Abstract
Textile-reinforced concrete (TRC) is a material consisting of high-performance concrete (HPC) and tensile reinforcement comprised of carbon roving with epoxy resin matrix. However, the problem of low epoxy resin resistance at higher temperatures persists. In this work, an alternative to the epoxy resin matrix, a non-combustible cement suspension (cement milk) which has proven stability at elevated temperatures, was evaluated. In the first part of the work, microscopic research was carried out to determine the distribution of particle sizes in the cement suspension. Subsequently, five series of plate samples differing in the type of cement and the method of textile reinforcement saturation were designed and prepared. Mechanical experiments (four-point bending tests) were carried out to verify the properties of each sample type. It was found that the highest efficiency of carbon roving saturation was achieved by using finer ground cement (CEM 52.5) and the pressure saturation method. Moreover, this solution also exhibited the best results in the four-point bending test. Finally, the use of CEM 52.5 in the cement matrix appears to be a feasible variant for TRC constructions that could overcome problems with its low temperature resistance.
Highlights
Introduction iationsTextile-reinforced concrete (TRC) is a construction material currently used for non-load bearing structures [1,2,3,4,5] and facade panels, but it could potentially be used in load-bearing construction elements [6,7]
Fire experiments showed that the load-bearing capacity of TRC at elevated temperatures depends on the interaction between the textile reinforcement and high-performance concrete (HPC)
Since epoxy resins used in this variant of TRC have low resistance to higher temperatures [10,11,12,13], this study focused on the identification of an alternative available material for the homogenization of textile reinforcement before installation in concrete
Summary
Introduction iationsTextile-reinforced concrete (TRC) is a construction material currently used for non-load bearing structures [1,2,3,4,5] and facade panels, but it could potentially be used in load-bearing construction elements [6,7]. In load-bearing structures, marginal TRC application issues arise from the ability to withstand high temperatures during fire. In previous work the main weakness of TRC was identified as the behavior of the homogenized carbon-fiber reinforcement with epoxy resin matrix at elevated temperatures [8,9]. Fire experiments showed that the load-bearing capacity of TRC at elevated temperatures depends on the interaction between the textile reinforcement and high-performance concrete (HPC). Since epoxy resins used in this variant of TRC have low resistance to higher temperatures [10,11,12,13], this study focused on the identification of an alternative available material for the homogenization of textile reinforcement before installation in concrete
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