Acta Polytechnica CTU Proceedings. 2022 ( vol. 32-39): Poslední příspěvky
Zobrazují se záznamy 221-240 z 290
-
Mechanical and durability performance of cementitious matrices with low cement and different additions
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Nowadays, the decarbonization of the concrete sector is a priority to counteract the global environmental harmful. Knowing that Portland cement is responsible for significant anthropogenic emissions worldwide, the optimization ... -
Methodology for evaluation of the life cycle of buildings with a focus on the private sector
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper describes the innovative methodology for the evaluation of the life cycle of buildings, which will be used in construction projects of Skanska, or other construction companies, in selecting the optimal solution ... -
Environmental assessment of non-metallic reinforcement for concrete structures as an alternative to steel reinforcement
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The concrete industry accounts for a significant amount of CO2 emissions worldwide. One approach to counter this issue includes material reduction of structural components via the use of non-metallic reinforcement, such ... -
Load transfer mechanism of concrete screws
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Even though the market and development for concrete screws has been increasingly rising in recent years, the load transfer mechanism of concrete screws has not yet been fully investigated. Therefore, different tests of ... -
Concrete admixtures - sustainable concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Durability of concrete, an important part of the sustainability theme, was, is, and will be one of the main topics for large infrastructure projects like the Gotthard base tunnel. For such important structures a service ... -
Fracture behavior of multiple adhesive postinstalled anchors subjected to shear force
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this study, experiments were conducted on post-installed anchors subjected to shear force in order to enhance applicability when post-installed anchors were used for seismic reinforcement. Furthermore, since there were ... -
Use of recycled concrete fines in cement and as aggregate
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The research project focused on investigating and optimizing the processing and use of recycled crushed sand 0/4 from concrete demolition waste, as an alternative raw material in the cement and concrete industry. Crushed ... -
Influence of oxygen and argon plasma treatment on wettability and surface morphology of polypropylene microfibers
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The surface treatment of polypropylene microfibers by plasma processing in oxygen and argon was studied with the motivation to increase their cohesion with the cement matrix. By plasma treatment, it is possible to modify ... -
Sustainability of concrete pavements considering traffic and de-icing agents
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In concrete pavements, special conditions, that increase the likeliness of damaging reactions, as for example an alkali-silica reaction (ASR), prevail. Especially to the superposition of microstructural degradation caused ... -
Thermal properties of mineral wool insulation recovered from construction and demolition waste
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Mineral wool is one of the most commonly used types of thermal insulation in the European Union at the present, however, it generates massive amounts of waste. From an environmental standpoint, recycling or reuse of ... -
Forced carbonation of recycled concrete aggregates
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The production of concrete, especially the contained cement clinker, causes a high proportion of the manmade gaseous air pollution. Studies show that the decarbonation of limestone effects roughly 8% of worldwide CO2 ... -
Behavior of predried mature concrete beams subject to partial wetting and drying cycles
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The presented research focuses on the behavior of predried concrete beams with 2.5 m span subjected to cycles of nonsymmetric wetting and drying. Wetting is induced by partially immersing the specimens in a water basin. ... -
Parapet structure from special shaped TRC blocks
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper describes innovative parapet solution based on special shaped blocks made form textile-reinforced concrete - TRC. The blocks are designed for a placement at the parapet of building with a flat roof. The solution ... -
A modular extension of a finite element contact implementation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The structural mechanics module of the OOFEM finite element software has been developed to include various algorithms for solving contact mechanics problems. After developing small strain contact algorithms in the 2D domain ... -
Research focused on low carbonation of concrete under old cement-based render
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In-situ research and laboratory study of the concrete of old bridges shows that despite the low strength classes of concrete and the long time of exposure to CO2, it is possible to moderate the depth of their carbonation. ... -
Dowels effectiveness investigation between ultra high performance fiber reinforced concrete and reinforced concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In the present study, the performance of Reinforced Concrete (RC) beams which were strengthened with Ultra High Performance Fiber Reinforced Concrete (UHPFRC) and dowels at the interface was investigated. RC beams with a ... -
Influence of microstructure on rate-dependent response of unidirectional fibrous composites
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper outlines prediction of the macroscopic response of unidirectional fibrous composites made either from basalt or carbon fibers impregnated by a polymeric epoxy matrix. The viscoelastic response of the matrix phase ... -
New possibilities for recycling of mineral wool separated from thermal insulation waste
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)It has become increasingly clear, that the recent consumption of mineral resources is unsustainable. The Czech Republic produces more than 217,000 tones of mineral wool annually, while its recycling stays unacceptably ... -
Steel elements with timber fire protection - experiment and numerical analysis
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Steel structural elements are sensitive to elevated temperatures, while timber elements have good thermal insulation properties. Timber material can fulfill the role of fire protection of steel members. The effect of the ... -
Finite element simulation of shear and compact tension tests on timber
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The non-linear finite element simulation of the ASTM shear and pre-stressed compact tension tests was conducted. Tested specimens were cut from the glued laminated timber made of European spruce (Picea abies) with the ...