Viktor Mechtcherine

Viktor Mechtcherine
Technische Universität Dresden | TUD · Institute of Materials Science

About

409
Publications
132,237
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11,004
Citations
Citations since 2016
281 Research Items
9918 Citations
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201620172018201920202021202205001,0001,5002,0002,500
201620172018201920202021202205001,0001,5002,0002,500

Publications

Publications (409)
Chapter
Refined physics-based models generally present a relevant number of parameters to calibrate against experimental data, which might be unavailable for the mixture or the service scenario of interest. This represents one of the most relevant issues in material modelling, especially when descriptive models are adapted to serve as predictive ones. Addi...
Conference Paper
Full-text available
Aufgrund seines hervorragenden Verhaltens gegenüber verschiedenen Beanspruchungen ist hochduktiler Beton (engl.: Strain-hardening cement-based composite, SHCC) ein vielversprechender Baustoff für eine Vielzahl an Anwendungen unter statischen, stoßartigen und zyklischen Belastungen. Für einen sicheren Materialeinsatz ist ein tieferes Verständnis des...
Conference Paper
Full-text available
Zusammenfassung Durch den Einsatz des 3D-Drucks mit Beton kann die Produktivität auf der Baustelle enorm gestei-gert, der gesamte Bauablauf optimiert und zugleich geometrische Freiheit ohne zusätzliche Kosten realisiert werden. Jedoch bevor der Beton-3D-Druck eine breite Anwendung finden kann, müssen einige Fragen in Bezug auf die Dauerhaftigkeit s...
Conference Paper
Full-text available
Existing reinforced concrete structures feature, as a rule, a relatively low resistance to various sorts of impact loading, such as shock, collision, or explosion. To this aim, the primary goal of the Research Training Group (in German: Graduiertenkolleg, GRK) 2250, funded by the Deutsche For-schungsgemeinschaft (DFG), is to bring substantial impro...
Article
Insufficient bonding behavior between intrinsically hydrophobic carbon fibers and water-based suspensions restricts the application of carbon fiber (CF) reinforced cements and other mineral building materials. To resolve this issue several researchers have investigated physical and chemical modification methods for enhanced load transfer from miner...
Article
Electrophoretic deposition (EPD) of nano-silica (NS) onto carbon fiber (CF) surfaces may considerably improve the bond properties toward cementitious matrices. In the article at hand, varied pH conditions (neutral, acidic, and alkaline environments) are studied during EPD for a tailorable interfacial bond. Zeta potential measurements and cyclic vol...
Article
Full-text available
Biochar is a waste-derived material that can sequester carbon at a large scale. The development of low-carbon and sustainable biochar-enhanced construction materials has attracted extensive interest. Biochar, having a porous nature and highly functionalised surface, can provide nucleation sites for chemical reactions and exhibit compatibility with...
Article
In this study, recycled carbon fibers (rCF) obtained from pyrolysis are utilized as reinforcements in fly ash-GGBS alkali-activated composites. Since the bond between the fiber and matrix is relatively poor, anodic oxidation was conducted by applying various voltages to enhance the interfacial interactions. Cyclic voltammetry (CV) was performed to...
Article
Although they are very efficient structures, concrete shells have lost popularity due to the complexity of the traditional construction process using cast-in-place concrete. A key concept to overcome the labor-intensive formwork in situ is the segmentation of the shells into prefabricated parts. In order to avoid individual formworks during prefabr...
Article
Full-text available
Concrete infrastructures are susceptible to corrosion in acidic environments; therefore, the constituent material should be engineered to sense the onset of ion penetration and propagation into the critical sites of the structure. Based on this concept, an intelligent alkali activated chemiresistor has been designed to sense the presence and concen...
Article
Full-text available
The load-bearing behavior and the performance of composites depends largely on the bond between the individual components. In reinforced concrete construction, the bond mechanisms are very well researched. In the case of carbon and textile reinforced concrete, however, there is still a need for research, especially since there is a greater number o...
Article
Strain Hardening Cement-based Composites (SHCC) holds great potential to be a remarkably effective material for shear strengthening of reinforced concrete beams in case of impact scenarios due to its great energy dissipation capability through the formation of multiple very fine cracks (∼100 μm of width). The effectiveness of this technique is inve...
