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Dr. Václav Nežerka
Department of Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 2077/7, 166 29 Praha 6, Czech Republic

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0 Experimental Mechanics
0 Image Analysis
0 Materials Science
0 Micromechanical modeling
0 Concrete recycling

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Micromechanical modeling

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Journal article
Published: 03 August 2021 in Construction and Building Materials
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Mixing, paving, and compaction of hot asphalt mixtures results in the formation of a three-phase system in which aggregates are represented in different fractions including subsieve particles (<0.063 mm), referred to as filler material. Larger particles interlock and form a skeleton, while the bituminous binder bonds individual grains together. Two filler types are commonly used for the production of asphalt mixtures: (i) lime, hydrated lime, or portland cement and (ii) fine particles retained in the separation units of a mixing plant (known as back/back-house filler) or those separated during aggregate production in quarries (quarry dust). We investigated the impact of several quarry dusts or back fillers as well as of selected treated by-products such as blast furnace slag, finely ground waste gypsum boards, or recycled concrete, all potentially applicable as alternative fillers. Different approaches were adopted to characterize these fillers and assess their impact on the adhesion between bitumen and aggregate in the presence of water, stripping resistance, and effect on the stiffness of the asphalt mixture. The results indicate that the effect of blast furnace slag or recycled concrete is superior to some conventional fillers and that mixing quarry dusts with portland cement or talc is beneficial for rendering the originally hydrophilic dusts more hydrophobic.

ACS Style

J. Valentin; J. Trejbal; V. Nežerka; T. Valentová; M. Faltus. Characterization of quarry dusts and industrial by-products as potential substitutes for traditional fillers and their impact on water susceptibility of asphalt concrete. Construction and Building Materials 2021, 301, 124294 .

AMA Style

J. Valentin, J. Trejbal, V. Nežerka, T. Valentová, M. Faltus. Characterization of quarry dusts and industrial by-products as potential substitutes for traditional fillers and their impact on water susceptibility of asphalt concrete. Construction and Building Materials. 2021; 301 ():124294.

Chicago/Turabian Style

J. Valentin; J. Trejbal; V. Nežerka; T. Valentová; M. Faltus. 2021. "Characterization of quarry dusts and industrial by-products as potential substitutes for traditional fillers and their impact on water susceptibility of asphalt concrete." Construction and Building Materials 301, no. : 124294.

Research paper
Published: 15 July 2021 in Experimental Techniques
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Commonly available digital image correlation (DIC) tools are designed to evaluate displacement/deformation fields using well-optimized correlation functions and computational procedures. However, real-time monitoring at high sampling rates or tracking motion at predefined locations from large sequence images can be hardly accomplished due to extreme computational costs. As shown in this paper, a lightweight approach based on the registration of subpixel subset shifts using discrete Fourier transform (DFT) can easily tackle large sets of images if the measurement is limited to discrete locations. A simple open-source python software designed for evaluation of displacements using virtual extensometers is described in this paper, along with the analysis of its performance. It is shown that the DFT-based algorithms outperform a commonly used DIC package in terms of computational efficiency and required user interactions, without sacrificing precision and accuracy.

ACS Style

V. Nežerka; P. Havlásek. A Lightweight DFT-Based Approach to the Optical Measurement of Displacements Using an Open-Source Python Code. Experimental Techniques 2021, 1 -12.

AMA Style

V. Nežerka, P. Havlásek. A Lightweight DFT-Based Approach to the Optical Measurement of Displacements Using an Open-Source Python Code. Experimental Techniques. 2021; ():1-12.

Chicago/Turabian Style

V. Nežerka; P. Havlásek. 2021. "A Lightweight DFT-Based Approach to the Optical Measurement of Displacements Using an Open-Source Python Code." Experimental Techniques , no. : 1-12.

Journal article
Published: 01 June 2020 in Materials Science Forum
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The mechanical properties of a cementitious composite are strongly affected by interfacial transition zone (ITZ) between the matrix and the aggregates, mainly by its strength and thickness. A micromechanical model based on Mori-Tanaka scheme coupled with an estimation of deviatoric stress in ITZ was developed for evaluation of the effect of selected secondary cementitious materials (SCMs – silica fume, fly ash and metakaolin) on the properties of ITZ in high-strength concrete (HSC). The model was validated by means of comparison of predicted ITZ thickness with direct ITZ thickness measurements performed by a combination of scanning electron microscopy and grid nanoindentation. Very good agreement between the theoretical and experimental results was reached, therefore the developed micromechanical model can be used for further research and optimization of HSC containing SCMs. Silica fume was determined to be the most efficient supplementary cementitious material from the point of view of ITZ thickness reduction.

