Abstract
In the context of the application of carbon Textile Reinforced Concrete (TRC) layers for the durable repair of building surfaces, uniaxial tensile tests on rectangular TRC samples were carried out to compare the bond and load-bearing behavior of an epoxy-impregnated carbon textile and its surface modified version. The aim of the surface modification, consisting of a subsequent coating with epoxy resin and sanding with quartz sand, is the improvement of the composite material regarding crack width reduction and an increase of the load-bearing capacity. A total of 15 series were examined and the parameters: reinforcement type, orientation and ratio were varied. In addition, long-term load tests were conducted. An optical 3D-video measuring system in combination with a DIC-software was used, which allowed the analysis of the process of crack formation during the entire testing time. With the surface modified reinforcement the formation of approx. 1.5 times the number of cracks with averagely 33 % smaller crack widths and up to 50 % smaller crack spacings were observed, regardless of the ratio of reinforcement. The residual behaviour of the series subjected to a permanent load of 1500 MPa over 1000 h showed no reduction of the tensile stress compared to short-term tests.
Highlights
Due to its specific properties Textile Reinforced Concrete (TRC) can be used for purposes ranging from the strengthening of existing structures to new load bearing constructions
Because of its high tensile strength and the non-corrosiveness of textile reinforcements, TRC can be much thinner than steel-reinforced concrete
To the linear variable displacement transducer (LVDT), an optical deformation measurement system was used in order to be able to analyse the individual crack widths and the crack development over the entire test time.For this purpose, the ARAMIS System was used
Summary
Due to its specific properties Textile Reinforced Concrete (TRC) can be used for purposes ranging from the strengthening of existing structures to new load bearing constructions. TRC has a higher crack distribution ability than steel reinforced concrete. When it cracks, the crack distribution is finer; the cracks are thinner, making TRC especially suitable for the repair of cracked building structures. The textile reinforcement (see Fig. 1, ) embedded in the mortar/concrete allows the realization of a thin reinforced layer and ensures that the crack width opening Δwop of the substrate crack can be bridged and is distributed over several cracks with single crack widths wi < 0.1 mm in the TRC (see Fig. 1.). In the context of these studies, the influence of the reinforcement type as well as the reinforcement ratio and test direction of the textile reinforcement in combination with a commercially available repair mortar were investigated.
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