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Waterborne epoxies in cementitious matrices used for textile reinforced concrete
TRC (textile reinforced concrete) represents an interesting new construction material, offering several additional advantages compared to steel or fibre reinforced concrete. These advantages dominate in those fields of applications where thin-walled, structural elements with a high load carrying capacity are required. In TRC, mostly textiles made of alkali resistant glass (AR-glass) fibres are applied in order to carry the forces arising by tensile load. Even though the reinforcement is called AR-glass, there is a strength loss due to the alkalinity of the concrete. In order to reduce the strength loss of AR-glass reinforcement embedded in cementitious matrices waterborne epoxies are used for concrete modification. The aim of the polymer addition is to reduce the amount of capillary water absorption as well as the depth of water penetration into the matrix. In this paper the effect of epoxy additions on the water absorption properties of the concrete matrix is described resulting in a change of the ageing behaviour of TRC. Furthermore the influence of alkaline, humid curing conditions, which can be compared to the conditions in concrete, on the microstructure and the properties of waterborne epoxies was investigated. These investigations are complemented by investigations of the polymeric distribution in the matrix and the PCC-microstructure.
Waterborne epoxies in cementitious matrices used for textile reinforced concrete
TRC (textile reinforced concrete) represents an interesting new construction material, offering several additional advantages compared to steel or fibre reinforced concrete. These advantages dominate in those fields of applications where thin-walled, structural elements with a high load carrying capacity are required. In TRC, mostly textiles made of alkali resistant glass (AR-glass) fibres are applied in order to carry the forces arising by tensile load. Even though the reinforcement is called AR-glass, there is a strength loss due to the alkalinity of the concrete. In order to reduce the strength loss of AR-glass reinforcement embedded in cementitious matrices waterborne epoxies are used for concrete modification. The aim of the polymer addition is to reduce the amount of capillary water absorption as well as the depth of water penetration into the matrix. In this paper the effect of epoxy additions on the water absorption properties of the concrete matrix is described resulting in a change of the ageing behaviour of TRC. Furthermore the influence of alkaline, humid curing conditions, which can be compared to the conditions in concrete, on the microstructure and the properties of waterborne epoxies was investigated. These investigations are complemented by investigations of the polymeric distribution in the matrix and the PCC-microstructure.
Waterborne epoxies in cementitious matrices used for textile reinforced concrete
Einsatz wasserbasierter Epoxidharze in zementhaltigen Bindemitteln für Textilbeton
Keil, Allessandra (author) / Raupach, Michael (author) / Puterman, Moshe (author)
2010
8 Seiten, 6 Bilder, 4 Tabellen, 10 Quellen
Conference paper
English
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