ACS Style

Petr Bílý; Václav Nežerka; Vladimír Hrbek; Josef Fládr. Validation of Micromechanical Model for Prediction of ITZ Thickness of High-Strength Concrete Containing Secondary Cementitious Materials. Materials Science Forum 2020, 995, 143 -148.

AMA Style

Petr Bílý, Václav Nežerka, Vladimír Hrbek, Josef Fládr. Validation of Micromechanical Model for Prediction of ITZ Thickness of High-Strength Concrete Containing Secondary Cementitious Materials. Materials Science Forum. 2020; 995 ():143-148.

Chicago/Turabian Style

Petr Bílý; Václav Nežerka; Vladimír Hrbek; Josef Fládr. 2020. "Validation of Micromechanical Model for Prediction of ITZ Thickness of High-Strength Concrete Containing Secondary Cementitious Materials." Materials Science Forum 995, no. : 143-148.

Journal article
Published: 07 May 2020 in Construction and Building Materials
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Several researchers have considered waste marble sludge (WMS) as an admixture to cementitious composites. However, the scientific community is divided into two groups—one advocating WMS as a suitable microfiller, while the other claiming that WMS inhibits hydration of clinker minerals. Here, the role played by WMS during Portland cement (PC) hydration was placed under scrutiny. SEM-BSE microscopy, EDX analysis, porosimetry, and nanoindentation were employed for investigating the microstructure of cement pastes, and calorimetry for studying the rate of hydration. The impacts of hydration and microstructure development in the presence of WMS on mechanical properties of blended pastes were assessed using the resonance method and destructive tests. It was found that replacing PC with WMS by up to 15 wt% can lead to an increase of compressive and flexural strength because WMS lowers the porosity of pastes, contributing to a more homogeneous distribution of phases, and reinforces the brittle cementitious matrix. A weak transition zone around marble grains was observed, but this was not significant for WMS replacement at 15 wt% or less. Given the amount of WMS produced annually, its utilization for the production of building materials, even in relatively low concentrations, could potentially have a considerable impact on the sustainable reuse of WMS.

ACS Style

Z. Prošek; V. Nežerka; P. Tesárek. Enhancing cementitious pastes with waste marble sludge. Construction and Building Materials 2020, 255, 119372 .

AMA Style

Z. Prošek, V. Nežerka, P. Tesárek. Enhancing cementitious pastes with waste marble sludge. Construction and Building Materials. 2020; 255 ():119372.

Chicago/Turabian Style

Z. Prošek; V. Nežerka; P. Tesárek. 2020. "Enhancing cementitious pastes with waste marble sludge." Construction and Building Materials 255, no. : 119372.

Journal article
Published: 11 March 2020 in Construction and Building Materials
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Recent studies on utilization of recycled concrete have demonstrated that usually discarded finest fractions can be incorporated into cementitious composites without scarifying their structural performance. It has been shown that these fines can increase the resistance of a cementitious matrix to tensile stresses and reduce shrinkage, and that these effects can be boosted by addition of mineral admixtures. Such findings led us to a consideration that incorporating recycled concrete fines into a concrete mix could possibly mitigate aggregate-induced shrinkage cracking. Here, this hypothesis was put under scrutiny in a comprehensive experimental-numerical study, confirming that blending Portland cement with recycled concrete fines can mitigate inclusion-induced shrinkage cracking, especially when combined with fly ash. The results of coupled hygro-mechanical modeling indicate that incorporating recycled concrete fines leads not only to a decrease of shrinkage but also increases fracture energy and thus has a major impact on the reduction of micro-cracks between inclusions.

ACS Style

V. Nežerka; P. Havlásek; J. Trejbal. Mitigating inclusion-induced shrinkage cracking in cementitious composites by incorporating recycled concrete fines. Construction and Building Materials 2020, 248, 118673 .

