Procházení Acta Polytechnica CTU Proceedings. 2022, vol. 34 dle data publikování
Zobrazují se záznamy 1-20 z 24
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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 ... -
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 ... -
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. ... -
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 ... -
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 ... -
Sulphate corrosion of cement pastes with a high content of waste marble powder
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The article focuses on sulphate corrosion of cement pastes with a high content of waste micronized marble powder. Micronized marble powder is used as a substitute for Portland cement CEM I 42.5R. The amount of micronized ... -
Phase-field damage of laminated glass in explicit dynamics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Laminated glass is aesthetic but also functional modern material, which has spread from the automotive industry to the civil engineering in the form of design as well as structural elements. Proper design of this material ... -
Mesh generation and mechanical tests of basic element cells of porous structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Advanced porous structures are novel, emerging materials with a broad range of applicability but a rather difficult means of design and manufacturing. The advent and availability of the additive manufacturing industry in ... -
Generation of mesostructure for lattice discrete particle model
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A preliminary study of two approaches for the internal structure generation utilized in the lattice discrete particle models (LDPM) [1] is presented. The presented methods used for particle generation and placement are ... -
Detection of the presence of microorganisms during production of plasterboard
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The article introduces possibility how to use special material from plasterboard back to the production of plasterboards. The recycled material was prepared from standard plasterboards KNAUF WHITE (it means plasterboard ... -
Comparison of FETI-based domain decomposition methods for topology optimization problems
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We critically assess the performance of several variants of dual and dual-primal domain decomposition strategies in problems with fixed subdomain partitioning and high heterogeneity in stiffness coefficients typically ... -
Environmental perspectives of fine grounded concrete powder: LCA case study of light-weight concrete block
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The construction elements produced with low demand for primary resources are being developed in the building industry. However, not only consumption of primary resources but also environmental impacts of such products ... -
The effect of sampling volume size on the apparent stiffness of jointed rock mass
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Overall mechanical properties of a jointed rock mass are strongly affected by discontinuities – fractures – that naturally occur in rocks. Stochastically-generated discrete fracture network (DFN) modeling, which uses a ... -
Determination of water absorption coefficient of unfired earth materials different in used clay and ratio of components
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper is focused on unfired rammed earth and its water absorption properties. Increasing the utilization of raw natural materials can be one of the approaches towards sustainable development. Different prescriptions ... -
Microstructure reconstruction via artificial neural networks: a combination of causal and non-causal approach
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We investigate the applicability of artificial neural networks (ANNs) in reconstructing a sample image of a sponge-like microstructure. We propose to reconstruct the image by predicting the phase of the current pixel based ... -
Benchmark VERCORS 2022: mechanical response of the prestressed concrete containment wall to ambient conditions
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The VERCORS benchmark was developed to provide a solid experimental basis for numerical modeling of concrete containment buildings (CCBs) to extend their lifespan. The goal of the first phase of the third benchmark is to ... -
Heat transfer model verification for thermal monitoring system of integral bridges
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Thermal actions considered on abutments of integral bridges by the European standard (Eurocode 1) might be in variety of certain situations underestimated. Based on this assumption, thermal monitoring system has been ...