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Pavel Reiterman
Faculty of Civil Engineering, Czech Technical University in Prague, Thakurova 7, 166 29 Prague, Czech Republic

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Journal article
Published: 17 August 2021 in Materials
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The paper focuses on investigating the effect of impregnation of recycled concrete aggregate on the mechanical and durability properties of concrete using this aggregate. Cement paste, limewater and diluted water glass were used to impregnate the aggregate. Both a single impregnation and a double impregnation using two different solutions were carried out. A total of four groups of concrete series, with two values of w/c ratio (0.45 and 0.60), were made. Concrete made using the impregnated aggregate was tested and the results were compared with those of concrete made using untreated recycled aggregate of the same kind. The results indicate that impregnation of aggregate improves the mechanical properties of concrete in many cases but reduces its resistance to cyclic freezing and thawing. Furthermore, in the case of impregnation with two solutions, the order in which the impregnants are applied influences the effect obtained. Using the results received, the impregnation methods were ranked in order from best to worst. The best impregnation method proved to be with cement paste, followed by diluted water glass, while the worst results were obtained with limewater, followed by diluted water glass.

ACS Style

Roman Jaskulski; Pavel Reiterman; Wojciech Kubissa; Yaroslav Yakymechko. Influence of Impregnation of Recycled Concrete Aggregate on the Selected Properties of Concrete. Materials 2021, 14, 4611 .

AMA Style

Roman Jaskulski, Pavel Reiterman, Wojciech Kubissa, Yaroslav Yakymechko. Influence of Impregnation of Recycled Concrete Aggregate on the Selected Properties of Concrete. Materials. 2021; 14 (16):4611.

Chicago/Turabian Style

Roman Jaskulski; Pavel Reiterman; Wojciech Kubissa; Yaroslav Yakymechko. 2021. "Influence of Impregnation of Recycled Concrete Aggregate on the Selected Properties of Concrete." Materials 14, no. 16: 4611.

Conference paper
Published: 19 May 2021 in High Performance Fiber Reinforced Cement Composites 6
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Concrete crack mitigation in hydro-engineering projects belongs to important tasks during design and operational stages. The paper focuses on a design of reinforced upstream concrete face of a polder. The face is made of cast concrete blocks, 15 m long, 2.5 m tall and up to 2.5 m thick. First, the paper summarizes design of two concretes with low hydration heat and their strength evolution, basic creep, calorimetry data, and freeze-thaw resistance. Heat release was further validated on a small insulated concrete cube. Second, a thermo-mechanical model has been assembled, taking into account heat of hydration, ageing basic creep, autogenous shrinkage, evolution of tensile strength. A multi-directional fixed crack model captures crack initiation, crack opening is controlled by exponential softening and dissipation of correct amount of energy is guaranteed by crack-band approach. Summer casting scenario is presented, showing crack evolution due to different reinforcement ratios and concrete mix design. The results show that minimizing cement amount in concrete is a must and crack width can remain under required 0.20 mm with the reinforcement ratio of 0.4–0.6%, depending on mix design.

ACS Style

Vít Šmilauer; Petr Havlásek; Pavel Reiterman; Petr Huňka. Crack Control of Upstream Polder Face Using Calibrated Thermo-mechanical Simulations. High Performance Fiber Reinforced Cement Composites 6 2021, 189 -200.

AMA Style

Vít Šmilauer, Petr Havlásek, Pavel Reiterman, Petr Huňka. Crack Control of Upstream Polder Face Using Calibrated Thermo-mechanical Simulations. High Performance Fiber Reinforced Cement Composites 6. 2021; ():189-200.

Chicago/Turabian Style

Vít Šmilauer; Petr Havlásek; Pavel Reiterman; Petr Huňka. 2021. "Crack Control of Upstream Polder Face Using Calibrated Thermo-mechanical Simulations." High Performance Fiber Reinforced Cement Composites 6 , no. : 189-200.

Journal article
Published: 30 April 2021 in Buildings
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This research is focused on the utilization of cable waste originating during the recycling of wires as a partial substitution of natural aggregate in cement screed. The main goal of the work performed was to find an optimal level of substitution in terms of freezing–thawing resistance, which is a significant aspect for such type of concrete mixtures. The studied artificial aggregate was gradually dosed in cement screed by 5% in a volume of up to 30% of substitution. The influence of the substitution was also evaluated in terms of compressive strength, flexural strength, bulk density determination, and the ultrasonic pulse method. Gradual substitution led to the reduction of the bulk density and studied mechanical properties due to the considerable air-entraining effect. The utilization of cable waste reduced the value of modulus of elasticity and modified deformation behavior of studied mixtures, which exhibited significant softening during the flexural test. Studied screed mixtures incorporating waste material exhibited slightly lower values of the coefficient of freeze-thaw resistance in comparison with the control mixture, however, the attained values comply with technical requirements.