AMA Style

V. Nežerka, P. Havlásek, J. Trejbal. Mitigating inclusion-induced shrinkage cracking in cementitious composites by incorporating recycled concrete fines. Construction and Building Materials. 2020; 248 ():118673.

Chicago/Turabian Style

V. Nežerka; P. Havlásek; J. Trejbal. 2020. "Mitigating inclusion-induced shrinkage cracking in cementitious composites by incorporating recycled concrete fines." Construction and Building Materials 248, no. : 118673.

Journal article
Published: 23 December 2019 in Resources, Conservation and Recycling
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The costs of construction waste handling, a scarcity of landfill sites, and requirements for sustainable construction have placed recycling of concrete—the most abundant construction material in the world—under scrutiny. Unlike recycling of aggregates, utilization of sub-sieve fractions from recycled concrete has not yet been adopted in the construction industry. In this study, we investigate the possibility of recovering residual anhydrous clinker embedded in grains of stripped mortar within these fines. Different samples of waste concrete were finely ground and studied using microscopy and chemical analyses to assess the amount of residual clinker. Its contribution to hydration processes was measured by calorimetry, and the impact of recycled concrete fines on mechanical properties of cement pastes was tested. The results indicate that residual anhydrous clinker is present in waste concrete and can be recovered by grinding. Replacing Portland cement with the recycled material in pastes led to a significant increase of tensile strength, while deterioration of compressive strength was negligible when the concrete fines contained higher amounts of residual clinker and when the amount of fines did not exceed 30% of Portland cement weight.

ACS Style

Zdeněk Prošek; J. Trejbal; V. Nežerka; V. Goliáš; M. Faltus; P. Tesárek. Recovery of residual anhydrous clinker in finely ground recycled concrete. Resources, Conservation and Recycling 2019, 155, 104640 .

AMA Style

Zdeněk Prošek, J. Trejbal, V. Nežerka, V. Goliáš, M. Faltus, P. Tesárek. Recovery of residual anhydrous clinker in finely ground recycled concrete. Resources, Conservation and Recycling. 2019; 155 ():104640.

Chicago/Turabian Style

Zdeněk Prošek; J. Trejbal; V. Nežerka; V. Goliáš; M. Faltus; P. Tesárek. 2019. "Recovery of residual anhydrous clinker in finely ground recycled concrete." Resources, Conservation and Recycling 155, no. : 104640.

Journal article
Published: 17 May 2019 in Cement and Concrete Composites
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The interfacial transition zone (ITZ) has a major detrimental impact on the structural performance of concrete. This negative impact can be modulated by introducing mineral admixtures to a concrete mix, which fill the excessive voids within ITZ and react with portlandite to form more compact products. The approach described here, consisting of characterization of phases and micromechanical modeling, enabled assessment of the effect of silica fume, fly ash, and metakaolin on ITZ thickness and strength. The proposed model was based on the Mori-Tanaka scheme coupled with an estimation of deviatoric stress within ITZ. This study suggests that silica fume is efficient in reducing ITZ thickness, while the addition of fly ash more significantly contributes to ITZ strength. Moderate replacements of Portland cement for silica fume or fly ash, up to 20%, can positively influence concrete performance; in case of metakaolin, replacement up to 10% is recommended.

ACS Style

V. Nežerka; P. Bílý; V. Hrbek; J. Fládr. Impact of silica fume, fly ash, and metakaolin on the thickness and strength of the ITZ in concrete. Cement and Concrete Composites 2019, 103, 252 -262.

AMA Style

V. Nežerka, P. Bílý, V. Hrbek, J. Fládr. Impact of silica fume, fly ash, and metakaolin on the thickness and strength of the ITZ in concrete. Cement and Concrete Composites. 2019; 103 ():252-262.

Chicago/Turabian Style

V. Nežerka; P. Bílý; V. Hrbek; J. Fládr. 2019. "Impact of silica fume, fly ash, and metakaolin on the thickness and strength of the ITZ in concrete." Cement and Concrete Composites 103, no. : 252-262.