Article
This work aims to evaluate the effect of alkali treatment on sisal fibers to improve the fiber properties and the effectiveness of their use as reinforcement in cement-based matrices. Alkaline solution concentration (1, 5 and 10 wt% NaOH) and post-treatment protocol (use of distilled water or acetic acid) influence were evaluated. The physical, che...
Article
This article focuses on the specifics in characterizing the properties of additively manufactured, cement-based materials in their hardening and hardened states. Such characterization is required for the material development, structural design, and quality control of both printable material and 3D-printed elements. The related challenges are associ...
Article
The bond of textile reinforcements towards concrete matrices plays an important role in the mechanical performance of Textile Reinforced Concretes, and the textile impregnation material is a crucial factor. In this work, the bond between different carbon yarns towards a concrete matrix was evaluated at elevated temperatures. A lab-developed cement-...
Article
Full-text available
Textile reinforcements have established themselves as a convincing alternative to conventional steel reinforcements in the building industry. Due to their high load-bearing capacities in addition to a smaller concrete cross section required, the bond between textile and concrete is extremely important. In contrast to ribbed steel bars ensuring a st...
Article
Full-text available
Extrusion-based 3D Concrete Printing (3DCP) is rapidly gaining popularity in the construction industry. Trial projects are now being realized at an increasing rate around the world to test the viability of the technology against real-world requirements. This step, from the ‘simple’ deposition of filaments of self-stable concrete to its application...
Chapter
Additive manufacturing with concrete, also often called 3D concrete printing (3DCP), has been gaining land speedily in recent years. This technology not only opens up higher productivity and relieves labor of heavy work, but also offers completely new design possibilities. Here, novel architectural form languages and design approaches can be develo...
Chapter
This paper presents the performances of a 3D printable ductile fiber-reinforced geopolymer composite (3DP-DFRGC). An ambient temperature cured one-part geopolymer was utilized as the binder for manufacture of the developed 3DP-DFRGC, which eliminates the necessity for curing at elevated temperature and handling of user-hostile alkaline solutions. H...
Article
Full-text available
The article at hand is envisaged to enumerate significant technological parameters for the successful impregnation of carbon fiber rovings having 50,000 (50 K) filaments, each within a fine-grained, cementitious suspension. Parameters such as the number of rollers as well as the influence of roller deflection and rotation have been investigated and...
Article
The paper at hand deals with the surface functionalization of polyethylene (PE) fibers by using tannic acid/ethanolamine (TA/EA) as an affordable and highly effective approach in enhancing the bonding characteristics in cement-based matrices. Surface morphology, charge formation, wetting behavior, and thermal properties of the fibers were investiga...
Article
Strain-hardening, cement-based composites (SHCC) are a novel class of fiber-reinforced concretes which exhibit high tensile strain capacity and crack control prior to failure localization, making them suitable for application as strengthening layers or as main materials for construction elements exposed to severe loading and environmental condition...
Article
Despite all their advantages, load-bearing concrete shell structures with double curvatures are not frequently in use. The main reason is the complexity of their construction. In such a context, this article starts with a brief, critical review of existing technologies while their pros and cons are highlighted. Against that background, the authors...
Article
In this investigation, a two-phase design strategy based on the composite of mortar phase and coarse aggregate phase is proposed for designing 3D printable concrete (3DPC) with coarse aggregate. Coussot model and Krieger-Dougherty model were utilized to establish a quantitative relationship between the rheological property of 3DPC and the volume fr...
Article
Several million cubic meters of concrete are pumped daily, as this technique permits fast concrete placement. Fundamental research has been performed and practical guidelines have been developed to increase the knowledge of concrete behavior in pipes. However, the pumping process and concrete behavior are not fully understood. This paper gives an o...
Article
3D–Printed concrete (3DPC) at early-ages often collapses during the printing process owing to insufficient buildability, which affects continuous printing. To correctly simulate the buildability of early-age 3DPC, a finite element (FE) model with the Drucker–Prager (D–P) model reflecting the fundamental concrete material properties was proposed. Th...
Preprint
Full-text available
One of the major limitations of the current 3D-concrete-printing technology is incorporation of reinforcement. Furthermore, there is a need to decrease the ecological footprint of printable concrete. As a possible solution for these challenges, this paper presents a 3D-printable strain-hardening geopolymer composite (3DP-SHGC) that shows pseudo-duc...
