Prohlížení Acta Polytechnica CTU Proceedings. 2019, vol. 22 dle názvu
Zobrazují se záznamy 7-26 z 27
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EFFECTS OF ABRASIVES DURING ACCELERATED SIMULATION OF MECHANICAL CORROSION OF CEMENT COMPOSITES USING ABRASIVE WATER FLOW
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The paper deals with the use of the abrasive water flow technology in an accelerated simulation of the process of mechanical degradation of surface layers of cement-based composites by flowing liquids. Effects of the ... -
ELECTRICAL PROPERTIES OF FLY ASH GEOPOLYMER COMPOSITES WITH GRAPHITE CONDUCTIVE ADMIXTURES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Construction materials with increased electrical conductivity could be possibly used in health monitoring of structures (stress, deformation, damages), their maintenance or traffic monitoring. The aim of this study was the ... -
EXPERIMENTAL ANALYSIS FOCUSED ON THE MATERIAL CHARACTERISTICS OF THE CEMENT-BASED POLYMER-MODIFIED MORTARS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The article deals with the experimental analysis focused on the development of the physical and mechanical characteristics of the cement-based polymer-modified mortars (PCM) during ageing. Two different commercial products ... -
EXPERIMENTAL STUDIES OF ACCELERATED CHLORIDE TRANSPORT IN CONCRETE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This contribution deals with the efficiency of electromigration of chlorides used as a repair method for reinforced concrete structures. Experimental studies of accelerated chloride transport tests were performed on samples ... -
EXPERIMENTAL VERIFICATION OF IMPREGNATED TEXTILE REINFORCEMENT SPLICING BY OVERLAPPING
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)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 ... -
FRESH STATE PROPERTIES OF LIME MORTARS WITH FLAX OIL ADMIXTURE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Flax oil has been used as mortar improving, hydrophobic, admixture already in ancient times. The paper describes the identification of flax oil in mosaic mortar from ca. 1900 by help of FTIR spectroscopy. This historic ... -
INFLUENCE OF CORUNDUM AS COARSE AGGREGATE IN HIGH-PERFORMANCE CONCRETE ON PROJECTILE IMPACT RESISTANCE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The aim of this paper is focused on the influence of corundum as coarse aggregate in high-performance concrete on projectile impact resistance in terms of depth of penetration and size of the crater. Based on the experimental ... -
LIGHTWEIGHT UHPC FACADE PANEL WITH LED DISPLAY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This article deals with the development of lightweight UHPC facade panel which also can serve as an LED display. Combining both functions into one gives the potential ability to create a LED display on the facade of the ... -
MECHANICAL PROPERTIES IMPROVEMENT OF FIBER REINFORCED CONCRETE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Fiber reinforced concrete mechanical properties are limited due to low adhesion between polymer fibers and cement matrix. To ensure a strong interaction between the two materials, polypropylene fibers (d = 0.305mm) were ... -
MONITORING AND PROTECTION OF TIMBER-CONCRETE BRIDGES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The majority of timber bridges for ordinary road traffic are often made as timber-concrete composite structures. Concrete slab is something like as umbrella for timber. The reason for problems in timber-concrete bridges ... -
OPTIMIZATION OF MIX-DESIGN OF CHEMICALLY RESISTANT SPRAYED CONCRETE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This paper addresses optimization of mix-design and granulometric curves of aggregate of chemically resistant cementitious sprayed mix. The target of the paper is to improve properties of currently developed mix-design, ... -
PHYSICAL-MECHANICAL PROPERTIES AND DURABILITY OF HYDRAULIC LIME-BASED MORTARS WITH NON-TRADITIONAL BIOPOLYMERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The study focuses on the influence of addition of four different biopolymers in various doses (0.1%, 0.5%, and 1%) on the physical-mechanical properties and durability of NHL 3.5 mortars prepared with constant water/binder ... -
RECYCLING OF CONSTRUCTION WASTE USING HIGH-SPEED MILLING PROCESS: DETERMINATION OF WASTE CONCRETE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This paper deals with the use of high-speed milling process for recycling old concrete and direct determination of the potential of input waste. For this purpose, three different types of waste concrete were used: prefabricated ... -
SHORT-TERM CORROSION RESPONSE OF METALS IN LIME MORTAR
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Even though the corrosion of steel in concrete is very well described, the corrosion processes in lime environment studied very rarely. This environment is obviously also basic and its pH decreases in time, but the obtained ... -
THE FATIGUE BEHAVIOUR OF GFRP BARS - EXPERIMENTAL STUDY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The paper describes an experimental program for studying the fatigue performance of GFRP bars, which has been initiated by the authors. Two different test configurations were used to assess the fatigue behaviour. The bare ... -
THE INFLUENCE OF A SHRINKAGE REDUCING ADMIXTURE ON THE LONG-TERM DEVELOPMENT OF DYNAMIC PROPERTIES IN ALKALI-ACTIVATED SLAG
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The paper investigates the way a shrinkage-reducing admixture affects the long-term development of dynamic properties in mortars made with alkali-activated slag (AAS). Two AAS mortars were tested - one contained a ... -
THE LIGHTWEIGHT TEXTILE REINFORCED CONCRETE FOR THIN-WALLED STRUCTURES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The article deals with lightweight concrete with non-conventional reinforcement and its application in thin-walled structures. As part of experimental research, several sets of thin-walled slab and complementary specimen ... -
THE PHYSICAL PROPERTIES OF CEMENTITIOUS COMPOSITES FOR APPLICATIONS IN A HIGH-TEMPERATURE ENERGY STORAGE DEVICE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The article was focused on experimental verification of the identification of thermal characteristics of high-performance cementitious composites at elevated temperatures. The purpose of the research was to verify the ... -
THE USE OF LIGHTWEIGHT AGGREGATE IN PREPARATION OF THERMAL INSULATION LIME-BASED RENDERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Lime-based renders are common part of historical or older buildings that don’t always provide a comfortable inside climate due to the problems with high thermal losses. Thermal insulation renders may possibly retrofit or ... -
USING SECONDARY RAW MATERIALS IN LIGHTWEIGHT OPEN-STRUCTURE CONCRETE WITH GOOD UTILITY PROPERTIES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The paper presents the results of research in lightweight concrete with open structure made using a lightweight porous foam-glass aggregate produced from recycled glass powder. The goal was to develop lightweight concrete. ...