Prohlížení Acta Polytechnica CTU Proceedings. 2022, vol. 33 dle názvu
Zobrazují se záznamy 28-47 z 98
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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, ... -
Feasibility experiments of seismic concrete block walls without joint mortar
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The authors developed two types of block systems consisting only of main block and key block without joint mortar in consideration of seismic performance and workability. Two types of block systems have different key block ... -
Fire spalling sensitivity of concrete made with recycled concrete aggregates (RCA)
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The fire spalling of concrete is a complex phenomenon, which can affect the integrity of the structures during a fire. This thermal instability is associated with a complex coupled chemo-thermo-hydro-mechanical mechanism ... -
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 ... -
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 ... -
Fundamental properties and durability of slope protection spray mortar reinforced with bamboo fibers
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In order to enhance resistance against cracking and durability, short fibers such as steel and organic fibers have been conventionally mixed into spray mortar used for slope protection. In this research, fundamental ... -
Glued timber concrete composite walls using ultra-high-performance concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper gives a short introduction of the development of cross laminated timber (CLT) concrete composite walls with a glued connection. In the composite walls, prefabricated ultra-high-performance concrete (UHPC) lamellas ...