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Analysis of the Punching Shear Resistance of Reinforced Recycled Aggregate Concrete Slabs According to Various Standards
Fecko, Tadeáš ; Halvonik, Jaroslav
This paper presents an analysis of the punching shear resistance of reinforced recycled aggregate concrete slabs. This work mentions several papers focusing on recycled aggregate concrete slabs. Punching shear resistance is assessed according to three design approaches based on standards. This article also describes the design of an experimental programme for the testing of reinforced concrete flat slabs from recycled aggregate concrete. A comparison of the results of analytical calculations and experiments shows that the most accurate design code was the second generation of Eurocode 2 and Model code 2010 with an updated failure criterion when the mean values of the ratio Vtest /Vcalc reached 1.15 and 1.14 respectively. On the other hand, the design code followed by Eurocode 2 provided results with higher safety when the Vtest /Vcalc ratio was 1.41
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A study of the possibilities of using recycled concrete in the UAE for the production of structural concrete
Lakomá, Karolína ; Novosad, Petr (referee) ; Hela, Rudolf (advisor)
The thesis focuses on verifying the possibilities of utilizing recycled concrete aggregates originating from demolitions in the United Arab Emirates (UAE) in structural concretes for ready-mix concrete technologies. The theoretical part summarizes knowledge in the field of recycled concrete aggregates, their preparation, and production. It outlines the standard requirements for the UAE, the Czech Republic and globally. Additionally, it describes the influences of recycled aggregates on fresh and hardened concrete. The goal of the experimental section was to verify the resulting properties of natural and recycled aggregates. Moreover, the thesis addresses the formulation design for reference and recycled concretes. Tests for both fresh and hardened concrete were conducted based on these formulations. This work compares the achieved results with those obtained in another study from the Czech Republic which is also focused on the use of recycled concrete. Furthermore, an economic analysis comparing the prices of reference and recycled concretes on 1 m3 is conducted within the experimental section.
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Inclined belt conveyor of aggregates
Zavadil, Milan ; Malášek, Jiří (referee) ; Škopán, Miroslav (advisor)
The aim of this work is the design of helical conveyor belt for transport of building stone and recycled aggregate with a maximum grain size of 150 mm. Work includes a characteristic of some parts of the conveyor functional calculation, determine the key dimensions and design of power according to ISO 5048. Further strength calculation was carried out certain parts of the conveyor and assembly drawn in overall conveyor subassembly and stretching equipment.
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Possibilities of using recycled aggregates for the production of structural concrete
Hrachovcová, Ludmila ; Brožovský, Jiří (referee) ; Hubáček, Adam (advisor)
The bachelor thesis deals with the study of recycled aggregates and concretes made from them. Nowadays, more and more emphasis is being placed on recycling waste and especially construction and demolition waste. Therefore, we are looking for ways to use recycled aggregates in concrete composites despite heterogeneous parametres of concrete and brick recyclates. The paper summarizes the existing knowledge about recycled aggregates, especially about brick and concrete recyclates, their parameters and possibilities of their use. Furthermore, the thesis deals with brick and concrete recyclate concretes, their parameters and behaviour and their subsequent use in practice.
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Circular economics in construction
Tatarin, Tomáš ; Marek, Martin (referee) ; Krejza, Zdeněk (advisor)
The goal of this bachelor thesis Circular Economy in Construction is to map the sources of primary raw materials and the production of recyclates in the context of construction production and to perform a price and geographical analysis. The extension of the principles of circular economy is set in the context of the now widespread linear economy. The bachelor thesis is divided into two parts. The theoretical part deals with the analysis of the circular economy and the possibilities of recycling construction waste. The practical part then analyses the current state of production of minerals key to the construction industry, the current production of construction recyclates, the possibilities of increasing recycling and increasing the applicability of the essence of the circular economy. The paper concludes with a summary of the results of the analysis and possible improvements.
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Study of the possibilities of using coarse aggregates from recycled concrete for the production of structural concrete
Voráč, Jiří ; Novosad, Petr (referee) ; Hela, Rudolf (advisor)
The master thesis is focused on the possibilities of using coarse recycled concrete aggregate as a substitution for coarse natural aggregate in structural concrete. Theoretical part of this thesis presents a literature review on the recycled concrete aggregate, mainly its production and use in structural concrete. Emphasis is placed on standards in Czech Republic, Europe and other countries of the world. Influence of recycled concrete aggregate on fresh and hardened concrete are also described. Experimental part is dedicated to determination of basic mechanical properties of recycled concrete aggregate and natural aggregate. Recycled concrete formulas and reference concrete formulas are also proposed. Proposed concrete mixes are subjected to tests for fresh and hardened concrete. The price of concrete mixes per 1 m3 is also described.
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Inclined belt conveyor of aggregates
Zavadil, Milan ; Malášek, Jiří (referee) ; Škopán, Miroslav (advisor)
The aim of this work is the design of helical conveyor belt for transport of building stone and recycled aggregate with a maximum grain size of 150 mm. Work includes a characteristic of some parts of the conveyor functional calculation, determine the key dimensions and design of power according to ISO 5048. Further strength calculation was carried out certain parts of the conveyor and assembly drawn in overall conveyor subassembly and stretching equipment.
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