ACS Style

Pavel Reiterman; Martin Lidmila. The Use of Crushed Cable Waste as a Substitute of Natural Aggregate in Cement Screed. Buildings 2021, 11, 190 .

AMA Style

Pavel Reiterman, Martin Lidmila. The Use of Crushed Cable Waste as a Substitute of Natural Aggregate in Cement Screed. Buildings. 2021; 11 (5):190.

Chicago/Turabian Style

Pavel Reiterman; Martin Lidmila. 2021. "The Use of Crushed Cable Waste as a Substitute of Natural Aggregate in Cement Screed." Buildings 11, no. 5: 190.

Journal article
Published: 17 March 2021 in Minerals
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Waste building sludge (WBS) originating in the production of concrete prestressed poles (CSW) and technical stone (TSW) used in original and Fe-modified forms (CSWFe, TSWFe) was tested as an environmentally friendly and cheap sorbent of selected cations (Cd2+, Pb2+, Cs+) and anions (AsO4 3−, PO4 3−, CrO4 2−) from water. The experiments were performed with 0.1 and 0.5 mmol·L−1 model solutions in a batch manner at laboratory temperature. Adsorption data were fitted with the Langmuir model. The adsorption of cations (Pb2+ and Cd2+) ran almost quantitatively (>97%) on both CSW and TSW. Cesium (Cs+) adsorption on TSW reached 80%, while in the case of CSW, it was ineffective. The modification of CSW and TSW with FeII (CSWFe and TSWFe) improved their adsorption selectivity to anions by up to 70%. The adsorption of PO4 3− and AsO4 3− ran quantitatively (>98%) on modified CSWFe and TSWFe and also on initial CSW, while CrO4 2− was effectively adsorbed (≈80%) on TSWFe only. The adsorption affinity of tested ions in terms of adsorption capacity and sorbent consumption declined in order as follows: Pb2+ ≈ Cd2+ >> Cs+ for cations and AsO4 3− ≈ PO4 3− > CrO4 2− for anions.

ACS Style

Barbora Doušová; Eva Bedrnová; Pavel Reiterman; Martin Keppert; David Koloušek; Miloslav Lhotka; Libor Mastný. Adsorption Properties of Waste Building Sludge for Environmental Protection. Minerals 2021, 11, 309 .

AMA Style

Barbora Doušová, Eva Bedrnová, Pavel Reiterman, Martin Keppert, David Koloušek, Miloslav Lhotka, Libor Mastný. Adsorption Properties of Waste Building Sludge for Environmental Protection. Minerals. 2021; 11 (3):309.

Chicago/Turabian Style

Barbora Doušová; Eva Bedrnová; Pavel Reiterman; Martin Keppert; David Koloušek; Miloslav Lhotka; Libor Mastný. 2021. "Adsorption Properties of Waste Building Sludge for Environmental Protection." Minerals 11, no. 3: 309.

Journal article
Published: 18 December 2020 in Materials
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The main aim of this study was to investigate the improved autogenous healing of concrete caused by a crystalline admixture in combination with textile reinforced concrete (TRC). This phenomenon (improved healing) has not yet been described by any independent study, and not at all in relation to TRC. The results of the study confirmed that the interaction between TRC and the crystalline admixture’s self-healing ability is advantageous and usable. The application of crystalline admixture could ensure the long-term entirety of the TCR element, where microcracks could occur. This allows for the creation of advantageous, thin (achieved by TRC) and waterproof (achieved by the crystalline admixtures) concrete structures. Moreover, this does not depend on temperature in the range of 4–30 °C (lower temperatures are of course problematic, as for most other cementitious materials). However, the interaction of both materials has its limits; the cracks must not be too wide (max. 0.1 mm), otherwise they will not heal. On the other hand, the advantage is that it does not matter what type of cement is used (CEM I and CEM II showed the same results), and the composition of the newly formed crystals in the cracks corresponds to the composition of the C-S-H gel, so it can be assumed that secondary hydration of the Portland cement occurred in the crack area.

ACS Style

Hana Žáková; Jiří Pazderka; Pavel Reiterman. Textile Reinforced Concrete in Combination with Improved Self-Healing Ability Caused by Crystalline Admixture. Materials 2020, 13, 5787 .