Articles
Published: 25 April 2019 in Road Materials and Pavement Design
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Adhesion between bitumen and aggregates has a major impact on the performance of asphalt mixes. In order to avoid stripping and consequent premature failure of a pavement, methods to assess the adhesion have been developed and standardised. These methods, such as the frequently applied rolling bottle test defined in EN 1269-11, are based on visual inspection of specimens and subjective evaluation. This shortcoming can be eliminated by employing image analysis that accurately and consistently identifies the portion of aggregate covered by bitumen. However, the image segmentation procedure cannot be based purely on intensity thresholding because the light reflections on the glossy surface of bitumen merge together with light aggregates, and dark aggregates coincide with diffuse bitumen reflections. In this article, a method based on local entropy calculation is proposed to tackle this issue in the form of an open-source software tool. Its algorithms are thoroughly described here, and their impact is illustrated using a model example. Software outcomes are compared with an advanced, yet more complicated, approach. How the software might be used in other fields is also outlined and discussed.

ACS Style

V. Nežerka; J. Trejbal. Assessment of aggregate-bitumen coverage using entropy-based image segmentation. Road Materials and Pavement Design 2019, 21, 2364 -2375.

AMA Style

V. Nežerka, J. Trejbal. Assessment of aggregate-bitumen coverage using entropy-based image segmentation. Road Materials and Pavement Design. 2019; 21 (8):2364-2375.

Chicago/Turabian Style

V. Nežerka; J. Trejbal. 2019. "Assessment of aggregate-bitumen coverage using entropy-based image segmentation." Road Materials and Pavement Design 21, no. 8: 2364-2375.

Article
Published: 22 March 2019 in Experimental Techniques
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An open-source tool for a real-time measurement of relative displacements based on image registration is presented. The use of upsampled matrix-multiplication discrete Fourier transform and measurement limited to predefined points of interest by virtual extensometers allows high sampling frequencies with a subpixel accuracy. This solution was designed primarily for laboratory testing in order to eliminate the problem with inaccurate measurement of cross-head displacement due to compliance of testing frames and difficulties connected to the attachment of strain-gauges or extensometers. However, the portable hardware allows for outdoor applications in which remote monitoring of displacements and deformations is required. The accuracy of the system was assessed, and the software was successfully verified through experimental testing.

ACS Style

J. Antoš; V. Nežerka; Michael Somr. Real-Time Optical Measurement of Displacements Using Subpixel Image Registration. Experimental Techniques 2019, 43, 315 -323.

AMA Style

J. Antoš, V. Nežerka, Michael Somr. Real-Time Optical Measurement of Displacements Using Subpixel Image Registration. Experimental Techniques. 2019; 43 (3):315-323.

Chicago/Turabian Style

J. Antoš; V. Nežerka; Michael Somr. 2019. "Real-Time Optical Measurement of Displacements Using Subpixel Image Registration." Experimental Techniques 43, no. 3: 315-323.

Journal article
Published: 08 January 2019 in Construction and Building Materials
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Construction and demolition waste recycling for production of new concrete is usually limited to the use of coarse aggregates, and efficient utilization of fine subsieve fractions remains an unresolved issue. In the presented research, Portland cement pastes containing 50% finely ground recycled concrete, blended with lime, fly ash, or blast furnace slag, were studied. SEM-BSE microscopy, EDX analysis, and porosimetry were employed for investigating their microstructure, individual stages of hydration were detected using calorimetry, shrinkage was optically monitored in the early stages of hardening, the evolution of Young’s modulus was assessed using the resonance method, and strength was determined from destructive tests. The study suggests that recycled concrete fines can be incorporated into cementitious composites in large amounts and even improve their properties, especially when blended with fly ash or blast furnace slag. Substitution of Portland cement in the studied pastes by recycled concrete led to a compressive strength deterioration, but also a reduction of shrinkage, and an increase of the tensile strength in bending by up to 26%.

ACS Style

Z. Prošek; V. Nežerka; R. Hlůžek; J. Trejbal; P. Tesárek; G. Karra’A. Role of lime, fly ash, and slag in cement pastes containing recycled concrete fines. Construction and Building Materials 2019, 201, 702 -714.

AMA Style

Z. Prošek, V. Nežerka, R. Hlůžek, J. Trejbal, P. Tesárek, G. Karra’A. Role of lime, fly ash, and slag in cement pastes containing recycled concrete fines. Construction and Building Materials. 2019; 201 ():702-714.

