Acta Polytechnica CTU Proceedings. 2019, vol. 21

 

Zobrazují se záznamy 1-10 z 10

    • ASSESSMENT OF ADHESION BETWEEN BITUMINOUS BINDER AND MINERAL AGGREGATE USING DIGITAL IMAGE ANALYSIS 

      Autor: Trejbal, Jan; Valentová, Tereza; Horová, Tereza
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Asphalt mixtures often fail due to a low adhesion of bituminous binder to mineral aggregate, which leads to surface coarse damages like potholes and fatigue cracking. To avoid this phenomenon, different types of adhesion ...

    • EFFECT OF BACTERIA BACILLUS PSEUDOFIRMUS AND FUNGUS TRICHODERMA REESEI ON SELF-HEALING ABILITY OF CONCRETE 

      Autor: Žáková, Hana; Pazderka, Jiří; Rácová, Zuzana; Ryparová, Pavla
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      There are usually used inorganic substances for the strengthening of self-healing ability of concrete but some specific types of bacteria or fungi may also be considered for use. The bacteria’s ability to fill pores and ...

    • RECONSTRUCTION OF THE MONASTERY NEXT TO THE PRAGUE CASTLE 

      Autor: Řehák, Jakub; Burgetová, Eva; Řehák, Josef; Řehák, Stanislav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The paper deals with a rehabilitation of the historic building of Carmel Monastery next to the Prague Castle. A structural survey of building was carried out and the historical drainage and ventilation system was identified. ...

    • PLASMA MODIFICATION OF POLYVINYL ALCOHOL MICROFIBERS TO IMPROVE COHESION WITH CEMENT MATRIX 

      Autor: Ďureje, Jakub; Prošek, Zdeněk; Trejbal, Jan; Tesárek, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The article describes plasma modifications of the surface of polyvinyl alcohol (PVA) microfibers using oxygen and hydrogen plasma in order to improve the properties of the composite material containing modified microfibers, ...

    • USE OF FINELY GROUND RECYCLED CONCRETE FOR IMPROVEMENT OF INTERFACIAL ADHESION IN FIBER-REINFORCED CEMENTITIOUS COMPOSITES 

      Autor: Hlůžek, Radim; Trejbal, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This paper deals with an improvement and an assessment of a polymeric macro-fibers adhesion to the cement matrix. For this purpose, two approaches were employed – (i) roughening of fibers using a plasma treatment and (ii) ...

    • MICROSCOPICAL AND MICROMECHANICAL FEATURES OF HIGH PERFORMANCE CONCRETE CONTAINING LOW LEVELS OF FLY ASH 

      Autor: Hrbek, Vladimír; Prošek, Zdeněk; Chylík, Roman; Vráblík, Lukáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Alkali activated fly ash is a widely used admixture to the concrete. Due to the pozzolanic activity, the fly ash can replace up to 60 mass percentage. The impact of fly ash on the concrete depend on the level of it content, ...

    • TECHNOLOGY OF PREPARATION OF BARIUM AND MAGNESIUM HYDROXIDE NANODISPERSION AND POSSIBILITIES OF THEIR USE IN MONUMENT CARE 

      Autor: Kroftová, Klára; Škoda, David; Kuřitka, Ivo; Kubát, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      An application of hydroxide nanoparticles in preservation of cultural heritage attracted great interest. The nanodispersions of calcium, magnesium or barium hydroxides exhibit high performance in consolidation abilities. ...

    • GLASS WASTE POWDER UTILIZATION IN HIGH PERFORMANCE CONCRETE 

      Autor: Mariaková, Diana; Vlach, Tomáš; Pavlů, Tereza
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This paper deals with investigation of high-performance concrete (HPC) with full replacement of the silica powder by the waste glass powder. The silica powder was replaced by two types of the waste glass powder, originated ...

    • RECYCLING AND ITS USE IN CONCRETE WASTE PROCESSING BY HIGH-SPEED MILLING 

      Autor: Prošek, Zdeněk; Tesárek, Pavel; Trejbal, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This article discusses the possibility of recycling of concrete waste using the high-speed milling method. The resulting of milling is micronize old concrete. Used old concrete was created by crushing of old concrete, which ...

    • RESISTANCE OF MORTARS WITH GYPSUM, LIME AND COMPOSITE BINDERS AGAINST MOLDS 

      Autor: Krejsová, Jitka; Doleželová, Magdaléna
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Resistance of three mortars (the lime mortar, the gypsum mortar and the mortar with the composite binder) against molds was evaluated. Mortars were also compared according to their pH, bulk density, strength and porosity. ...