AMA Style

Hana Žáková, Jiří Pazderka, Pavel Reiterman. Textile Reinforced Concrete in Combination with Improved Self-Healing Ability Caused by Crystalline Admixture. Materials. 2020; 13 (24):5787.

Chicago/Turabian Style

Hana Žáková; Jiří Pazderka; Pavel Reiterman. 2020. "Textile Reinforced Concrete in Combination with Improved Self-Healing Ability Caused by Crystalline Admixture." Materials 13, no. 24: 5787.

Journal article
Published: 28 October 2020 in Materials
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In this paper, light burned magnesia dispersed in the magnesium chloride solution was used for the manufacturing of magnesium oxychloride cement-based composites which were lightened by granulated scrap tires and expanded glass. In a reference composite, silica sand was used only as filler. In the lightened materials, granulated shredded tires were used as 100%, 90%, 80%, and 70% silica sand volumetric replacement. The rest was compensated by the addition of expanded glass granules. The filling materials were characterized by particle size distribution, specific density, dry powder density, and thermal properties that were analyzed for both loose and compacted aggregates. For the hardened air-cured samples, macrostructural parameters, mechanical properties, and hygric and thermal parameters were investigated. Specific attention was paid to the penetration of water and water-damage, which were considered as crucial durability parameters. Therefore, the compressive strength of samples retained after immersion for 24 h in water was tested and the water resistance coefficient was assessed. The use of processed waste rubber and expanded glass granulate enabled the development of lightweight materials with sufficient mechanical strength and stiffness, low permeability for water, enhanced thermal insulation properties, and durability in contact with water. These properties make the produced composites an interesting alternative to Portland cement-based materials. Moreover, the use of low-carbon binder and waste tires can be considered as an eco-efficient added value of these products which could improve the environmental impact of the construction industry.

ACS Style

Milena Pavlíková; Adam Pivák; Martina Záleská; Ondřej Jankovský; Pavel Reiterman; Zbyšek Pavlík. Magnesium Oxychloride Cement Composites Lightened with Granulated Scrap Tires and Expanded Glass. Materials 2020, 13, 4828 .

AMA Style

Milena Pavlíková, Adam Pivák, Martina Záleská, Ondřej Jankovský, Pavel Reiterman, Zbyšek Pavlík. Magnesium Oxychloride Cement Composites Lightened with Granulated Scrap Tires and Expanded Glass. Materials. 2020; 13 (21):4828.

Chicago/Turabian Style

Milena Pavlíková; Adam Pivák; Martina Záleská; Ondřej Jankovský; Pavel Reiterman; Zbyšek Pavlík. 2020. "Magnesium Oxychloride Cement Composites Lightened with Granulated Scrap Tires and Expanded Glass." Materials 13, no. 21: 4828.

Journal article
Published: 26 June 2020 in Materials
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Selfcompaction concrete (SCC) is ranked among the main technological innovations of the last decades. Hence, it introduces a suitable possibility for further utilization of supplementary cementitious materials (SCM) in terms of sustainable development. The aim of the work is the assessment of a new approach to binder design, which takes into consideration the activity of the used mineral additive. The proposed approach, which allows a systematic design of a binding system with varied properties of the used mineral additive, was studied on ternary blends consisting of Portland cement (PC), limestone powder and fly ash (FA). The verification was conducted on SCC mixtures in terms of their workability, mechanical properties and the most attention was paid to longterm durability. The longterm durability was assessed on the basis of shrinkage measurement, freezethaw resistance and permeability tests including initial surface absorption, chloride migration, water penetration and an accelerated carbonation test, which was compared with the evolution of carbonation front in normal conditions. The durability of studied mixtures was evaluated by using durability loss index, which allow general assessment on the basis of multiple parameters. The carbonation resistance had a dominant importance on the final durability performance of studied mixtures. The experimental program revealed that the proposed design method is reliable only in terms of properties in fresh state and mechanical performance, which were similar with control mixture. Despite suitable results of freezethaw resistance and shrinkage, an increasing amount of fly ash in terms of the new design concept led to a fundamental increase of permeability and thus to decay of longterm durability. Acceptable properties were achieved for the lowest dosage of fly ash.

ACS Style

Pavel Reiterman; Roman Jaskulski; Wojciech Kubissa; Ondřej Holčapek; Martin Keppert. Assessment of Rational Design of Self-Compacting Concrete Incorporating Fly Ash and Limestone Powder in Terms of LongTerm Durability. Materials 2020, 13, 2863 .

AMA Style

Pavel Reiterman, Roman Jaskulski, Wojciech Kubissa, Ondřej Holčapek, Martin Keppert. Assessment of Rational Design of Self-Compacting Concrete Incorporating Fly Ash and Limestone Powder in Terms of LongTerm Durability. Materials. 2020; 13 (12):2863.

