KARAKTERISTIK BALOK BAMBU LAMINA SUSUN TEGAK DARI BILAH BAMBU ANDONG (Gigantochloa pseudoarundinacea (Steud.) Widjaja)

Abstract

The objective of the study was to determine the effect of various layer compositions on the properties of 3-layer vertically glued laminated bamboo beam (LBB). Bamboo strips for LBB fabrication were prepared from mature culms (± 4 years old) of andong bamboo (Gigantochloa pseudoarundinacea (Steud.) Widjaja) collected from private gardens in West Java. The strips were pre-treated by soaking them in 7% boron solution for four hours. Three-layer LBBs were manufactured with six different layer compositions, including bamboo combination with wood planks of manii (Maesopsis eminii Engl.) or sengon (Falcataria moluccana (Miq.) Barneby & J.W. Grimes) as the core layer. The LBB was manufactured using Water Based Polymer-Isocyanate (WBPI) adhesive. The glue spread and cold pressing time 2 applied were 250 g/m and one hour, respectively. Results showed that the average density, moisture content, thickness 3 swelling, and width expansion of LBB were 0.65 g/cm ; 11.1%; 2.09%; and 1.99%, respectively. No delamination occurred in all samples using WBPI adhesive, which indicates high bonding quality. The average bonding strength and 2 percentage bamboo failure (dry test) of LBB were 61.6 kg/cm and 90%, respectively. The physical and mechanical properties of LBB were significantly affected by the layer composition. The presence of wood laminates as the core layer of LBB and the cross wide orientation of the core layer decreased mechanical properties of LBB. On the contrary, the presence of cross-layer in LBB structure increased dimensional stability of the produced LBB.Three-layer thick laminated bamboo beam made of vertically glued andong bamboo strips with various constituted layer composition and all constitued layers laminated together in parallel grain direction had strength values comparable to those of class II of solid wood strength, eventhough the core layer was made of sengon or manii planks.

Physical and mechanical properties of belangke (Gigantochloa pruriens) bamboo laminated boards modified with citric acid

“…In addition, Wulandari et al [25] also obtained lower MOR of 357.208 kg/cm 2 on a combination of sengon and bayur wood laminated boards. However, the MOR results of this study were lower than those of Sulistianingsih et al [27] andong bamboo laminated boards with an average MOR of 958.3 kg/cm 2 . Based on the value of MOR produced in this study, it decreased when treated with citric acid.…”

“…In addition, Sulistianingsih et al [29], the manufacture of laminated boards from Betung bamboo and nine bamboo produced a shear strength value of Betung bamboo with a value of 60 kg/cm 2 and nine bamboo laminated boards with a value of 65 kg/cm 2 . The results of this study are also lower when compared to that of Sulastianingsih et al [27] on the manufacture of laminated boards, a combination of Andong bamboo, sengon wood, and manii wood, which produced an average value of 61.6 kg/cm 2 .…”

“…The average moisture content in this study was 12.27%, which was the highest compared to Sulistianingsih's research. Sulistianingsih et al [27] reported that the moisture content value of Andong bamboo laminated boards has an average value of 11.1%. Belatrix et al [28] reported that the moisture content of laminated boards made from a combination of Betung and Ater bamboo had an average value of 12.12%.…”

“…The average value of research delamination is the highest compared to Sulistianingsih's research. Sulistianingsih et al [27] reported the Andong bamboo, sengon wood, and manii laminated board by immersing boron to get 0% results. In addition, the results of the delamination of this study were similar to the research of Hadi et al [20] on the manufacture of acacia and manii glue laminated (4%).…”

Improvement of physical and mechanical properties of belangke bamboo (Gigantochloa pruriens) laminated boards using boric acid immersion

“…The value of the laminated board delamination test has an average value that ranges from 2.37 to 7.77%. The delamination value of this study is higher than that of Sulastiningsih et al [28], who examined the manufacture of laminated boards from Andong bamboo using 7% boron solution immersion and obtained 0%. Based on the analysis of variance, delamination of laminated boards with boric acid immersion had no significant effect.…”