Detail publikace

Structural, physical and mechanical changes of cement-bonded particleboards during sudden fluctuations in temperature and moisture

MELICHAR, T. BYDŽOVSKÝ, J. BROŽOVSKÝ, J. VACULA, M.

Originální název

Structural, physical and mechanical changes of cement-bonded particleboards during sudden fluctuations in temperature and moisture

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The paper presents research focused on behaviour of cement-bonded particleboards with modified composition during sudden changes of temperature and humidity. Four types of boards were made—one control and three modified ones. Finely ground limestone was used as a modifying component in binder. Secondary wood particles made from crushing cuttings of cement-bonded particleboards were used as chips substituent. Two sets of test specimens (1 set = 6 test specimens) were manufactured. The first set was stored in laboratory conditions. The second set was subjected to 10 cycles of sudden changes of temperature (− 20 °C to + 70 °C) and humidity in accordance with EN 321 (further in the paper referred to as “wet–frost–dry cycle”.) After each cycle, dimensions and mass of the test specimens as well as ultrasonic pulse velocity were determined. A detailed analysis of structural changes in boards during cycling was carried out by an optical microscope. After 10 wet–frost–dry cycles were completed, bending strength and modulus of elasticity in bending were determined. The analysis of test results implies a very good relation between change of ultrasonic pulse velocity and width of cracks in the area of interfacial zone between cement matrix and wood particles. This finding also corresponds with dimensional and volumetric changes of the boards. Dependence of bending strength and modulus of elasticity in bending on composition of boards is apparent. Positive influence of secondary spruce chips on dimensional changes of cement-bonded particleboards caused by sudden changes of temperature and humidity was proved. Finely ground limestone contributes to more resistant structure of boards which leads to improved bending properties. Adverse conditions had more considerable influence on bending strength (decrease by 21% to 26%) than on modulus of elasticity in bending (decrease by 12% to 19%).

Klíčová slova

Cement-bonded particleboard; Finely ground limestone; Cuttings; Secondary spruce chips; Sudden change; Temperature; Water; Ultrasonic; Microstructure

Autoři

MELICHAR, T.; BYDŽOVSKÝ, J.; BROŽOVSKÝ, J.; VACULA, M.

Vydáno

4. 1. 2022

Nakladatel

Springer

ISSN

1435-0211

Periodikum

JOURNAL OF WOOD SCIENCE

Ročník

68

Číslo

1

Stát

Japonsko

Strany od

1

Strany do

22

Strany počet

22

URL

https://jwoodscience.springeropen.com/articles/10.1186/s10086-021-02004-3

Plný text v Digitální knihovně

http://hdl.handle.net/11012/203279

BibTex

@article{BUT175556,
  author="Tomáš {Melichar} and Jiří {Bydžovský} and Jiří {Brožovský} and Miroslav {Vacula}",
  title="Structural, physical and mechanical changes of cement-bonded particleboards during sudden fluctuations in temperature and moisture",
  journal="JOURNAL OF WOOD SCIENCE",
  year="2022",
  volume="68",
  number="1",
  pages="1--22",
  doi="10.1186/s10086-021-02004-3",
  issn="1435-0211",
  url="https://jwoodscience.springeropen.com/articles/10.1186/s10086-021-02004-3"
}