Chicago/Turabian Style

Pavel Reiterman; Roman Jaskulski; Wojciech Kubissa; Ondřej Holčapek; Martin Keppert. 2020. "Assessment of Rational Design of Self-Compacting Concrete Incorporating Fly Ash and Limestone Powder in Terms of LongTerm Durability." Materials 13, no. 12: 2863.

Journal article
Published: 30 April 2020 in Acta Polytechnica
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The volume changes of cement based composites are significantly exhibited in the hardening process. Initial phases of the hardening are complemented by the expansion due to the heat evolution that is subsequently alternated by the shrinkage. Both could cause a crack initiation. It is evident that ultimate volume changes of cement based composites are a complex process, because the final shrinkage is determined by the binder used, exposition and also by the previous history. The paper focuses on the evaluation of the main types of cements based on the Portland clinker by using a conventional procedure for the determination of the shrinkage on the standard cements mortars. These mortars were exposed to drying after 1 and 3 days of curing, related to the actual degree of hydration, which was estimated on the basis of compressive strength development. The hydration process was additionally monitored using thermogravimetry on the accompanying paste specimens during one year. The performed experimental program confirmed the essential sense of the curing regime especially for blended cement systems, which exhibited very low values of the hydration degree at applied curing intervals. Despite the slightly higher values of shrinkage of blended cements, the obtained results signalize the crucial effect of prolonged curing for these types of binders. The conclusion highlighted the necessity of taking into consideration the hydration degree during cement testing by using the conventional contact method. Otherwise, the simple interpretation leads to an overestimation of the less-suitable material solution.

ACS Style

Vendula Davidová; Pavel Reiterman. SHRINKAGE OF VARIOUS TYPES OF PORTLAND CLINKER-BASED CEMENTS WITH RESPECT TO THEIR HYDRATION DEGREE. Acta Polytechnica 2020, 60, 88 -97.

AMA Style

Vendula Davidová, Pavel Reiterman. SHRINKAGE OF VARIOUS TYPES OF PORTLAND CLINKER-BASED CEMENTS WITH RESPECT TO THEIR HYDRATION DEGREE. Acta Polytechnica. 2020; 60 (2):88-97.

Chicago/Turabian Style

Vendula Davidová; Pavel Reiterman. 2020. "SHRINKAGE OF VARIOUS TYPES OF PORTLAND CLINKER-BASED CEMENTS WITH RESPECT TO THEIR HYDRATION DEGREE." Acta Polytechnica 60, no. 2: 88-97.

Articles
Published: 12 February 2020 in International Journal of Pavement Engineering
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The present paper deals with the long-term experimental study focusing on the properties of concrete mixtures with the addition of ceramic powder, which originate during the hollow brick production. The used ceramic powder was applied as Portland cement replacement up to 30 wt.%. The properties of concrete were evaluated in terms of fresh mixture parameters, mechanical, permeability and durability properties based on the accelerated testing. The progress of the pozzolanic reaction was monitored using thermal analysis. Higher dosage of ceramic powder caused a significant loss of workability and an increase of permeability, which were declared on the results of carbonation test and freeze–thaw cycling. However, a mixture with 25 wt.% replacement exhibited values similar to the control mixture after 3 years. The production of vibro-pressed concrete pavement element was selected for industrial testing due to the reduced workability. However, only 15 wt.% replacement was applied for the operational tests, which were evaluated in terms of split strength after 5 days and freeze–thaw cycling after 28 days. Industrially produced specimens exhibited similar or higher values of studied parameters in comparison to the control mixture. Long-term mechanical tests and freeze–thaw cycling confirmed great practical potential of ceramic powder for these type of elements.

ACS Style

Pavel Reiterman; Ondřej Holčapek; Roman Jaskulski; Wojciech Kubissa. Long-term behaviour of ceramic powder containing concrete for pavement blocks. International Journal of Pavement Engineering 2020, 1 -8.

AMA Style

Pavel Reiterman, Ondřej Holčapek, Roman Jaskulski, Wojciech Kubissa. Long-term behaviour of ceramic powder containing concrete for pavement blocks. International Journal of Pavement Engineering. 2020; ():1-8.

Chicago/Turabian Style

Pavel Reiterman; Ondřej Holčapek; Roman Jaskulski; Wojciech Kubissa. 2020. "Long-term behaviour of ceramic powder containing concrete for pavement blocks." International Journal of Pavement Engineering , no. : 1-8.

