Effect of Thickness and Orientation Angle Combination to Physical and Mechanical Properties of Cross Laminated Timber Products from Manii Wood (Maesopsis eminii Engl.) Using Nails

Abstract

The limitation of natural forest wood makes the demand for public forest wood increases. As we know, quality of public forest wood as a structural material is still low. However, that can be overcome with the manufacture of Cross Laminated Timber products. CLT is created by arranging 3 to 7 laminas crossed and then glued and compressed hydraulically on the entire surface or can be nailed. One of modification CLT product is doing combination of lamina thickness and orientation angle. This study was aimed to explain and determine the effect of thickness combination and orientation angle to the characteristic of physical and mechanical properties of manii (Maesopsis eminii, Engl) CLT panels using nails (CLT-Nails). Materials used were manii boards and nails with 2.7 mm in diameter and 5.1 mm in length. The result of physical properties of CLT-Nails showed that the average distribution of density and shrinkage for any thickness combination and orientation angle relatively uniform or not significantly different, respectively from 0.40-0.47 g/cm3 and 4.28-6.67%. That’s contrast with moisture content and swelling which quite fluctuating, respectively from 14.64-16.49% and 2.42-6.34%. A3B4 and A1B5 panel has the highest water content levels, each one 16.46% and 16.49%.

Ketersediaan bahan baku kayu membuat konsumen beralih dari penggunaan kayu hutan alam ke kayu hutan rakyat untuk memenuhi kebutuhan strukturalnya. Keterbatasan kualitas dari kayu hutan rakyat sebagai bahan struktural dapat diatasi dengan pembuatan produk Cross Laminated Timber . CLT dibuat dengan menyusun 3 sampai 7 lamina secara bersilangan kemudian direkatkan dan dikempa hidrolik pada seluruh permukaannya atau dapat dengan dipaku. Salah satu modifikasi produk CLT adalah dengan melakukan kombinasi ketebalan lamina dan orientasi sudut. Tujuan dari penelitian adalah untuk menerangkan perilaku dan menentukan besar pengaruh kombinasi tebal dan orientasi sudut lamina terhadap karakteristik sifat fisis dan mekanis panel CLT dari kayu manii (Maesopsis eminii, Engl) menggunakan paku (CLT-Paku). Bahan yang digunakan untuk penelitian ini adalah papan-papan kayu manii dan paku diameter 2.7 mm dengan panjang 5.1 mm.