Shear strength and subterranean termite resistance of polystyrene impregnated sengon (Falcataria moluccana) glulam

Abstract

The purpose of this study is to evaluate shear strength and improve the resistance of glulam from sengon (Falcataria moluccana) wood through the preliminary treatment of polystyrene impregnation. Sengon laminas were impregnated with polystyrene and made into two-layer glulam using isocyanate adhesives. The glulam was tested for shear strength according to American Standard for Testing Materials D-905-98, and exposed to subterranean termite attack in the laboratory scale according to Indonesian standard SNI 7207-2014. The untreated glulam and solid wood were used as a comparison purposes, and the tested samples were six replicas. The polymer loading of polystyrene glulam was 28.7%. The results showed that shear strength of solid wood was not significantly different from glulam, it means that impregnation process of the styrene on sengon wood does not affect the gluing process. The polystyrene impregnated glulam had better resistant to termite attack than solid wood, but it was not significantly different from the untreated glulam. To get better resistance it could be further study for higher polymer loading in glulam manufacturing.

Color Change and Physical-Mechanical Properties of Polystyrene-Impregnated Glulam from Three Tropical Fast-Growing Wood Species

“…In other words, polystyrene impregnated in the lamina was not a significant obstacle in producing lamina that was as good as the untreated glulam in terms of shear strength. The shear strength result was in line with the study by Nurhanifah et al [26], who mentioned that untreated glulam was not significantly different from polystyrene glulam. All rubber-wood products had a shear strength of more than 5.2 MPa, and these rubber-wood products fulfilled the requirements of JAS 234-2003.…”

“…After impregnation with polystyrene, the color change (∆E) of manii, mangium, and rubberwood was 1.6, 1.9, and 1.8, respectively, and according to Hunter Lab [22], these values indicated a very small color change (∆E < 2.0). The color change of polystyrene glulam was in line with the findings reported by Nurhanifah et al [26], who made sengon polystyrene glulam. The small color changes were explained by polystyrene being transparent and not having any effect on changing the color.…”