Outdoor Bamboo Strip Glulam Preparation And Properties Analysis

The paper focuses on the research on the manufacturing of bamboo strip glulam foroutdoor use, including bamboo strips pyrolysis and the hot-pressing process of bamboo stripglulam, and its performance. Bamboo strip pyrolysis temperature ranged in160℃,190℃, and210℃, temperature-rising rate were5℃/h,10℃/h, and15℃/h, and the pyrolysis time were1hour,2hours, and3hours. When the bamboo strips were hot-pressed into bamboo strip glulam,the temperature130℃,140℃, and150℃, the pressure2.0MPa,2.5MPa, and3MPa, and theglue-spread280g/m2,330g/m2,380g/m2were respectively adopted. Orthogonal test andanalysis of variance show that the effect of pressure on bending strength and the amount ofcompression of the board, and strip peeling ratio was first distinct outstanding and secondpressing temperature, With the analysis of the mechanical properties and economy, pressingtemperature130℃，pressing pressure2.0MPa, and glue-spread280g/m2were recommended.Elemental analysis demonstrated that after heat treatment at temperature160°C,190°C, and210℃, and the processing time2hours, the carbon element content of the bamboo samples rose0.95%,2.23%,5.73%respectively, the content of hydrogen reduced1.31%,4.6%,5.09%respectively, and the oxygen content reduced0.84%,1.76%,5.46%than contrast sample. Withinfrared ray(IR) analysis, the change region of cellulose, hemicellulose, lignin of bamboosamples after heat treated ranged mainly between1750cm-1-3850cm-1. These intervals belong tothe O-H stretching vibration area ketene, aldehyde C-H stretching vibration area, and theexpansion and contraction of the vibrating section of alkanet respectively, and thesedemonstrated that the binding functional group of bamboo samples had changed, and theintermolecular hydrogen bonds had been destroyed by heat treating. By the analysis of UVaging, surface wettability change and the color change,, the bamboo’s elements, groups andsurface color change caused by the temperature change during heat treatment were discussed inthe aspect of the macro and micro structure of bamboo to explore the causes of decliningmechanical properties of bamboo after heat treatment., these data provide a theoretical basis forits outdoor weathering performance changes.