerated ageing was performed to investigate the long term properties of the coated rovings in concrete. Both coatings lead to a dramatic increase in the durability, i.e. a significantly increased tensile strength of the glass rovings after accelerated ageing. Rovings coated with epoxy resins additionally exhibit very high tensile strengths before ageing and, thus, qualify for highly stressed constructional elements. However, spalling of the concrete cover occurs close to the point of failure of the specimens. Modifications of the epoxy-coating as well as the use of polymer modified concretes are under current investigation. With this, the bond at the concrete/reinforcement interface should be improved. Rovings coated with chemically reactive mixtures such as silica fume/poly(vinyl acetate) or cement/silica fume/poly(vinyl acetate) exhibit lower tensile strengths before ageing than rovings coated with epoxy resins. However, since the overall load levels are lower and load transfer is, due to the even distribution of filaments in the cementitious matrix, distributed over a large surface area, spalling of the concrete cover is not observed. The modular, three component system of the chemically reactive mixtures allows a fine tuning of the interfacial properties and, thus, macroscopic performance.
Enhancement of the durability of alkali-resistant glass-rovings in concrete
Verbesserung der Haltbarkeit von alkalibeständigen Glasfaservorgarnen in Beton
Büttner, T. (author) / Orlowsky, J. (author) / Raupach, M. (author) / Hojczyk, M. (author) / Weichold, O. (author)
2010
10 Seiten, 6 Bilder, 2 Tabellen, 18 Quellen
Conference paper
English
Verbesserung , Haltbarkeit , Glasfaser , Vorgarn , Alkalibeständigkeit , textilverstärkter Beton , beschichtete Faser , Epoxidharz , Abplatzen , Faser/Matrix-Haftung , Beschichtungsmittel , Mischung (Stoff) , Zement , Polyvinylacetat , Silicafeinststaub , Spannungsverteilung (mechanisch) , pH-Wert , Verminderung , Systemvergleich
British Library Online Contents | 2009
S-1 Glass rovings approved for blades
British Library Online Contents | 2009
Transverse Permeability of Direct Glass Rovings
| British Library Online Contents | 2000
Silane derivative coated AR-glass rovings for use in textile reinforced concrete
| Tema Archive | 2003