In recent years, textile reinforced concrete (TRC) is at the beginning of industrial production mainly in Germany and relates especially to facade panels and concrete footbridges. The subtle panels with a minimum thickness of coverage layer can be designed due to the textile reinforcement, which is resistant to corrosion. Furthermore, a long durability is expected in case of these structures. The textile reinforcement with the fine-grained ultra-high performance concrete (UHPC) enables to produce concrete elements with a minimum thickness. Therefore, the concrete element with up to 70 % lower weight compared to element with conventional reinforcement can be produced and significant environmental savings can be achieved (reducing the consumption of non-renewable raw materials, transport energy, reduced dead load acting on the supporting structure, etc.).
The reinforcement of concrete with composite technical textile creates a tensile load-bearing capacity. It allows the elimination of steel reinforcement and minimisation of concrete cover. Based on this, the concrete cover is designed with respect to the cohesion of reinforcement with concrete. By using of textile reinforcement very thin structures could be created. The aim of this paper was to determine the interaction conditions of carbon and basalt composite reinforcement in a matrix of epoxy resin with high performance concrete (HPC). The tensile strength of used composite reinforcement and the other mechanical parameters of HPC were determined by experimental tests. Experiments copied the production method of technical textiles. These two combinations of materials present the influence on the design of the structures with textile reinforcements.
Demand for very thin concrete elements, which can’t be reinforced with usually used steel reinforcement, gave rise to a new type of non-traditional reinforcement with technical textiles in matrix of epoxy resin. This type of reinforcement together with concrete is called textile reinforced concrete (TRC). Composite reinforcement is very chemically resistant, so the concrete cover is proposed to regard the durability. It allows a significant saving of concrete and design of thinner elements. For TRC structures is used high performance concrete (HPC) with its fine grained structure and high compressive strength. Textile reinforcement and TRC in general are developed at the Faculty of Civil Engineering and the Klokner Institute, CTU in Prague.
Mechanical properties of high performance concrete (HPC) enable design of subtle structural elements. Subtle HPC frame concept comes from the effort to integrate load bearing elements into building envelope in order to reduce risks of thermal bridges. Substantial advantages of subtle structural elements are material and energy savings during production, transportation, manipulation and assembling.
Paper presents preparation and implementation of construction of experimental frame at University Centre UCEEB in Buštěhrad. Individual structural elements were made in prefa plant ŽPSV a.s. in Litice nad Orlicí. Construction of frame prototype is the result of long term research when the vertical and horizontal structural elements and their connections were successively designed and experimentally verified. This article shows experimental results of horizontal load bearing structures - floor panels and beams - in detail. Samples were tested by four-point bending test and also creep of floor panels was measured.
Accomplished calculations, experimental verification and analysis have showed that subtle HPC frame is the effective solution from reliability aspects as well as from environmental and economical parameters. Minimal columns cross sections enable their complete implementation into building envelope and they also contribute to high quality architectonic solution of buildings interiors.
In civil engineering, steel reinforced concrete is currently still the most widely used composite material. For broad spectrum of utilization is the most important combination of a high compressive and tensile strength [1]. The increasing demand for subtle concrete elements gave impetus to the development of the new materials for the reinforcement of concrete which are non-corrodible and thus do not need such a thick coating layer-technical textiles. These composite materials are known under the title Textile Reinforced Concrete – TRC. The current research reported the use of AR glass fibers reinforced material for HPC and comparison with other reinforced materials.
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