Journal article
Published: 31 August 2019 in Acta Polytechnica
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Concrete is a relatively new structural material, hence the remediation of concrete structures is very rare. There are a lot of concrete fortifications in the Czech Republic, which were built just before WW2. These bunkers formed a long defensive line along the Czechoslovak borders as a protection against Hitler’s army. Today, after 80 years, many of the bunkers are listed as Czech national technical monuments with a strict protection of their historical authenticity. The article describes the technical survey and the possible conservation method of a selected concrete fortification, which exhibits a number of moisture related problems. The studied two-storey, heavily fortified bunker is situated close to the northern border of the Czech Republic, former Czechoslovakia. A detailed survey of the building includes the analysis of the interior environment parameters and laboratory testing of the used concrete. A long-term diagnosis identified the main problem, which lies in the inhomogeneity of the used concrete and the relating massive water ingress. However, the monitored bunker currently does not serve as a military structure and, therefore, a simple solution to improve the internal environment was suggested on the basis of the conducted measurements. With respect to the main causes of failures, the authors suggested a conservation method based on using a crystallizing coating. The suitability of the method was first verified under laboratory conditions and then also on the real bunker.

ACS Style

Jiří Pazderka; Pavel Reiterman. CZECH WW2 CONCRETE FORTIFICATIONS: CORROSION PROCESSES AND REMEDIATION METHOD BASED ON CRYSTALLIZING COATING. Acta Polytechnica 2019, 59, 359 -371.

AMA Style

Jiří Pazderka, Pavel Reiterman. CZECH WW2 CONCRETE FORTIFICATIONS: CORROSION PROCESSES AND REMEDIATION METHOD BASED ON CRYSTALLIZING COATING. Acta Polytechnica. 2019; 59 (4):359-371.

Chicago/Turabian Style

Jiří Pazderka; Pavel Reiterman. 2019. "CZECH WW2 CONCRETE FORTIFICATIONS: CORROSION PROCESSES AND REMEDIATION METHOD BASED ON CRYSTALLIZING COATING." Acta Polytechnica 59, no. 4: 359-371.

Journal article
Published: 29 July 2019 in Materials
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The growing utilization of various mineral additives in the building industry has caused concern worldwide to reduce the emissions of carbon dioxide from Portland cement (OPC) production. The present paper is focused on the determination of the degree of hydration of blended binding systems based on Portland cement. Blast furnace slag, fly ash, and ceramic powder are used in the study; they are applied by 12.5 wt.% up to 50% of OPC replacement. The evolution of the hydration process is monitored using thermogravimetry in selected time intervals to determine the degree of hydration; its ultimate value is obtained from numerical estimation using the Michaelis-Menten equation. However, due to the application of active mineral additives, the correction in terms of equivalent binder is conducted. Corrected values of the degree of hydration exhibit good fit with compressive strength.

ACS Style

Pavel Reiterman; Ondřej Holčapek; Vendula Davidová; Roman Jaskulski; Martin Keppert. Estimation of Hydration Degree of Blended Cements with the Help of k-Values. Materials 2019, 12, 2420 .

AMA Style

Pavel Reiterman, Ondřej Holčapek, Vendula Davidová, Roman Jaskulski, Martin Keppert. Estimation of Hydration Degree of Blended Cements with the Help of k-Values. Materials. 2019; 12 (15):2420.

Chicago/Turabian Style

Pavel Reiterman; Ondřej Holčapek; Vendula Davidová; Roman Jaskulski; Martin Keppert. 2019. "Estimation of Hydration Degree of Blended Cements with the Help of k-Values." Materials 12, no. 15: 2420.

Conference paper
Published: 25 July 2019 in Acta Polytechnica CTU Proceedings
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Autogenous shrinkage of cement based composites is important property influencing number of their engineering application. Its ultimate value is predominantly determined by mineralogical composition of cement and its particle size distribution. Present paper introduces experimental study focused on the evaluation of various cements of grade CEM I 42.5 produced in Czech Republic in terms of shrinkage under autogenous conditions. Selected cement type is currently the most frequently used cement. Conducted study confirmed essential differences in ultimate values of shrinkage, which is partially determined by its specific surface area. Accompanying tests of mechanical properties indicate the influence of particle size distribution, which controls initial phases of cement hydration.

ACS Style

Vendula Davidová; Pavel Reiterman. AUTOGENOUS SHRINKAGE OF COMPOSITES BASED ON PORTLAND CEMENT. Acta Polytechnica CTU Proceedings 2019, 22, 22 -25.

AMA Style

Vendula Davidová, Pavel Reiterman. AUTOGENOUS SHRINKAGE OF COMPOSITES BASED ON PORTLAND CEMENT. Acta Polytechnica CTU Proceedings. 2019; 22 ():22-25.

