Acta Polytechnica CTU Proceedings. 2022, vol. 33
Zobrazují se záznamy 21-40 z 98
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Suggestion of ultimate strength formulas of partial frame pile cap composed of exterior column, foundation beam and pile
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Currently, there is no research and few valid experiments of pile caps. And shear failure mechanism of a pile, exterior column and foundation beam and pile caps in RC structure is not resolved yet under bi-lateral loading. ... -
Chloride ion penetration behaviour in concrete containing an expansive additive and a calcium-aluminate-based additive
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The effect of the material characteristics on the infiltration behaviour of chloride ions in concrete containing a combination of an expansive additive and a calcium-aluminate-based additive has been investigated. The same ... -
Technical effectiveness of cement-based mortar for high-reflective building envelope through building energy simulations: preliminary results
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In areas with high levels of solar radiation, decreasing the amount of solar energy absorbed by the building envelope is useful to reduce the need of air conditioning and "heat island" effects. Most high-reflective products, ... -
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 ... -
A new performance test to evaluate the sulfate resistance of concrete by tensile strength measurements
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Concrete structures without sufficient durability can be damaged by sulfates in groundwater and from surrounding rock layers. To evaluate the performance of a concrete mixture, precise and performance-oriented test methods ... -
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 ... -
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 ... -
The role of conceptualization in the evaluation of sustainable concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Improvement of the sustainability of concrete materials will be realized through the development of analytical tools that facilitate sustainable design and evaluation. However, these processes may be dependent on how ... -
Benefits of pervious concrete for urbanized habitats
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Pervious (draining) concrete is a new generation concrete which, for its structure, allows rainwater to enter the subsoil and at the same time is determining the final surface without the need for any additional layer. ... -
Bending behavior of adhesively-bonded engineered wood-concrete composite decks
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Four-point bending tests were conducted on five medium-sized (i.e., 2300 mm in length and 215 mm in width) engineered timber (laminated veneer lumber (LVL) and cross-laminated timber (CLT)) - concrete (wood chip concrete ... -
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 ... -
Advanced hybrid nonmetallic composite reinforcement for concrete structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)During the last decades, fiber reinforced polymer (FRP) reinforcing bars for concrete structure has been extensively investigated and a number of FRP bars became commercially available. However, major shortcomings of the ... -
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 ... -
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 ... -
Limitations of life cycle assessment of green concretes - a state-of-the-art review
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)There have been numerous researches focusing on the alternatives to conventional concrete regarding environmental benefits and trade-offs. For this purpose, nowadays, the Life Cycle Assessment (LCA) is widely used. Until ... -
RC deck - stiffened arch existing bridges: simulated design and structural analysis
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The 20th century is known as the age that gave birth to the largest reinforced concrete structures. Many applications of this new material were realized at that time, both from a theoretical and practical point of view. ... -
High thermal conductivity concrete for energy piles
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Research is increasingly focusing on thermal properties of concrete with the aim of reducing the heat exchange between buildings and environment. On the other hand, concretes with high thermal conductivity could have ... -
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 ... -
Analyzing the impact of the aspect ratio of a building on concrete use in its structure
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Buildings consume over half of annual energy supply as embodied and operating energy in their construction and operation releasing harmful emissions to the atmosphere. Over 90 % of the embodied energy is attributed to ... -
Circular concrete: validating new technologies in the lab and on-site
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The growing importance of a circular economy also holds possibilities for concrete. Some of the principles of circularity, like the re-use of "waste" as secondary raw material and the optimisation of the design with regards ...
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