Now showing items 21-40 of 110

  • Comparison of separate and co-grinding of the blended cements with the pozzolanic component 

    Dvořák, Karel; Dolák, Dušan; Dočkal, Jakub (Elsevier, 2016-08-03)
    The main difference between separate and co-grinding of blended cement is the fact that co-grinding occurs interaction among the milled components. These interactions may speed up milling process, or on the contrary to ...
  • Synthetic preparation of thaumasite – several possible routes for thaumasite formation 

    Rybová, Alexandra; Fridrichová, Marcela; Dvořák, Karel (Elsevier, 2016-08-04)
    Presented work is a part of an experiment where limestone is partially replaced by fluidized fly ash during cement manufacturing. Hydration of this type of cement is connected to formation of AFt phases – thaumasite and ...
  • Possibilities of using of alkali-activated mortars in aggressive environment 

    Válek, Jaroslav; Jarolím, Tomáš; Labaj, Martin (Elsevier, 2016-08-04)
    In the article the incipiental experimental works about using of alkali-activated mortars in aggressive environment are introduced. Several types of mortars with different composition were prepared and examined. Observed ...
  • Thermodynamic Stability of Ettringite Formed by Hydration of Ye’elimite Clinker 

    Fridrichová, Marcela; Dvořák, Karel; Gazdič, Dominik; Pekárková, Jana; Kulísek, Karel (Hindawi Publishing Corporation, 2016-09-08)
    Although the stability of ettringite has been the subject of much research, the solution is not yet fully clear. Ettringite is generally considered to be stable up to a temperature of 110°C; however, some investigators ...
  • The Use of Zeolite as Fluxing Agent for Whitewares 

    Sokolář, Radomír; Šveda, Mikuláš (Elsevier, 2016-11-15)
    The possibility of natural zeolite utilization as a fluxing agent for sintered ceramic bodies will be determined compared with traditional ceramic flux - feldspar and quartz sand as a grog without fluxing effect. Sintering ...
  • The FBC ash as a hydraulic ingredient of hydraulic lime 

    Dvořák, Karel; Kulísek, Karel; Gazdič, Dominik (Elsevier, 2017-01-31)
    This work is focused on the possibilities of utilization of ashes from fluidized bed combustion, i.e. FBC ashes, for the manufacturing of hydraulic lime. Alternative hydraulic binders are becoming very popular in the present ...
  • Behaviour of cement composites with lightweight and heavyweight aggregates at high temperatures 

    Bodnárová, Lenka; Peterková, Jitka; Brožovský, Jiří; Zach, Jiří; Válek, Jaroslav (Budapest University of Technology and Economics, 2017-03-24)
    This paper presents new results of the research of the influence of individual input components done on the behaviour of cement based composite materials exposed to high temperatures. A new approach of this research lies ...
  • The potential use of the FBC ash for the preparation of blended cements 

    Gazdič, Dominik; Fridrichová, Marcela; Kulísek, Karel; Vehovská, Ludmila (Elsevier, 2017-05-25)
    Ashes from fluidized bed combustion, i.e. FBC ashes, are not being practically used for the production of hydraulic binders. The problem is their chemical and mineralogical composition. FBC ashes are characterized by a ...
  • Composites Based on Alternative Raw Materials at High Temperature Conditions 

    Melichar, Tomáš; Bydžovský, Jiří; Dufka, Amos (Budapest University of Technology and Economics, 2017-10-24)
    This paper presents newly developed polymer-cement composites. The primary binder (cement) was partially substituted by use of blast-furnace slag and high-temperature fly ash. A lightweight aggregate – agloporite (grain ...
  • Alternative Evaluation of the grindability of Pozzolanic Materials for Cement Production 

    Dvořák, Karel; Dolák, Dušan (IOP Publishing, 2017-10-25)
    All conventional methods for the evaluation of grindability require a specific grinding instrument. These grinding instruments do not have any other practical use and thus are not very common. This paper focuses on the ...
  • The Effect of the Wear of Rotor Pins on Grinding Efficiency in a High-speed Disintegrator 