Chicago/Turabian Style

Z. Prošek; V. Nežerka; R. Hlůžek; J. Trejbal; P. Tesárek; G. Karra’A. 2019. "Role of lime, fly ash, and slag in cement pastes containing recycled concrete fines." Construction and Building Materials 201, no. : 702-714.

Journal article
Published: 01 October 2018 in Composite Structures
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ACS Style

V. Nežerka; Michael Somr; T. Janda; J. Vorel; Martin Doškář; J. Antoš; J. Zeman; Jan Novák. A jigsaw puzzle metamaterial concept. Composite Structures 2018, 202, 1275 -1279.

AMA Style

V. Nežerka, Michael Somr, T. Janda, J. Vorel, Martin Doškář, J. Antoš, J. Zeman, Jan Novák. A jigsaw puzzle metamaterial concept. Composite Structures. 2018; 202 ():1275-1279.

Chicago/Turabian Style

V. Nežerka; Michael Somr; T. Janda; J. Vorel; Martin Doškář; J. Antoš; J. Zeman; Jan Novák. 2018. "A jigsaw puzzle metamaterial concept." Composite Structures 202, no. : 1275-1279.

Journal article
Published: 01 September 2018 in Journal of Cleaner Production
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ACS Style

V. Nežerka; V. Hrbek; Zdeněk Prošek; Michael Somr; P. Tesárek; J. Fládr. Micromechanical characterization and modeling of cement pastes containing waste marble powder. Journal of Cleaner Production 2018, 195, 1081 -1090.

AMA Style

V. Nežerka, V. Hrbek, Zdeněk Prošek, Michael Somr, P. Tesárek, J. Fládr. Micromechanical characterization and modeling of cement pastes containing waste marble powder. Journal of Cleaner Production. 2018; 195 ():1081-1090.

Chicago/Turabian Style

V. Nežerka; V. Hrbek; Zdeněk Prošek; Michael Somr; P. Tesárek; J. Fládr. 2018. "Micromechanical characterization and modeling of cement pastes containing waste marble powder." Journal of Cleaner Production 195, no. : 1081-1090.

Journal article
Published: 01 May 2018 in Cement and Concrete Composites
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Bonding between reinforcing fibers and a brittle cementitious matrix is the key ingredient for a ductile concrete production. Oxygen plasma treatment proved to be a promising technique for increasing the fiber surface adhesion to liquids, but a question about the stability of activated bonding when exposed to atmospheric conditions arises. We present a comprehensive study on deterioration of such treatment in time for different fibers commonly used as dispersed reinforcement. A microscopy investigation allowed to observe changes in the fiber surface morphology, while the changes in chemical bonds were detected by XPS analysis. To quantify the impact of plasma treatment and its deterioration, water contact angle measurements and pull-out tests were carried out. The results indicate that the exposure to atmospheric conditions has a negligible impact on fiber bonding, because surface roughening plays a major role. Therefore, fibers need not be incorporated into a concrete mix immediately after their treatment.

ACS Style

J. Trejbal; V. Nežerka; M. Somr; J. Fládr; Š. Potocký; Anna Artemenko; P. Tesárek. Deterioration of bonding capacity of plasma-treated polymer fiber reinforcement. Cement and Concrete Composites 2018, 89, 205 -215.

AMA Style

J. Trejbal, V. Nežerka, M. Somr, J. Fládr, Š. Potocký, Anna Artemenko, P. Tesárek. Deterioration of bonding capacity of plasma-treated polymer fiber reinforcement. Cement and Concrete Composites. 2018; 89 ():205-215.

Chicago/Turabian Style

J. Trejbal; V. Nežerka; M. Somr; J. Fládr; Š. Potocký; Anna Artemenko; P. Tesárek. 2018. "Deterioration of bonding capacity of plasma-treated polymer fiber reinforcement." Cement and Concrete Composites 89, no. : 205-215.

Article
Published: 12 January 2018 in Experimental Techniques
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We present a cheap solution for assessment of contact angles on sessile drops or menisci formed around partially submerged fibers. The proposed system consists of a simple optical set combined with an open-source software CAMTIA. The fully automatic assessment of contact angles is based on image binarization, identification of regions of interest, boundary smoothing, and contour differentiation. After initial setting of calculation parameters, there is no need for further interaction with the user. This eliminates the need for expensive commercial solutions or tedious manual placement of tangents, guarantees consistency in the assessment procedure, and allows fast bulk processing of images.

