KIZILAĞAÇ VE KAVAKTAN ÜRETİLEN TABAKALI KAPLAMA KERESTELERİN MEKANİK VE FİZİKSEL ÖZELLİKLERİ ÜZERİNE TABAKA KOMBİNASYONUNUN ETKİSİ

Lamine kaplama kereste (LVL) inşaat yapılarında kiriş, döşeme kirişi, başlıklar ve paneller olarak kullanılan bir mühendislik ürünü ağaç malzemedir. Bu çalışmada kızılağaç ve kavak’tan üretilen LVL’lerin fırın kurusu yoğunluk, denge rutubet miktarı, kalınlığına şişme ve su alma, çekme-makaslama direnci eğilme direnci, eğilmede elastikiyet modülü ve liflere paralel basınç direnci özellikleri üzerine tabaka kombinasyonunun etkisi incelenmiştir. LVL üretiminde kızılağaç kaplamaları, kavak kaplamaları ve üre formaldehit tutkalı kullanılmıştır. 10 faklı kombinasyonda LVL üretimi gerçekleştirilmiştir. LVL’lerin fırın kurusu yoğunluğu, denge rutubet miktarı, kalınlığına şişme ve su alma, çekme-makaslama direnci, eğilme direnci, eğilmede elastikiyet modülü ve liflere paralel basınç direnci değerleri sırasıyla TS 2472, TS 2471, TS EN 317, EN 314-1, TS 2474 and TS 2595 standartlarına göre belirlenmiştir. Bu çalışma sonucunda en yüksek eğilme direnci, eğilmede elastikiyet modülü, liflere paralel basınç direnci ve yoğunluk değerleri tüm tabakalarda kızılağaç kullanılan LVL’ler de elde edilmiştir. En yüksek çekme-makaslama direnci tüm tabakalarda kavak kullanılan LVL’lerde bulunmuştur. LVL üretiminde kavak kaplama kullanımının artması ile kalınlığına şişme ve su alma miktarında artış gözlemlenmiştir. Ayrıca laminasyonda kızılağaç kaplama kullanımının artması eğilme direnci, eğilmede elastikiyet modülü, liflere paralel basınç direnci ve yoğunluk değerlerini artırdığı gözlenmiştir.

Anahtar Kelimeler:

Tabakalı kaplama kereste (LVL), kızılağaç, kavak, tabaka kombinasyonu, mekanik ve fiziksel özellikler.

THE EFFECT OF PLY COMBINATION ON MECHANICAL AND PHYSICAL PROPERTIES IN LAMINATED VENEER LUMBER (LVL) MANUFACTURED FROM ALDER AND POPLAR

Laminated veneer lumber (LVL) is an engineering product material used as girders, beams, joist, headers, panels, etc. in construction. In this study, the effect of ply combination on oven-dry specific gravity, equilibrium moisture content, thickness swelling and water absorption, tensile-shear strength, modulus of rupture, modulus of elasticity and compression strength parallel to grain of LVL manufactured from alder and poplar was investigated. Alder veneer, poplar veneer and urea formaldehyde glue were used in LVL production. LVLs were produced in a total of 10 different combinations. Oven-dry specific gravity, equilibrium moisture content, thickness swelling and water absorption, tensile-shear strength, modulus of rupture, modulus of elasticity and compression strength parallel to grain of test samples were determined according to TS 2472, TS 2471, TS EN 317, EN 314-1, TS 2474 and TS 2595, respectively. Based on this study, the highest modulus of rupture, modulus of elasticity, compression strength and oven dry specific gravity values were obtained with alder veneers used in all plies. On the other hand, the highest tensile-shear strength values were obtained with poplar veneers used in all plies. With the rising in the use of poplar veneer in LVL production, an increase in the amount of thickness swelling and water absorption was observed. It was also observed that as contribution rate of alder veneer in lamination increases, oven dry specific gravity, modulus of rupture, modulus of elasticity and compression strength values were increased.

Keywords:

Laminated veneer lumber (LVL) Laminated veneer lumber (LVL), alder, poplar, ply combination, mechanical and physical properties.,

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