Partner: Krzysztof Schabowicz

Wrocław University of Technology (PL)

Recent publications
1.Schabowicz K., Jóźwiak-Niedźwiedzka D., Ranachowski Z., Kudela Jr. S., Dvorak T., Microstructural characterization of cellulose fibres in reinforced cement boards, ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING, ISSN: 1644-9665, DOI: 10.1016/j.acme.2018.01.018, Vol.18, No.4, pp.1068-1078, 2018
Abstract:

The microscopic analysis of the different cellulose fibre cement composites is presented. The observations of the fibres in optical microscope in transmitted light and in scanning electron microscope are described. The micro computed tomography (micro-CT) and SEM were used to determine the distribution of the fibres in the matrix. The investigated fibre cement boards were produced by extrusion process and panels were cured in natural conditions. The main goal of the research was application of different microscopic methods to analyze the fibres distribution as a result of a different methods of their production. Micro-CT was used for 3D visualization of fibres distribution in three different fibre cement boards. It was possible to determine the average diameter of the fibres and their concentration using the high-resolution mode of micro-CT scanning procedure. Finally, a procedure which can be applied as a useful tool for analysis of the different procedures used in production of fibre cement boards is described. This procedure can be successfully used in the quality control system of cellulose fibre distribution in cement composites

Keywords:

Cellulose fibre reinforced cement boards, Microstructure, Fibre distribution, X-ray microtomography, SEM-EDS analysis

Affiliations:
Schabowicz K.-Wrocław University of Technology (PL)
Jóźwiak-Niedźwiedzka D.-IPPT PAN
Ranachowski Z.-IPPT PAN
Kudela Jr. S.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Dvorak T.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
2.Ranachowski Z., Schabowicz K., Gorzelańczyk T., Kudela Jr S., Dvorak T., Visualization of Fibers and Voids Inside Industrial Fiber Concrete Boards, Material Science & Engineering International Journal, ISSN: 2574-9927, DOI: 10.15406/mseij.2017.01.00022, Vol.1, No.4, pp.1-4, 2018
Abstract:

Fiber cement boards (FCB) microstructure and methods of fabrication are described. The method of X-ray microtomography in application for investigating of FCB microstructure is presented. The cellulose fibers constituting the remarkable reinforcement of the FCB are colorless and too small to be seen applying the standard optical methods. The X-ray microtomography method however enabled the authors to realize three goals within the investigation of the properties of FCB. The length and shape of the fibers could be assessed on specimens’ cross-sections. Applying the pseudo 3D visualization it was possible to visualize the cracked regions inside the specimen volume. The case of non-uniform fibers distribution in respect to the board thickness which was impossible to recognize applying the standard visual inspection, was also performed by merging the multiple cross-section images into a single graph

Affiliations:
Ranachowski Z.-IPPT PAN
Schabowicz K.-Wrocław University of Technology (PL)
Gorzelańczyk T.-Wrocław University of Technology (PL)
Kudela Jr S.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Dvorak T.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
3.Ranachowski Z., Schabowicz K., The contribution of fiber reinforcement system to the overall toughness of cellulose fiber concrete panels, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2017.09.067, Vol.156, pp.1028-1034, 2017
Abstract:

The paper concerns the role of cellulose reinforcements in overall mechanical toughness of fiber concrete panels applied as facade building material. The results of mechanical tests performed on specimens in as delivered state as well as on specimens which underwent the procedure of destruction of internal fiber network structure due to pyrolysis are presented. The results of mechanical tests let the authors to calculate the work of fracture for six different mechanical conditions. Moreover the analysis of registered Acoustic Emission (AE) signal had revealed that the investigated process of destruction begins with the brittle crack generation and growth while major damages of reinforcement system appears in later phase of the process.

Keywords:

Fiber cement panels, Cellulose fibers, Brittle crack, Acoustic Emission

Affiliations:
Ranachowski Z.-IPPT PAN
Schabowicz K.-Wrocław University of Technology (PL)
4.Schabowicz K., Ranachowski Z., Jóźwiak-Niedźwiedzka D., Radzik Ł., Kúdela Jr S., Dvorak T., Application of X-ray microtomography to quality assessment of fibre cement boards, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2016.02.035, Vol.110, pp.182-188, 2016
Abstract:

In this paper a method of X-ray microtomography (micro-CT) was employed for a direct insight into a microstructure of fibre cement boards of different quality. Four specimens were subjects of examination. Two parameters were determined to characterize the level of compaction of fibres in concrete matrix: mean-square displacement of migrating virtual particles after 500,000 of time steps and a diffusive tortuosity. The results of the investigation had revealed that fibre cement boards differing in density produce different images after processing with micro-CT method. The effect of microstructure tightening due to saturation using dying agent was also detectable.