ACS Style

V. Nežerka; M. Somr; J. Trejbal. Contact Angle Measurement Tool Based on Image Analysis. Experimental Techniques 2018, 42, 271 -278.

AMA Style

V. Nežerka, M. Somr, J. Trejbal. Contact Angle Measurement Tool Based on Image Analysis. Experimental Techniques. 2018; 42 (3):271-278.

Chicago/Turabian Style

V. Nežerka; M. Somr; J. Trejbal. 2018. "Contact Angle Measurement Tool Based on Image Analysis." Experimental Techniques 42, no. 3: 271-278.

Journal article
Published: 01 May 2017 in Engineering Structures
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ACS Style

Michal Šejnoha; Tomáš Janda; Lenka Melzerová; Václav Nežerka; Jiří Šejnoha. Modeling glulams in linear range with parameters updated using Bayesian inference. Engineering Structures 2017, 138, 293 -307.

AMA Style

Michal Šejnoha, Tomáš Janda, Lenka Melzerová, Václav Nežerka, Jiří Šejnoha. Modeling glulams in linear range with parameters updated using Bayesian inference. Engineering Structures. 2017; 138 ():293-307.

Chicago/Turabian Style

Michal Šejnoha; Tomáš Janda; Lenka Melzerová; Václav Nežerka; Jiří Šejnoha. 2017. "Modeling glulams in linear range with parameters updated using Bayesian inference." Engineering Structures 138, no. : 293-307.

Journal article
Published: 01 February 2017 in Mechanics of Materials
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The purpose of this paper is to propose a continuum micromechanics model for the simulation of uniaxial compressive and tensile tests on lime-based mortars, in order to predict their stiffness, compressive and tensile strengths, and tensile fracture energy. In tension, we adopt an incremental strain-controlled form of the Mori-Tanaka scheme with a damageable matrix phase, while a simple $J_2$ yield criterion is employed in compression. To reproduce the behavior of lime-based mortars correctly, the scheme must take into account shrinkage cracking among aggregates. This phenomenon is introduced into the model via penny-shaped cracks, whose density is estimated on the basis of a particle size distribution combined with the results of finite element analyses of a single crack formation between two spherical inclusions. Our predictions show a good agreement with experimental data and explain the advantages of compliant crushed brick fragments, often encountered in ancient mortars, over stiff sand particles. The validated model provides a reliable tool for optimizing the composition of modern lime-based mortars with applications in conservation and restoration of architectural heritage.Comment: 21 pages, 12 figures, 1 tabl

ACS Style

Václav Nežerka; J. Zeman; J. Němeček. Micromechanics-based simulations of compressive and tensile testing on lime-based mortars. Mechanics of Materials 2017, 105, 49 -60.

AMA Style

Václav Nežerka, J. Zeman, J. Němeček. Micromechanics-based simulations of compressive and tensile testing on lime-based mortars. Mechanics of Materials. 2017; 105 ():49-60.

Chicago/Turabian Style

Václav Nežerka; J. Zeman; J. Němeček. 2017. "Micromechanics-based simulations of compressive and tensile testing on lime-based mortars." Mechanics of Materials 105, no. : 49-60.

Journal article
Published: 01 December 2016 in Key Engineering Materials
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Preliminary outcomes on a novel modular additive manufacturing technology are presentedin this contribution. The capabilities of the proposed system to synthesize materials with conventionalor meta properties are explored. Two limiting and a single mixed compositions are tested in com-pression in order to reveal both, global and local behaviours of the conglomerates. The experimentalmeasurements are supported by DIC (Digital Image Correlation) observations.

ACS Style

Václav Nežerka; Michael Somr; Tomáš Janda; Martin Doškář; Jan Zeman; Jan Novák. An Additively Manufactured Modular Metamaterial Composed of a Single Cell. Key Engineering Materials 2016, 722, 325 -330.

AMA Style

Václav Nežerka, Michael Somr, Tomáš Janda, Martin Doškář, Jan Zeman, Jan Novák. An Additively Manufactured Modular Metamaterial Composed of a Single Cell. Key Engineering Materials. 2016; 722 ():325-330.

