Jakub Řepka

Jakub Řepka
Czech Technical University in Prague | ČVUT · University Centre of Energy efficient buildings

Master of Engineering

About

24
Publications
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26
Citations

Publications

Publications (24)
Article
Full-text available
Textile-reinforced concrete (TRC) is a new composite material comprising high-performance concrete and textile reinforcement from textile yarns with a matrix, usually consisting of epoxy resins (ER). The most significant advantage of ER is the homogenization of all filaments in the yarn and full utilization of its tensile potential. Nevertheless, E...
Article
Full-text available
The use of recycled aggregate concrete is mainly negatively affected by its poorer mechanical and long-term properties. However, there are few structural applications for which recycled aggregates can be used. In this case study, the possibility of use as massive external reinforcement wall is verified. For this structural application, the most imp...
Article
Full-text available
Concrete containing primary raw resources such as sand and gravel can be replaced by recycled aggregate concretes (RAC). But recycling processes are energy-consuming and thus energy resources are consumed. To investigate the resource consumption and overall environmental impact related to the life cycle of RAC, Life Cycle Assessment (LCA) was used...
Article
Full-text available
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 (c...
Conference Paper
This paper presents the results of loading tests of subtle thin panels made of high-performance concrete. The panels are reinforced on one side with a visible carbon fabric pre-impregnated with epoxy resin. The purpose of this experiment is to compare the load-bearing capacity of the panels with carbon fabrics on the surface with the traditional co...
Conference Paper
The main aim of this paper was to optimize recycled aggregate concrete mixture with recycled masonry aggregate for structural utilization to find an efficient way of construction and demolition waste utilization. This paper presents the characteristics of recycled masonry aggregate and recycled masonry aggregate concrete. The concrete mixtures were...
Conference Paper
This paper presents research results of recycled aggregate concrete testing. The main aim of this contribution is the verification of physical and mechanical properties and durability of concretes where natural aggregate is replaced by recycled masonry aggregate originated from construction and demolition waste. The mixtures contain various amount...
Conference Paper
This paper deals with the current issue of the use of waste materials in high-performance concrete. Specifically, this work investigates waste glass from photovoltaic panels, which is examined in terms of chemical composition, optimization of concrete mixture, experimental verification of mechanical properties and durability of concrete mixtures, a...
Article
Full-text available
The use of recycled masonry aggregate for concrete is mostly limited by the worse properties in comparison with natural aggregate. For these reasons it is necessary to find ways to improve the quality of recycled masonry aggregate concrete and make it more durable. One possibility is utilization of crystalline admixture which was verified in this s...
Article
Full-text available
The development of light and very thin concrete building structures and demand for extremely thin elements in design are inter alia reasons for the development of composite materials as non-traditional reinforcement. Composite materials are currently used as reinforcement mostly in the form of fiber reinforced polymer bars similar to traditional st...
Article
Full-text available
This paper discusses the feasibility of an innovative anchoring element which is designed to be integrated into the volume of an ultra-thin coffered façade panel made of textile reinforced concrete and to not increase its external dimensions. The first part of the article describes the composition and shape of the façade panel and focuses on the ma...
Conference Paper
This paper presents an innovative approach to the production of thin-walled HPC elements, with a particular focus on ultra-thin horizontally oriented slabs subjected primarily to uniaxial bending. It is a technology designed primarily for design furniture elements such as table tops, counter tops and shelves. The technology consists of casting a th...
Conference Paper
This paper presents design, numerical model and experimental verification of thin and durable textile reinforced concrete bench. Bench construction was divide into two parts. Bottom part was an in-visible slab 60 mm below ground with thickness 100 mm and it was made from ordinary concrete with traditional steel reinforcement. Upper visible part was...
Article
Full-text available
This paper presents an experimental verification of impregnated textile reinforcement splicing by overlapping using tensile test of small textile reinforced concrete slabs before its using in the product. The specimen dimensions were designed 80×360mm and thickness approximately 18 mm. This specimen was reinforced using two pieces of impregnated fl...
Article
Full-text available
This paper presents the possibilities of an innovative and aesthetic solution of furniture from concrete for railway stations. At present, the railways in the Czech Republic undergo significant changes. Due to automation and centralization there is a lot of stations without permanent staff. Thus the need for railway station furniture, that exhibits...
Article
Full-text available
Benefit of textile reinforced concrete (TRC) is absent of necessary concrete cover because of the durabulity. It allows creating concrete slabs only about 10 mm thick. Therefore, TRC going to be very popular, and more often used in design and load-bearing structures. Big problem in designing of load-bearing structures are rigid frames. The aim of t...
Article
Full-text available
This paper describes the utilization of vacuum-formed plastic membranes for the production of lightened panels made of high-performance concrete with technical textile reinforcement. The use of vacuum-formed plastic membranes is aimed to reduce the cost and increase the efficiency of production of concrete elements with highly profiled surface. Stu...
Article
Full-text available
This article deals with the test of selected adhesives for glued connection of high performance concrete and steel plates with various surface treatments. Results of this experiment can be used as a basis for the possible anchoring of concrete facade elements to the steel grate, the possible bonding of steel anchors on the surface of concrete facad...
Article
The mixture of ultra-high performance concrete is often supplemented by steel fibres which can significantly improve the fracture energy of the concrete. The incorporation of steel fibres results in especially a significant increase of tensile strength and minimize the risk of brittle failure. However, these positive properties can be fully realise...
Article
This paper presents the simplified method of efficiency evaluation of surface protection products for concrete elements. This evaluation method was designed to consist of as few testing procedures as possible and to use as few specimens as well. Several testing processes most of which were based on the European technical standards were used to comp...
Article
This contribution is to verify the utilization of waste glass as partial replacement of fine aggregate for high performance concrete (HPC). Test results of fresh and hardened HPC will be presented. This study has been conducted through basic experimental research in order to analyze the possibilities of recycling waste glasses (grinding glass, mill...
Article
High performance concrete reinforced by technical textiles has found a wide range of applications in recent years. One of the most widespread is the use of this composite for the very thin facade panels of various shapes and technical solutions. This paper presents an unique way how to lighten the facade panels made of high performance concrete (HP...
Article
This paper presents a model of small experimental facade panel using four-point bending test. The facade panel with dimensions 100 x 360 mm and thickness approximately 18 mm was slightly reinforced using two layers of impregnated technical fabric from AR-glass roving. The amount of reinforcement in cross-sectional area of the concrete element is sm...
Article
Full-text available
Use of high performance concrete with reinforcement made of technical textile is increasing and new applications are being found. This paper presents new technology for the lightening of the panels made of textile reinforced concrete, which is being developed. The main focus of this research is to produce concrete elements suitable for use as facad...

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