Preprint
Full-text available
Shell-like, double curved and thus above-average performance structures, are usually produced monolithically on site. For industrial advancement, however, they must be divided into transportable modules which can be assembled on the construction site (design for assembly). Models are lattice shells made of steel and glass, in which predominantly fl...
Preprint
Full-text available
Despite all their advantages, load-bearing concrete shell structures with double curvatures are not frequently in use. The main reason is the complexity of their construction. In such a context, this article starts with a brief, critical review of existing technologies while their pros and cons are highlighted. Against that background the authors t...
Article
Die Beton‐3D‐Druck‐Technologie entwickelt sich sehr dynamisch und findet zunehmend praktische Anwendung. Die Integration von lastabtragender Bewehrung stellt jedoch weiterhin eine Herausforderung dar. Der vorliegende Aufsatz stellt drei neue Verfahren zur Herstellung von Stahlbetonvollwänden vor, die auf der von den Autoren entwickelten CONPrint3D‐...
Article
Static yield stress is the most vital rheological parameter affecting the printability of concrete for additive manufacturing technologies based on layered extrusion. According to the theoretical analysis on the relationship between the static yield stress and the concrete composition, the components of 3D printable concrete (3DPC) can be divided i...
Article
Full-text available
This paper presents a comparison between indirect methods for assessing the buildability of 3D printed cementitious materials, including constant rotational velocity (CRV) or constant shear rate (CSR) test using rotational rheometry, unconfined uniaxial compression test (UUCT), a newly proposed confined uniaxial compression test (CUCT), and fast pe...
Chapter
Die Umsetzung innovativer Konzepte, wie digitale Betonherstellung und Prozessautomatisierung, könnte zu einer Steigerung der Produktivität und zu einer Verringerung des Materialbedarfs im Betonsektor führen. Das weltweite Interesse und der Umfang von Forschungs‐ und Innovationsaktivitäten auf diesem Gebiet nehmen in den letzten Jahren exponentiell...
Article
Full-text available
The creation of concrete shells from customized prefabricated modules is a novel approach that facilitates the construction of free-form surfaces considerably. In the framework of the Adaptive Concrete Diamond Construction (ACDC) project at TU Dresden, a material for 3D printing of the outer contours of such modules has been developed based on the...
Article
Full-text available
3D concrete printing is becoming more and more popular, not only in research but also in practice of construction. One of the main challenges however remains the integration of reinforcement. This publication focuses on the use of continuous fibers for this purpose. The special feature of the new type of carbon yarns applied is the mineral impregna...
Article
Full-text available
3D concrete printing (3DCP) has all the chances to become the future of the construction industry, but this technology is not yet widely applicable. One of the main challenges still to be mastered is the difficulty of reinforcing printed structures. At this point, many reinforcement strategies have already been proposed, which are fully or partiall...
Article
Product quality and processing of additively manufactured concrete components strongly depend on the flow processes during material extrusion. To control layer deformations and enable purposeful design, numerical analyses with varying process and material parameters were performed to obtain a deeper understanding of flow processes and forces develo...
Article
A scale-linking, experimental study complemented by an analytical model was carried out to investigate the influence of fiber orientation on the crack-opening behavior of strain-hardening cement-based composites (SHCC). Three SHCC compositions were investigated with polyvinyl alcohol (PVA) and ultra-high molecular weight polyethylene (UHMWPE) fiber...
Article
The objective of this investigation was to find a suitable methodology to disperse and mix two different types of cellulose-based materials, microcrystalline cellulose (MCC) and nano-fibrillated cellulose (NFC), into cement pastes. To achieve this, six different dispersion strategies were explored, including mechanical means, i.e., mechanical and m...
Article
This research aims to illuminate the effect of precursor nature on the rheology of alkali-activated materials (AAM) for providing some understandings for the precursor selection and mixture design of 3D-printing AAM (3DPAAM). Binary AAM pastes were prepared with several precursors, including ground granulated blast-furnace slag (GGBFS), fly ash (FA...
Article
Considering that structures destined for civil construction are commonly subjected to confinement loadings, triaxial testing is already standard for the characterization of cementitious materials, and novel methods to validate or explain the macro mechanical responses are needed. Since the macro behavior is linked to the behavior of the meso and mi...
Article
Electrophoretic deposition of nano-silica on the surfaces of carbon fibers (CF) is a novel approach for modifying the interfacial bond properties between the fibers and cementitious matrices. To understand its pullout behavior with increasing age, single fiber pullout tests and scanning electron microscopy were performed at various curing times for...
