Prohlížení Acta Polytechnica CTU Proceedings. 2022, vol. 33 dle názvu
Zobrazují se záznamy 22-41 z 98
-
Correlation of porosity and properties of recycled fine aggregate concrete with fly ash
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this paper, we presented the experimental discussion of samples of recycled aggregate concrete with replacement of natural fine aggregate by recycled fine aggregate. Three mix kinds were produced and, for each of these ... -
Critical assessment of CO2 emission of different concretes: foamed, lightweight aggregate, recycled and ordinary concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Construction materials contribute to about 75% of the CO2 emission of all the construction processes. Concrete is one of the most widely used construction materials and is thus primarily responsible for CO2 emission. In ... -
Determination of in-situ concrete compressive strength under consideration of rearrangement effects
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)For the design of existing structures the concrete compressive strength and the derived mechanical parameters are of central importance. Due to safety reasons the compressive strength of existing concrete is usually set ... -
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 ... -
Durability evaluation of surface softened steel bar for prestressed concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The effects of Si addition and surface softening on delayed fracture susceptibility were evaluated in tempered martensitic steels with tensile strength of 1450 MPa. The delayed fracture susceptibility was reduced when Si ... -
Durability of GFRP connectors under sustained compression load for use in sandwich walls
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Precast concrete sandwich panels are used to fulfil the rising thermal requirements. The sandwich walls consist of three layers, a facing, a thermal insulation layer, and a load bearing layer. The two outer layers are ... -
Durability of high belite cement as new technical solution for concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The study presents an investigation on the durability performance of concretes produced with an industrial scale high belite cement. This binder, thanks to the high amount of C-S-H gel and the lower C3S/C2S ratio, is ... -
Effect of cracks on the service life of RC structures exposed to chlorides
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)To move towards a more sustainable concrete, the enhancement of its durability is strongly encouraged and, dealing in particular with reinforced concrete (RC), this mainly means to prevent the damage due to environmental ... -
Effect of superplasticizer on the strength of fly ash based geopolymer concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this research, the effect of a polycarboxylate based superplasticizer on the strength of Geopolymer Concrete (GPC) was investigated. A fixed amount of superplasticizer (1.5 % of Fly Ash weight) was utilized along with ... -
Effect of TiO2 and ZnO powder mixtures on mechanical and photocatalytic performance of high performance concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The development of new modified cement-based materials is increasingly becoming a necessity for improving the durability and surface performance of building materials. Titanium dioxide (TiO2) photocatalyst has been widely ... -
Effect of using biomass fly ash on the concrete sustainability
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Biomass fly ash has been studied has a partial cement material, since this material has a positive effect on concrete properties. Even though, some mixes with BFA presents a positive benefit, they need to be economically ... -
Energy flows along the production and use of secondary materials with a special focus on concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Urban mining in the existing building stock can contribute to securing raw materials and conserving natural resources if the potential of recycling construction waste is consistently exploited. From an ecological point of ... -
Engineering properties of geopolymer concrete: a review
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Geopolymer concrete (GPC) could be a solution that uses a cementless binder and recycled materials for producing concrete, while reducing the carbon dioxide emission and the demand for raw materials. In addition to the ... -
Enhanced service life of existing infrastructure buildings by use of concrete screw anchors as post-installed shear reinforcement
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In the last decades, traffic on railways and roads has increased significantly in Central Europe. On the other hand, the existing infrastructure mainly origins from the late 1950s to the 1970s. This applies also for the ... -
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 ... -
Environmental impacts of using desalinated water in concrete production in areas affected by freshwater scarcity
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Up to 500 litres of water may be consumed at the batching plant per cubic meter of ready mix concrete, if water for washing mixing trucks and equipment is included. Demand for concrete is growing almost everywhere, regardless ... -
Equivalent thermal diffusivity of natural and recycled aggregate concrete at temperature up to 350 ⁰C
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper presents the evolution of equivalent thermal diffusivity with temperature of concretes with natural coarse aggregates and recycled concrete aggregates. Thermal diffusivity was evaluated based on the temperature ... -
Expansion of sustainability in the ACI 318 building code
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The American Concrete Institute (ACI) has long recognized the growing importance of accounting for environmental sustainability in the design of concrete structures. As the next version of the ACI 318 Building Code is being ... -
Experimental investigation on the mechanical behaviour of AAC blocks for sustainable concrete masonry
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)To satisfy the increasing demand of energy efficient buildings, AAC manufacturers are nowadays encouraged to produce blocks with ever lower densities. However, a compromise between energy-saving requirements and mechanical ... -
Extent of corrosion damage for RC structures exposed to chloride-bearing environment
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In industrialized countries, most of the reinforced concrete (RC) structures and infrastructures have more than 40 years, since they were built around 1960 − 1980, and were designed for a service life of 50 years. Consequently, ...