Chicago/Turabian Style

Vendula Davidová; Pavel Reiterman. 2019. "AUTOGENOUS SHRINKAGE OF COMPOSITES BASED ON PORTLAND CEMENT." Acta Polytechnica CTU Proceedings 22, no. : 22-25.

Journal article
Published: 01 April 2019 in REVIEWS ON ADVANCED MATERIALS SCIENCE
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This paper describes a study of the effect of partial replacement of ordinary Portland cement (OPC) by various mineral additives in the screed mixtures. Ceramic powder, blast furnace slag and fly ash were gradually employed in increments of 12.5 wt.% up to 50 wt.% to replace OPC. The mixtures were designed to a constant consistency. The influence of mineral additives was evaluated in terms of the air content in the fresh mixtures, the compressive strength, the flexural strength and the freeze-thaw resistance and using non-destructive measurements after 28 and 90 days. The accompanied paste sampleswere analysed using thermogravimetry to monitor the hydration process by means of total bound water content. The decrease in the mechanical properties and the frost resistance of the mixtures with the mineral additives were recorded, because of the necessity for a larger addition of water. According to the valid standards for concrete screed related to the frost resistance, it could be concluded that maximal suitable cement replacement contents are 12.5, 37.5 and 50 wt.% for ceramic powder, fly ash and blast furnace slag, respectively. The freeze-thaw resistance of the studied materials was found to be strongly related to the content of CSH and CAH hydrates.

ACS Style

Pavel Reiterman; Ondřej Holčapek; Ondřej Zobal; Martin Keppert. Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials. REVIEWS ON ADVANCED MATERIALS SCIENCE 2019, 58, 66 -74.

AMA Style

Pavel Reiterman, Ondřej Holčapek, Ondřej Zobal, Martin Keppert. Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials. REVIEWS ON ADVANCED MATERIALS SCIENCE. 2019; 58 (1):66-74.

Chicago/Turabian Style

Pavel Reiterman; Ondřej Holčapek; Ondřej Zobal; Martin Keppert. 2019. "Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials." REVIEWS ON ADVANCED MATERIALS SCIENCE 58, no. 1: 66-74.

Journal article
Published: 08 January 2019 in Materials Structures Technology
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ACS Style

Ondřej Holčapek; Jan Machovec; Pavel Reiterman. Strengthening of Masonry Pillars by Textile Reinforced Concrete Wrapping of Different Thickness. Materials Structures Technology 2019, 1, 1 .

AMA Style

Ondřej Holčapek, Jan Machovec, Pavel Reiterman. Strengthening of Masonry Pillars by Textile Reinforced Concrete Wrapping of Different Thickness. Materials Structures Technology. 2019; 1 (2):1.

Chicago/Turabian Style

Ondřej Holčapek; Jan Machovec; Pavel Reiterman. 2019. "Strengthening of Masonry Pillars by Textile Reinforced Concrete Wrapping of Different Thickness." Materials Structures Technology 1, no. 2: 1.

Articles
Published: 27 September 2018 in European Journal of Environmental and Civil Engineering
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This article is focused on the durability of white cement-based concrete treated with a nanoparticle coating developed for the production of facade panels. The mixtures under study were modified by the addition of metakaolin, which was applied as a cement replacement up to 22.5%. Metakaolin was used to increase primary resistance of the concrete to impacts from the environment. Final properties were investigated by means of compressive strength, chloride migration test, initial surface absorption test, and frost resistance. The efficiency of the surface treatment was evaluated in terms of transport properties and changes after the temperature cycling. The performed experimental program confirmed a positive influence of metakaolin addition in terms of all studied parameters; however, 15% replacement can be assumed as an optimum. The nanoparticle treatment contributed significantly to the mitigation of transport properties of the concrete mixtures. Nevertheless, cyclic temperature loading slightly reduced its tightness; local water and also chloride ions ingress was recorded. The experiments confirmed the strong potential for additional surface treatment based on the nanotechnology, but also accented the necessity of including tasks of long-term durability and primary resistance of concrete to the entire design of the structural elements.

ACS Style

Pavel Reiterman. Influence of metakaolin additive and nanoparticle surface treatment on the durability of white cement based concrete. European Journal of Environmental and Civil Engineering 2018, 24, 2270 -2283.

AMA Style

Pavel Reiterman. Influence of metakaolin additive and nanoparticle surface treatment on the durability of white cement based concrete. European Journal of Environmental and Civil Engineering. 2018; 24 (13):2270-2283.