    Dvořák, Karel; Dolák, Dušan; Paloušek, David; Čelko, Ladislav; Jech, David (Kaunas University of Technology, 2018-02-19)
    One of the directions intensively investigated in the field of milling is high-energy milling (HEM). One type of HEM is high-speed grinding in high-speed disintegrators. This type of mill is particularly suitable for the ...
  • Optimization of heavy weight concrete composition and process of prefabrication for prefabricated shielding cladding tiles 

    Hela, Rudolf; Jančaříková, Denisa; Louda, Pavel; Jobánek, Jaromír (IOP Publishing, 2018-06-15)
    The aim of experimental research was to verify the possibility of the prefabrication of the thin shielding cladding tiles from heavy weight concrete with fine.
  • Variability in cement properties - influence on bleeding of cement paste 

    Jančaříková, Denisa; Hela, Rudolf; Netsvet, Daria Dmitrievna; Peřina, Tomáš (IOP Publishing, 2018-06-15)
    The aim of this study is to find relation between cement properties and tendency of cement paste (concrete) to bleeding. We tested 19 cement samples collected from different batches.
  • Development of Ultra High Performance Concrete and Reactive Powder Concrete with Nanosilica 

    Hela, Rudolf; Bodnárová, Lenka; Rundt, Lukáš (IOP Publishing, 2018-06-19)
    The article is dedicated to the design and production of Ultra High Performance Concrete (UHPC) and Reactive The article is dedicated to the design and production of Ultra High Performance Concrete (UHPC) and Reactive ...
  • Raw materials for mullite grog manufacturing 

    Nevřivová, Lenka (IOP Publishing, 2018-07-07)
    The primary condition for manufacturing is the correct choice of raw material, a suitable treatment facility, and a kiln capable of firing at temperatures above 1400 °C. This paper assesses some local raw materials for ...
  • Utilization of by-products for vacuum insulation panels production 

    Zach, Jiří; Peterková, Jitka; Novák, Vítězslav (IOP Publishing, 2018-07-12)
    The paper deals with the possibilities of utilization of alternative raw materials from the textile industry for the production of vacuum insulation panels with extremely low thermal conductivity value. The paper presents ...
  • Repairing composite using hazardous waste containing heavy metals 

    Žlebek, Tomáš; Hodul, Jakub; Drochytka, Rostislav (IOP Publishing, 2018-07-16)
    This research deals with the possibility of using hazardous waste in epoxy resinbased polymeric substances. More specifically, it is the use of neutralising galvanic sludge (NGS), which produces as a by-product in the ...
  • Study of hydration process of ternesite clinker 

    Fridrichová, Marcela; Gazdič, Dominik; Dvořák, Karel; Pekárková, Jana; Kulísek, Karel (IOP Publishing, 2018-07-16)
    Currently ternesite, Ca5(SiO4)2SO4, is used in the cement production, is one of two key phases of calcium sulfoaluminate cement. Some investigators claim that this phase is nearly inert or very low reactive and it hydrates ...
  • Monitoring the long-term durability and microstructure of polymer concrete patching materials with high content of secondary raw materials using advanced methods 

    Hodul, Jakub; Mészárosová, Lenka; Drochytka, Rostislav (IOP Publishing, 2018-07-16)
    For commercially produced polymer systems, only primary raw materials are used as fillers. These fillers are predominantly pure silica sand of various grading. The substitution of primary materials with secondary raw ...
  • The fly ash of class C for ceramic technology 

    Sokolář, Radomír; Nguyen, Martin (IOP Publishing, 2018-07-16)
    The properties of different Czech fluidized fly ashes FFA (class C fly ash according to ASTM C618 12a with high content of CaO in the form of anhydrite primarily) and emisions of SO2 in flue gas during the firing of FFA ...