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

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dc.contributor.authorMelichar, Tomášcs
dc.contributor.authorBydžovský, Jiřícs
dc.contributor.authorBrožovský, Jiřícs
dc.contributor.authorVacula, Miroslavcs
dc.coverage.issue1cs
dc.coverage.volume68cs
dc.date.issued2022-01-04cs
dc.description.abstractThe 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%).en
dc.description.abstractThe 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%).en
dc.formattextcs
dc.format.extent1-22cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationJOURNAL OF WOOD SCIENCE. 2022, vol. 68, issue 1, p. 1-22.en
dc.identifier.doi10.1186/s10086-021-02004-3cs
dc.identifier.issn1435-0211cs
dc.identifier.orcid0000-0003-1132-429Xcs
dc.identifier.orcid0000-0002-4139-2763cs
dc.identifier.orcid0000-0002-1547-3500cs
dc.identifier.other175556cs
dc.identifier.researcheridAAY-7481-2020cs
dc.identifier.researcheridAAH-5598-2021cs
dc.identifier.scopus54955810000cs
dc.identifier.scopus25637004500cs
dc.identifier.urihttp://hdl.handle.net/11012/203279
dc.language.isoencs
dc.publisherSpringercs
dc.relation.ispartofJOURNAL OF WOOD SCIENCEcs
dc.relation.urihttps://jwoodscience.springeropen.com/articles/10.1186/s10086-021-02004-3cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1435-0211/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectCement-bonded particleboarden
dc.subjectFinely ground limestoneen
dc.subjectCuttingsen
dc.subjectSecondary spruce chipsen
dc.subjectSudden changeen
dc.subjectTemperatureen
dc.subjectWateren
dc.subjectUltrasonicen
dc.subjectMicrostructureen
dc.subjectCement-bonded particleboard
dc.subjectFinely ground limestone
dc.subjectCuttings
dc.subjectSecondary spruce chips
dc.subjectSudden change
dc.subjectTemperature
dc.subjectWater
dc.subjectUltrasonic
dc.subjectMicrostructure
dc.titleStructural, physical and mechanical changes of cement-bonded particleboards during sudden fluctuations in temperature and moistureen
dc.title.alternativeStructural, physical and mechanical changes of cement-bonded particleboards during sudden fluctuations in temperature and moistureen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-175556en
sync.item.dbtypeVAVen
sync.item.insts2025.10.14 14:45:51en
sync.item.modts2025.10.14 10:00:48en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav technologie stavebních hmot a dílcůcs
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