Chicago/Turabian Style

Pavel Reiterman. 2018. "Influence of metakaolin additive and nanoparticle surface treatment on the durability of white cement based concrete." European Journal of Environmental and Civil Engineering 24, no. 13: 2270-2283.

Journal article
Published: 30 August 2018 in Acta Polytechnica
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This article deals with the long-term durability of a relatively new composite – textile reinforced concrete (TRC). The studied composite material introduces a modern and favourite solution in contemporary architecture and structural engineering. It could also be used in renovation and monument restoration due to its high utility properties. The experimental program was focused on the determination of the resistance of the TRC in an aggressive environment using durability accelerated tests. The high performance concrete (HPC), which we used in our study, exhibited a compressive strength exceeding 100MPa after 28 days. Specimens were subjected to a 10% solution of H2SO4, 10% solution of NaOH, and freeze-thaw cycling respectively. All these environments can occur in real conditions in the TRC practical utilization. The testing was carried out on “dog-bone” shaped specimens, specially designed for the tensile strength measurement. Studied TRC specimens were reinforced by textiles of three different square weight that were applied in one or two layers, which led to the expected increase of tensile strength The freeze-thaw cycling had the biggest influence on the tensile properties, because it causes micro-cracks formation. The specimens exposed to the chemically aggressive environment deteriorated mostly on the surface, because of the high density of the concrete and generally low penetration of the media used. The resistance of the studied TRC to the aggressive environment increased with the applied reinforcement rate. The performed experimental programme highlighted the necessity of including the durability properties in the design of structural elements.

ACS Style

Jan Machovec; Pavel Reiterman. INFLUENCE OF AGGRESSIVE ENVIRONMENT ON THE TENSILE PROPERTIES OF TEXTILE REINFORCED CONCRETE. Acta Polytechnica 2018, 58, 245 -252.

AMA Style

Jan Machovec, Pavel Reiterman. INFLUENCE OF AGGRESSIVE ENVIRONMENT ON THE TENSILE PROPERTIES OF TEXTILE REINFORCED CONCRETE. Acta Polytechnica. 2018; 58 (4):245-252.

Chicago/Turabian Style

Jan Machovec; Pavel Reiterman. 2018. "INFLUENCE OF AGGRESSIVE ENVIRONMENT ON THE TENSILE PROPERTIES OF TEXTILE REINFORCED CONCRETE." Acta Polytechnica 58, no. 4: 245-252.

Journal article
Published: 24 July 2018 in Journal of Cleaner Production
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Sorption is technologically simple and cost-effective method for removal of heavy metals from waste waters. Wide range of sorbent can be used; aluminosilicates materials (clay minerals, zeolites) are well known for their ability to sorb ionic species from water solutions. Ceramic materials belong to aluminosilicates as well; the present paper deals with utilization of ceramic powder, generated as waste product in production of hollow bricks, as sorbent for heavy metals. Pozzolanic activity – i.e. ability to replace part of cement in concrete – is another attribute of powdered ceramic materials. The red-clay based ceramic powder was primarily used as sorbent for Cu, Pb and Zn. The sorption experiments revealed that application potential of ceramic sorbent is comparable with other aluminosilicate, low-cost sorbents. The sorption capacity decreased in sequence Cu > Pb > Zn (sorption capacity 91, 186 and 43 mg g-1). Secondly the sorbent with adsorbed metal species was used as cement replacing addition in concrete. This approach has two relevancies; 1) the substitution of cement by ceramic saves natural resources and concrete carbon footprint and 2) the cementitious matrix provides solidification/stabilization of adsorbed species. The unused ceramic powder was found to be very efficient cement substitute (28-days compressive strength 70 MPa was reached); unfortunately the adsorbed metals species influenced negatively the rate of setting and strengthening of concrete. The significant retardation effect was observed in case of Cu, while the influence of Pb and Zn was highly dependent on the sorbent dosage. The studied ceramic powder has not any commercial application yet, but the achieved experimental results indicate its perspective application as low-cost sorbent of ionic species.

ACS Style

Martin Keppert; Barbora Doušová; Pavel Reiterman; David Koloušek; Martina Záleská; Robert Černý. Application of heavy metals sorbent as reactive component in cementitious composites. Journal of Cleaner Production 2018, 199, 565 -573.

AMA Style

Martin Keppert, Barbora Doušová, Pavel Reiterman, David Koloušek, Martina Záleská, Robert Černý. Application of heavy metals sorbent as reactive component in cementitious composites. Journal of Cleaner Production. 2018; 199 ():565-573.

