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Mateusz Szymków
Faculty of Civil Engineering, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

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Journal article
Published: 18 June 2020 in Materials
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This paper presents the results of investigations into the effect of the use of recycled waste paper cellulose fibers on the properties of fiber cement boards subjected to contamination by moisture. Four series of fiber cement boards were tested. A reference fiber cement board manufactured without the use of recycled cellulose fibers constituted as one of the series. The other three series consisted of boards differing in their recycled cellulose fiber content-ranging from 10% to 50% of the total cellulose fiber content. Specimens of the fiber cement boards were subjected to contamination by moisture by storing them in water for 1–96 h. Subsequently, their basic physical and mechanical parameters, i.e., mass moisture content, absorbability, and modulus of rupture (MOR), were tested. Then, the specimens were investigated by means of acoustic emission during three-point bending. Artificial neural networks were employed to analyze the acoustic emission test results. The tests clearly showed the amount of recycled waste paper cellulose fibers and the length of storage in water to have an adverse effect on the boards, contributing to their degradation. This was reflected in the decrease of the acoustic emission (AE) events count recognized by the artificial neural networks, accompanying the rupture of fibers during the three-point bending of the specimens. In order to gain a more detailed insight into the changes taking place in the structure of the tested fiber cement boards, optical examinations were carried out by means of a scanning electron microscope. Interesting findings crucial for building practice were noted.

ACS Style

Tomasz Gorzelańczyk; Krzysztof Schabowicz; Mateusz Szymków. Tests of Fiber Cement Materials Containing Recycled Cellulose Fibers. Materials 2020, 13, 2758 .

AMA Style

Tomasz Gorzelańczyk, Krzysztof Schabowicz, Mateusz Szymków. Tests of Fiber Cement Materials Containing Recycled Cellulose Fibers. Materials. 2020; 13 (12):2758.

Chicago/Turabian Style

Tomasz Gorzelańczyk; Krzysztof Schabowicz; Mateusz Szymków. 2020. "Tests of Fiber Cement Materials Containing Recycled Cellulose Fibers." Materials 13, no. 12: 2758.

Journal article
Published: 23 May 2020 in Materials
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The aim of this study was to investigate the effect of plasterboards’ humidity absorption on their performance. Specimens’ hydration procedure consisted of consecutive immersing in water and subsequent drying at room temperature. Such a procedure was performed to increase the content of moisture within the material volume. The microstructural observations of five different plasterboard types were performed through optical and scanning electron microscopy. The deterioration of their properties was evaluated by using a three-point bending test and a subsequent ultrasonic (ultrasound testing (UT)) longitudinal wave velocity measurement. Depending on the material porosity, a loss of UT wave velocity from 6% to 35% and a considerable decrease in material strength from 70% to 80% were observed. Four types of approximated formulae were proposed to describe the dependence of UT wave velocity on board moisture content. It was found that the proposed UT method could be successfully used for the on-site monitoring of plasterboards’ hydration processes.

ACS Style

Zbigniew Ranachowski; Przemysław Ranachowski; Tomasz Dębowski; Adam Brodecki; Mateusz Kopec; Maciej Roskosz; Krzysztof Fryczowski; Mateusz Szymków; Ewa Krawczyk; Krzysztof Schabowicz. Mechanical and Non-Destructive Testing of Plasterboards Subjected to a Hydration Process. Materials 2020, 13, 2405 .

AMA Style

Zbigniew Ranachowski, Przemysław Ranachowski, Tomasz Dębowski, Adam Brodecki, Mateusz Kopec, Maciej Roskosz, Krzysztof Fryczowski, Mateusz Szymków, Ewa Krawczyk, Krzysztof Schabowicz. Mechanical and Non-Destructive Testing of Plasterboards Subjected to a Hydration Process. Materials. 2020; 13 (10):2405.

Chicago/Turabian Style

Zbigniew Ranachowski; Przemysław Ranachowski; Tomasz Dębowski; Adam Brodecki; Mateusz Kopec; Maciej Roskosz; Krzysztof Fryczowski; Mateusz Szymków; Ewa Krawczyk; Krzysztof Schabowicz. 2020. "Mechanical and Non-Destructive Testing of Plasterboards Subjected to a Hydration Process." Materials 13, no. 10: 2405.