Keywords:

Fibre cement boards, Delamination of fibres, Computational modelling, X-ray microtomography

Affiliations:
Schabowicz K.-Wrocław University of Technology (PL)
Ranachowski Z.-IPPT PAN
Jóźwiak-Niedźwiedzka D.-IPPT PAN
Radzik Ł.-other affiliation
Kúdela Jr S.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Dvorak T.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
5.Dębowski T., Lewandowski M., Mackiewicz S., Ranachowski Z., Schabowicz K., Badania ultradźwiękowe płyt włóknisto-cementowych, PRZEGLĄD SPAWALNICTWA, ISSN: 0033-2364, Vol.88, No.10, pp.69-71, 2016
Abstract:

W artykule przedstawiona została możliwość lokalizacji delaminacji w płycie włóknisto-cementowej za pomocą specjalnie do tego celu skonstruowanego urządzenia wykorzystującego metodę ultradźwiękową i fale podłużne. Przeprowadzono badania na trzech rodzajach płyt. Stwierdzono, że proponowana metoda diagnostyczna umożliwia wykrywanie lokalnych nieciągłości, np. obszarów o obniżonej zwartości, czy delaminacji w płytach włóknisto-cementowych na obszarze średnicy wiązki metodą estymacji prędkości fali ultradźwiękowej. Zaletami metody są niewielkie wymiary urządzenia i krótki czas badania

Keywords:

płyty włóknisto-cementowe, badania nieniszczące, ultradźwięki

Affiliations:
Dębowski T.-IPPT PAN
Lewandowski M.-IPPT PAN
Mackiewicz S.-IPPT PAN
Ranachowski Z.-IPPT PAN
Schabowicz K.-Wrocław University of Technology (PL)

Conference papers
1.Ranachowski Z., Schabowicz K., Gorzelańczyk T., Lewandowski M., Cacko D., Katz T., Dębowski T., Investigation of Acoustic Properties of Fibre-Cement Boards, IEEE 2018, IEEE Joint Conference - Acoustics, 2018-09-11/09-14, Ustka (PL), DOI: 10.1109/ACOUSTICS.2018.8502341, pp.275-279, 2018
Abstract:

The paper describes two different techniques of ultrasound measurements performed in fibre cement boards, the material widely applied in building technology. An in-house device dedicated for fibre-cement board testing is also presented. To overcome the difficulty of determining the arrival time of the waveform of a longitudinal wave travelling across a thin and inhomogeneous body, a cross-correlation method of signal processing was proposed and applied

Keywords:

ultrasound, fibre-cement board, waveform cross correlation coefficient

Affiliations:
Ranachowski Z.-IPPT PAN
Schabowicz K.-Wrocław University of Technology (PL)
Gorzelańczyk T.-Wrocław University of Technology (PL)
Lewandowski M.-IPPT PAN
Cacko D.-IPPT PAN
Katz T.-IPPT PAN
Dębowski T.-IPPT PAN

Conference abstracts
1.Ranachowski Z., Lewandowski M., Schabowicz K., Logoń D., Analysis of Acoustic Emission Signal Generated in Mechanically Loaded Reinforced and Non-Reinforced Concrete Specimens, OSA 2017, LXIV Open Seminar on Acoustics, 2017-09-11/09-15, Piekary Śląskie (PL), DOI: 10.1515/aoa-2017-0059, No.42_3, pp.552, 2017

Patents
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórca / twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
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Ogłoszenie o udzieleniu patentu
pdf
417777
2016-06-30
BUP 02/17
2017-01-16
Dębowski T., Lewandowski M., Mackiewicz S., Ranachowski Z., Hoła J., Schabowicz K.
Sposób wykrywania delaminacji w płytach włókno-cementowych i urządzenie do wykrywania delaminacji w płytach włókno-cementowych
PL, Politechnika Wrocławska, Instytut Podstawowych Problemów Techniki PAN
227043
WUP 10/17
2017-10-31