Chicago/Turabian Style

Václav Nežerka; Michael Somr; Tomáš Janda; Martin Doškář; Jan Zeman; Jan Novák. 2016. "An Additively Manufactured Modular Metamaterial Composed of a Single Cell." Key Engineering Materials 722, no. : 325-330.

Journal article
Published: 01 November 2016 in Cement and Concrete Research
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ACS Style

J. Trejbal; L. Kopecký; P. Tesárek; J. Fládr; J. Antoš; M. Somr; Václav Nežerka. Impact of surface plasma treatment on the performance of PET fiber reinforcement in cementitious composites. Cement and Concrete Research 2016, 89, 276 -287.

AMA Style

J. Trejbal, L. Kopecký, P. Tesárek, J. Fládr, J. Antoš, M. Somr, Václav Nežerka. Impact of surface plasma treatment on the performance of PET fiber reinforcement in cementitious composites. Cement and Concrete Research. 2016; 89 ():276-287.

Chicago/Turabian Style

J. Trejbal; L. Kopecký; P. Tesárek; J. Fládr; J. Antoš; M. Somr; Václav Nežerka. 2016. "Impact of surface plasma treatment on the performance of PET fiber reinforcement in cementitious composites." Cement and Concrete Research 89, no. : 276-287.

Journal article
Published: 01 September 2016 in Key Engineering Materials
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This article discusses the potential impact of artificial drying to individual cells respectively cell wall, which pass through during the drying process to a rapid loss of water. Parameter of micromechanical properties was used to determine the effect of drying. New method, called "modulus mapping" was used to determine the mechanical properties on nano, micro level. It was found that the indentation modulus of artificially dried sample was lower than for naturally dried sample.

ACS Style

Zdeněk Prošek; Jaroslav Topič; Pavel Tesárek; Václav Nežerka; Vlastimil Králík. Modulus Mapping and its Use to Determine the Effect Process of Drying on the Cells of Spruce. Key Engineering Materials 2016, 714, 25 -28.

AMA Style

Zdeněk Prošek, Jaroslav Topič, Pavel Tesárek, Václav Nežerka, Vlastimil Králík. Modulus Mapping and its Use to Determine the Effect Process of Drying on the Cells of Spruce. Key Engineering Materials. 2016; 714 ():25-28.

Chicago/Turabian Style

Zdeněk Prošek; Jaroslav Topič; Pavel Tesárek; Václav Nežerka; Vlastimil Králík. 2016. "Modulus Mapping and its Use to Determine the Effect Process of Drying on the Cells of Spruce." Key Engineering Materials 714, no. : 25-28.

Journal article
Published: 08 April 2016 in Construction and Building Materials
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The paper focuses on the performance of various lime-based materials, alternative to Portland cement mortars, intended for application in repairing historic structures when subjected to mechanical loading. Results of basic material tests indicate that the use of metakaolin as a pozzolanic additive produces mortars with superior strength and sufficiently low shrinkage. Moreover, mortar strength can be further enhanced by the addition of crushed brick fragments, which explains the longevity of Roman concretes rich in pozzolans and aggregates from crushed clay products such as tiles, pottery, or bricks. An integrated experimental-numerical approach was used to identify key mortar parameters influencing the load-bearing capacity of masonry piers subjected to a combination of compression and bending. The simulations indicate increased load-bearing capacities for masonry piers containing metakaolin-rich mortars with crushed brick fragments, as a result of their superior compressive strength.

ACS Style

V. Nežerka; J. Antoš; J. Litoš; P. Tesárek; J. Zeman. An integrated experimental-numerical study of the performance of lime-based mortars in masonry piers under eccentric loading. Construction and Building Materials 2016, 114, 913 -924.

AMA Style

V. Nežerka, J. Antoš, J. Litoš, P. Tesárek, J. Zeman. An integrated experimental-numerical study of the performance of lime-based mortars in masonry piers under eccentric loading. Construction and Building Materials. 2016; 114 ():913-924.

Chicago/Turabian Style

V. Nežerka; J. Antoš; J. Litoš; P. Tesárek; J. Zeman. 2016. "An integrated experimental-numerical study of the performance of lime-based mortars in masonry piers under eccentric loading." Construction and Building Materials 114, no. : 913-924.