Document Type : Research Article


1 Latvia University of Agriculture, Forest Faculty, Jelgava, LV-3001, Latvia

2 Gent University, Laboratory of Wood Technology - Woodlab, Gent, B-9000, Belgium


Research describes softwood – pine (Pinus sylvestris L.) and spruce (Picea abies [L.] Karst) and hardwood – birch
(Betula pendula Roth) binding with inorganic geopolymer binder, the main focus is on the softwood and geopolymer
binding principles. Geopolymer binder is formed from calcined clay and liquid glass. The research describes
geopolymer binder compositions with various ratios of liquid glass and clay. This research focuses on mechanical
strength of bonded wood samples in shear test and on visualization of binder in three dimensions using X-ray computed tomography with submicron resolution. The scan results are compared with mechanical strength test results. The results
of the research shows, that inorganic binder with spruce wood can achieve 7 MPa shear strength. The research describes binding principles that function between wood and geopolymer and explains the main reasons for destruction of joint. Copyright © 2017 VBRI Press.


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