Chicago/Turabian Style

Martin Keppert; Barbora Doušová; Pavel Reiterman; David Koloušek; Martina Záleská; Robert Černý. 2018. "Application of heavy metals sorbent as reactive component in cementitious composites." Journal of Cleaner Production 199, no. : 565-573.

Conference paper
Published: 18 July 2018 in THERMOPHYSICS 2018: 23rd International Meeting of Thermophysics 2018
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This contribution is focused on investigation of refractory cement composite’s properties after the action of different temperature loading. Examinee composite consists of aluminous cement, metakaolin and basalt aggregates. Combination of two lengths of basalt fibres was used as reinforcement. The experimental investigation deals with study of bulk density, compressive and flexural strength and fracture energy. All these parameters were analyzed on specimens with dimensions 40×40×160 mm after the action of various temperatures. The thermal loading was applied in range of 100°C to 1000°C with gradient per 100°C (100°C, 200°C, 300°C, …, 800°C, 900°C, 1000°C) and took 180 minutes. Residual values of mechanical properties after thermal load on 1000°C achieved between 30% and 40% of reference level. The main part of mechanical propertie’s decrease was described up to 400°C. The positive effect of basalt fibres was recorded especially on values of flexural strength and fracture energy. Residual properties after the maximal thermal loading on 1000°C level achieved still sufficient level for practical applications.

ACS Style

Ondřej Holčapek; Pavel Reiterman; Petr Konvalinka. Changes of refractory composite’s mechanical properties due to different temperature loadings. THERMOPHYSICS 2018: 23rd International Meeting of Thermophysics 2018 2018, 1988, 020015 .

AMA Style

Ondřej Holčapek, Pavel Reiterman, Petr Konvalinka. Changes of refractory composite’s mechanical properties due to different temperature loadings. THERMOPHYSICS 2018: 23rd International Meeting of Thermophysics 2018. 2018; 1988 (1):020015.

Chicago/Turabian Style

Ondřej Holčapek; Pavel Reiterman; Petr Konvalinka. 2018. "Changes of refractory composite’s mechanical properties due to different temperature loadings." THERMOPHYSICS 2018: 23rd International Meeting of Thermophysics 2018 1988, no. 1: 020015.

Conference paper
Published: 10 July 2018 in INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017)
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The paper deals with the experimental study focused on the resistance of the high performance concrete (HPC) to elevated temperatures. Performed testing was carried out on the matured specimens of age 1 year. Studied HPC mixtures contained fine ceramic powder (CP) resulting during ceramic blocks production as a waste material. Used CP was dosed as a cement substitution up to 30% by mass. The resistance of studied concrete mixes was investigated by means of residual mechanical properties – compressive and flexural strength were determined. Thermal loading was conducted up to 600°C to omit explosive spalling. Performed experimental program confirmed great potential of CP as Portland cement replacement, because mixtures with CP application reached similar or slightly increased residual values in comparison with the control mixture. However, relative residual values by means of flexural strength were lower by 10%. CP presents interesting material for specific application.

ACS Style

Jaroslava Koťátková; Pavel Reiterman. Response of HPC incorporating mineral additive to thermal loading. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 2018, 1978, 250005 .

AMA Style

Jaroslava Koťátková, Pavel Reiterman. Response of HPC incorporating mineral additive to thermal loading. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017). 2018; 1978 (1):250005.

Chicago/Turabian Style

Jaroslava Koťátková; Pavel Reiterman. 2018. "Response of HPC incorporating mineral additive to thermal loading." INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 1978, no. 1: 250005.

Journal article
Published: 01 April 2018 in Construction and Building Materials
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ACS Style

Eva Vejmelková; Dana Koňáková; Magdaléna Doleželová; Lenka Scheinherrová; Petr Svora; Martin Keppert; Pavel Reiterman; Robert Černý. Effect of calcined Czech claystone on the properties of high performance concrete: Microstructure, strength and durability. Construction and Building Materials 2018, 168, 966 -974.

AMA Style

Eva Vejmelková, Dana Koňáková, Magdaléna Doleželová, Lenka Scheinherrová, Petr Svora, Martin Keppert, Pavel Reiterman, Robert Černý. Effect of calcined Czech claystone on the properties of high performance concrete: Microstructure, strength and durability. Construction and Building Materials. 2018; 168 ():966-974.

Chicago/Turabian Style

Eva Vejmelková; Dana Koňáková; Magdaléna Doleželová; Lenka Scheinherrová; Petr Svora; Martin Keppert; Pavel Reiterman; Robert Černý. 2018. "Effect of calcined Czech claystone on the properties of high performance concrete: Microstructure, strength and durability." Construction and Building Materials 168, no. : 966-974.