Chapter
3D printing is offering a totally new construction method, but an in-depth understanding of the consequences of the different production conditions compared to traditional formwork-based casting operations is required. Bulk material properties (intrinsic strength and durability) will follow the same fundamental material laws. However, in printed st...
Chapter
The comprehending of the processes’ physics is a prerequisite for the purposeful design and optimization of digital fabrication systems, as well as their efficient and robust process control. This chapter presents an overview of the underlying physics relevant to an understanding of the processing of cement-based materials during various production...
Chapter
The form freedom enabled by digital fabrication with concrete technologies provides advantages for a wide range of concrete based objects, from architectural to structural elements. The current chapter focuses on the specifics of structural design and engineering of DFC with emphasis on those technologies based on Additive Manufacturing with extrus...
Chapter
The need for methods for forming concrete has existed for as long as concrete has been used in constructing the built environment. Creating flat, rectilinear formers have traditionally been the cost and time efficient default for the majority of applications. The desire for greater design freedom and the drive to automate construction manufacturing...
Article
Interest in geopolymers (GP) has been continuously increasing due to their comparable-to-concrete mechanical properties and enhanced durability characteristics. Despite their chemical stability at high temperatures, the brittle nature of geopolymers may prevent their use in applications requiring inelastic deformability, e.g., strengthening layers...
Article
Biochar is a waste-derived carbon-based material that can sequester carbon. This study proposed a revolutionary design of carbon-negative concrete with a large volume of biochar incorporation and elaborated the roles of biochar in the cement hydration and microstructure development of biochar-augmented concrete. Moreover, the total CO2 emissions an...
Chapter
Strain-Hardening Cement-Based Composites (SHCC) are a material class of short-fiber-reinforced concretes which has a strain-hardening behavior due to micromechanical adaptation of the concrete matrix to the short fibers under tensile stress after occurrence of the initial concrete failure. Since its first scientific description in the early 90s, th...
Chapter
Strain-hardening geopolymer composites (SHGC) show increased deformation capacity due to a multiple cracking tolerance under tensile loading. To evaluate their mechanical performance, a common metakaolin-based mixture was produced. Three types of short fibers were evaluated as disperse reinforcement: polyvinyl alcohol (PVA), ultra-high molecular we...
Chapter
Polypropylene (PP)-fibers are one of the most widely used polymer fibers for several different applications in fiber reinforced concrete due to their availability, low price, chemical inertness and stability in high alkaline environment. In order to improve the fracture energy and toughness of fiber-reinforced mineral-based composites under impact...
Chapter
Mineral-impregnated carbon-fiber (MCF) composites are for the construction industry a promising alternative to steel reinforcement or conventional fiber-reinforced polymer (FRP) composites due to their high mechanical performance over a wide temperature range, corrosion resistance, and high technological flexibility. For an efficient industrial fab...
Chapter
Full-text available
In recent years, the development of digital construction methods such as 3D concrete printing (3DCP) has attracted increasing interest by the construction industry. 3DCP has a potential to solving many problems currently encountered in this business sector. At the same time, the urgent need in introducing sustainable binders such as limestone calci...
Chapter
Driven by promising efficiency gains, 3D concrete printing is rapidly evolving. To facilitate the transfer of the findings into construction practice, it is recommended to develop concretes within the specifications of standards. It is shown, that limiting the fine particle content is a major challenge. A generalizable, numerically supported applic...
Chapter
The article at hand presents an approach for analyzing the 3D Concrete Printing (3DCP) by means of the Discrete Element Method (DEM). An advanced user-defined simulation material model for fresh printable concrete has been developed to simulate extrusion, discharge and deposition. In addition, a calibration procedure is shown to find a fitting para...
Conference Paper
Angetrieben von vielversprechenden Effizienzsteigerungen wird der Beton-3D-Druck stetig weiterentwickelt. Um die gewonnenen Erkenntnisse niederschwellig in die Baupraxis zu überführen, empfehlen sich druckbare Betone im Rahmen des geltenden Regelwerks. Dabei stellt die Limitierung des Mehlkorngehalts eine Herausforderung dar. Um diese zu meistern,...
