Influence of wood properties and bonding parameters on bond durability of European Beech (Fagus sylvatica L.) glulams

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Table II

Delamination and block shear test results of MUF bonds with reference to lamella thickness (t_lam) and closed assembly time (CAT) – only unprimed specimens: maximum and mean delamination of specimens D_S and maximum delamination of individual bondlines D_B.

Beam type						Specimen D_S			Bondline D_B
		t_lam	CAT		N/n						f_v,BS	WFP
and series						Max	Mean		Max

		(mm)	(min)	Class		(%)	(%)	(%)	(%)	(%)	(N/mm²)	(%)
Laboratory	1	29	30	Short	2/4	4.2	1.4	1.3	18.4	18.4	16.4	99
manufactured	1	29	50	Long	2/4	1.8	1.2	1.3	4.3	18.4	12.9	96

	2	35	10	Short	2/4	16.0^a	12.8^a		36.8		13.3	91
			40	Short	2/4	9.6	5.2		27.9		14.1	91
			120	Long	2/4	5.1	2.3	4.6	24.5	36.8	15.4	97
			160	Long	2/4	2.1	1.5	4.6	10.4	36.8	14.8	100
	3	35	10	Short	2/4	4.2	1.7		10.3		13.2	96
		35	35	Long	2/4	9.1	4.2		29.1		14.2	94
		38	10	Short	2/4	34.2^a	26.0^a	13.2	77.4^a	77.4	14.0	74
		38	30	Long	2/4	0.8	0.3	13.2	3.8	77.4	13.6	99
ID	4	38	30	Short	11/11	59.3^a	38.1^a	37.3	100.0^a	100.0	12.5	70
ID	4	38	50	Long	3/3	43.4^a	34.7^a	37.3	88.0^a	100.0	13.6	74

Failed acc. to EN 386:2002; f_v,BS = block shear strength; WFP = wood failure percentage; ID = industrial manufactured; N/n = number of beams (N) and specimens (n).