|
|
Influence of input materials for quality architectural concrete
Ondryášová, Veronika ; Novosad, Petr (referee) ; Hela, Rudolf (advisor)
This diploma thesis focuses on the influence of properties of feedstocks for the production of quality surfaces of architectural concrete. The introductory part describes the definition of architectural concrete with the advantages and disadvantages of its implementation. In the following chapters, the characteristics, the dosage or the chemical composition of the input materials are given. Besides the design of the mixture, important parameters for the creation of a quality surface of concrete are compaction, precise placement in formwork and subsequent treatment of the surface. Individual types of architectural concrete, their method of production with the examples belonging to concrete constructions are also given. In the practical part, 4 mixtures were designed, whose type or dosage of feedstocks was changed. In creating mixtures, emphasis was placed on minimal segregation of fresh concrete and the formation of pores on the surface of hardened concrete.
|
|
|
Influence of environmental conditions on the modulus of elasticity of concrete
Peřina, Tomáš ; Novosad, Petr (referee) ; Křížová, Klára (advisor)
Increasingly, the modulus of elasticity of concrete is at the forefront of interest. In the past, it has been neglected to some reason and not taken into due consideration. The theoretical part of the bachelor thesis is to study of factors influencing the static modulus of elasticity in compression. The practical part is focused on monitoring the modulus of elasticity of concrete, based on the different type of the environment stored test specimens. Concrete will be stored outdoor in the water and in the laboratory environment conditions. Designed concrete mixes will be primarily different with the used of type of admixtures but also with type of cement. The result values will be compared on the dependence of environmental conditions of the test specimens.
|
|
|
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.
|
|
|
Processing of Web Advertisements in Ruby on Rails
Mrózek, Marian ; Novosad, Petr (referee) ; Letko, Zdeněk (advisor)
The goal of this thesis was to create an application that aggregates job ads from the ad servers on the Internet. In certain time intervals adverts are downloaded , then processed and stored in a database. Subsequently, these ads are ready to display through a web interface. The application is implemented using Ruby on Rails framework.
|
|
|
Chat and Shared Drawing Board for Pocket PCs with Bluetooth
Zapletal, Pavel ; Křivka, Zbyněk (referee) ; Novosad, Petr (advisor)
The aim of the project is to design and implement an application for a pocket PC that allows users to exchange short text messages and provides shared drawing board. On the beginning of this work, there is described bluetooth technology which is used for data-tranfer. In the next part are mentioned Pocket PC platform and possibilities of communication. The main part describes implementation in Microsoft's eMbedded Visual C++. At the end, there are listed possibilities of future development.
|
|
|
The use of dynamic non-destructive methods for determining the strength of cement from cement plant Hranice
Procházková, Lenka ; Novosad, Petr (referee) ; Brožovský, Jiří (advisor)
Nondestructive testing methods are employed as a tool for evaluation of parameters of building materials, especially to ascertain strength properties and to determine alteration occured during durability tests. An ultrasonic pulse velocity method is one of the most used nondestructive methods. A resonance method is employed among the nondestructive methods less. The aim of this work is to establish the calibration relationships between parameters of nondestructive testing and compressive strength value and flexural tensile strength value, respectively. Moreover, applicability of the calibration relationships is also discussed.
|
|
|
Module Package for Building Internet Applications in PHP
Rybák, Aleš ; Novosad, Petr (referee) ; Smrčka, Aleš (advisor)
Package of modules for development with PHP is project aimed on simplification and efficiency of programmer's work when developing web based applications in scripting language PHP. This project is continuation of PHP Modular Object framework and wants to extend its connectivity to new modules. Next goal is implementation of modules which allow programmers to use the development system.
|
|
|
Study of properties of cementitious composites with fiber reinforcement from inorganic fibers
Gottwaldová, Aneta ; Novosad, Petr (referee) ; Bodnárová, Lenka (advisor)
Diploma thesis deals with study of properties of cementious composites with fiber reinforcement from glass and basalt inorganic fibers. Diploma thesis includes a theoretical and experimental part. The theoretical part deals with information about glass and basalt fibers, their durability and usage. In the experimental part we monitored properfies of cement composites with basalt and glass fibers. Fibers were exposed to an aggressive environment. The properties of composites with reference fibers were compared with composites with fibers affacted by the aggressive environment. The properties of composites were examined after 28 and 90 days. We monitored compresive strenght, bending tensile strenght, tensile strenght, surface layer strenght and SEM.
|
|
|
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.
|
|
|
Monitoring the influence of concrete composition on abrasion resistance
Černá, Hana ; Novosad, Petr (referee) ; Bodnárová, Lenka (advisor)
This diploma thesis focuses on the resistance of concrete to abrasion with regard to the raw materials used for their production. In the theoretical part of the thesis are described admixtures, different types of aggregate and aggregate composition which influence the resistance of concrete to abrasion. In the experimental part, 15 different C30 / 37, S4 concrete formulations were proposed. Different types of aggregates - fecal gravel (Žabčice), biotic granodiorite (Olbramovice) and amphibolite (Želešice) have always been used in the recipes. Fine ground limestone, micro-silica, high-temperature fly ash and finely ground slag were ingredients that were added to the proposed recipes. Consistency was determined by the method of cone seating and the density of fresh concrete. In the hardened state, concrete density, compressive strength, bending tensile strength, tensile strength, watertightness, concrete absorption, and abrasion resistance were determined using the Böhm method and wide wheel method. The test specimens were tested after 7, 28, and 90 days of maturation.
|
guest ::
RSS feed.