Table 4 Analysis of variance of BN and DB woods glulam’s characteristics with varied glue mixtures
From: Bonding strength of benuang and duabanga glulams using their barks as phenol formaldehyde-filler
Parameter | Glue Mixtures | BN | DB | ||||
|---|---|---|---|---|---|---|---|
Mean | P-value | Remarks | Mean | P-value | Remarks | ||
MC (%) | A | 11.83 (0.18)a | 0.00 | ** | 11.00 (0.14)a | 0.00 | ** |
B | 11.72 (0.19)a | 10.12 (0.20)b | |||||
C | 11.63 (0.27)a | 10.21 (0.27)b | |||||
D | 11.22 (0.29)b | 10.17 (0.28)b | |||||
ρ (g/cm3) | A | 0.40 (0.02) | 0.51 | NS | 0.48 (0.02) | 0.63 | NS |
B | 0.41 (0.04) | 0.47 (0.04) | |||||
C | 0.43 (0.02) | 0.50 (0.02) | |||||
D | 0.41 (0.03) | 0.49 (0.03) | |||||
Boiling water delamination (%) | A | 0.00 (0.00) | – | NS | 0.00 (0.00) | – | NS |
B | 0.00 (0.00) | 0.00 (0.00) | |||||
C | 0.00 (0.00) | 0.00 (0.00) | |||||
D | 0.00 (0.00) | 0.00 (0.00) | |||||
Cold water delamination (%) | A | 0.00 (0.00) | – | NS | 0.00 (0.00) | – | NS |
B | 0.00 (0.00) | 0.00 (0.00) | |||||
C | 0.00 (0.00) | 0.00 (0.00) | |||||
D | 0.00 (0.00) | 0.00 (0.00) | |||||
Bonding strength (Kgf/cm2) | A | 52.36 (3.98) | 0.18 | NS | 69.30 (12.64) | 0.44 | NS |
B | 54.19 (5.32) | 70.04 (8.77) | |||||
C | 50.40 (8.85) | 75.89 (2.12) | |||||
D | 44.83 (7.42) | 77.18 (10.03) | |||||
Wood failure (%) | A | 94.00 (2.24) | 0.03 | NS | 32.00 (21.39) | 0.00 | ** |
B | 98.00 (2.74) | 77.00 (13.96) | |||||
C | 100.00(0.00) | 76.00 (18.17) | |||||
D | 97.00 (4.47) | 87.00 (12.04) | |||||