Wood-Cement Board Reinforced with Steel Nets and Woven Hemp Yarns: Physical and Mechanical Properties

Autor: Hossein Rangavar
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Drvna industrija
Volume 68
Issue 2
ISSN: 1847-1153
0012-6772
Popis: The aim of this study was to improve physical and mechanical properties of wood-cement boards and to determine optimum content of cement in the formulation. Hence, boards were reinforced with steel nets and woven hemp yarns adding cement to the dry mass of wood in the ratio of 2.5:1, 2.75:1 and 3:1. Physical and mechanical properties of wood-cement boards, such as water absorption (WA) and thickness swelling (TS) after 2 and 24 hour immersion in water, bending strength (MOR), modulus of elasticity (MOE) and internal bond strength (IB), were determined according to EN Standards. Results showed that reinforcement of boards with steel nets and 3 parts of cement added to the dry mass of wood improved all physical and mechanical properties. Properties of these boards showed a similar trend to the values of EN 634-2:2007 standard (specifications of cement bonded particleboards), except for modulus of elasticity, which was lower than minimum requirement.
Cilj istraživanja bio je poboljšati fizikalna i mehanička svojstva drvno-cementnih ploča i odrediti optimalan sadržaj cementa u njima. Ploče su ojačane čeličnim mrežama i tkanom konopljom. Sadržaj cementa u proizvedenim pločama bio je u omjeru 2,5:1; 2,75:1 i 3:1 u odnosu prema suhoj masi drvnog materijala. Fizikalna i mehanička svojstva drvno-cementnih ploča kao što su apsorpcija vode (WA) i bubrenje po debljini (TS) nakon 2 i 24 sata namakanja uzoraka u vodu, čvrstoća na savijanje (MOR), modul elastičnosti (MOE) i unutarnja čvrstoća vezanja (IB) određeni su prema europskim normama. Rezultati su pokazali da su ojačanjem ploča čeličnim mrežama i dodatkom trostruko veće količine cementa od suhe mase drvnog materijala poboljšana sva fizikalna i mehanička svojstva ploča. Svojstva tih ploča imaju vrijednosti slične vrijednostima što ih propisuje norma EN 634-2: 2007 (obilježja iverica s cementom), osim za modul elastičnosti, koji je za istraživane ploče bio manji od minimalno zahtijevanoga u normi.
Databáze: OpenAIRE
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