Conference Paper
Beim Fördern von Transportbeton mittels Betonpumpen kann es zum unvorhergesehenen Blockieren der Förderleitung kommen. Die Ursachen dafür sind oftmals nicht offensichtlich und können mit rheologischen Eigenschaften des Frischbetons bzw. mit seinem Entmischungsverhalten, der Pumpleitungsgeometrie oder der Pumptechnik zusammenhängen. Die hohe Anzahl...
Conference Paper
Durch den Einsatz des 3D-Drucks mit Beton kann die Produktivität auf der Baustelle enorm gesteigert, der gesamte Bauablauf optimiert und zugleich geometrische Freiheit ohne zusätzliche Kosten realisiert werden. Jedoch bevor der Beton-3D-Druck eine breite Anwendung finden kann, müssen einige Fragen in Bezug auf die Dauerhaftigkeit sowie die Gebrauch...
Conference Paper
Mit der neuartigen Bauweise der additiven Fertigung wurden verschiedene Strukturen aus Carbonbeton hergestellt. Die in diesem Beitrag thematisierte Besonderheit ist die Verwendung von Carbonbewehrung mit mineralischer Tränkung, die es ermöglicht, den Verbund zur Betonmatrix zu verbessern und das volle Potential der digitalen Fertigung im Hinblick a...
Conference Paper
Die weltweite Veränderung der klimatischen Bedingungen macht eine deutliche Verringerung des globalen Ausstoßes von Treibhausgasen unumgänglich. Der Bausektor und insbesondere die Zementherstellung sind von diesen Entwicklungen nicht ausgenommen, weshalb die Suche nach alternativen, nachhaltigen Baumaterialien verstärkt in den Fokus der Industrie u...
Conference Paper
Conventional construction of concrete shells involves a costly and time-consuming erection of custom formwork. An alternative approach that avoids this is an on-site assembly of shells from prefabricated modules. This article presents a new, highly automated method for the production of such modules. The proposed method combines the technology of f...
Conference Paper
In diesem Beitrag wird ein Vergleich zwischen indirekten Testmethoden zur Bewertung der Verbaubarkeit von 3D-gedruckten Mörteln und Betonen vorgestellt. Die Untersuchungen erfolgten an extrudierten Proben von acht zementbasierten Mischungen mit unterschiedlichem rheologischen Verhalten. Auf der Basis der erzielten Ergebnisse werden Vorhersagen zum...
Conference Paper
Das Erkennen und die Lokalisierung kritischer Risse ist ein wesentlicher Schlüssel für eine sichere und nachhaltige Bauwerksnutzung. In diesem Beitrag wird ein neuartiges, kostengünstiges Sensorsystem vorgestellt, das zur Echtzeit-Zustandsüberwachung von sowohl neuen als auch Bestandsbauwerken geeignet ist. Erste Ergebnisse zeigen, dass das System...
Conference Paper
Sehr viele Infrastrukturbauwerke haben bereits eine hohe Nutzungsdauer hinter sich und müssen instandgesetzt oder neu errichtet werden. Im Zuge der aktuellen Bestrebungen, mit möglichst geringen Materialeinsätzen die notwendige Bauwerkssicherheit zu erzeugen, rücken dünne Instandsetzungsschichten immer häufiger in den Fokus der Planenden. Aufgrund...
Conference Paper
Full-text available
A mechanical testing device was developed for testing the behavior of mineral-bonded composites under impact shear loading. The device is based on the well-known double shear specimen configuration and was designed to be used in a gravity split-Hopkinson tension bar (SHTB), enabling shear testing at high loading rates. In this work, results from im...
Article
The effects of signal frequency as well as curing time and moisture content on the dielectric properties of concrete have been investigated. Microwave dielectric material characterization was performed on two ordinary concrete mixtures varying in their aggregate composition and water-to-binder ratio (w/b). Moisture content, complex permittivity and...
Article
The article at hand presents a novel approach to accelerating the early strength development of mineral-impregnated carbon-fibre composites (MCF) by electrical Joule heating. MCF were produced with a metakaolin-based geopolymer suspension and subsequently cured using Ohmic heating under systemically varied voltages and durations. The MCF produced w...
Article
Full-text available
The mechanical behaviour of strain-hardening cement-based composites (SHCC) under monotonic tensile loading has been the subject of research for many years. The recent research on the SHCC’s performance under cyclic loading has enabled the identification of a wide variety of damage phenomena different to those observed under monotonic loading. The...