ASTM D5751:19 pdf download

ASTM D5751:2019 pdf download.Standard Specification for Adhesives Used for Laminate Joints in Nonstructural Lumber Products.
9.2.1 Dry Test—Follow the instructions in 9.1.1.
9.2.2 Boil Test—Place one group of 20 specimens (see Table
5) in a tank of boiling water, separated by stickers, wire screens, or other means, so that all surfaces are freely exposed to the water. Weight down the specimens and ensure that they are immersed for the duration of the boil cycle. Boil for 4 h. Dry for 20 h at 145 5°F (63 ± 3°C) with suflicient air circulation to lower the MC of the specimens to the original MC, within an allowable variation of ± 1 % MC. (See 7.3.) Determine the MC by removing a specimen at 18, 19, and 20 h and test with a moisture meter until the MC reading is in the desired range, or predetermine the time required to reach the desired MC by running samples. Repeat the 4-h boil cycle. Then remove the specimens and cool in running water at 65 to 80°F (18 to 27°C) for 1 h. Remove the specimens from the water, place in a plastic bag to prevent them from drying, and lest while wet within I h.
9.2.2. 1 Dry the specimens to less than 8 % MC and estimate the percentage of wood failure. (See 7.3.)
9.2.3 Elevated Temperature Test—Follow the instructions in
9.1.3.
9.2.4 Vacuum-Pressure Test—Place one group of specimens (Table 5) in a pressure vessel, separated by stickers, wire screens, or other means in such a manner that all surfaces can be freely exposed to the water. Weight down the specimens and fill the vessel with water at 65 to 80°F (18 to 27°C), and ensure that all specimens are immersed for the duration of the exposure cycle. Draw and maintain a vacuum of at least 25 in. Hg (84.4 kPa) for 30 mm. Release the vacuum, and follow immediately with pressure application of 75 ± 2 psi (517 ± 14 kPa) for 30 mm. Remove the specimens from the water, place in a plastic bag to prevent them from diying, and test while wet within 1 h. Dry the broken specimens to less than 8 % MC and estimate the percentage of wood failure. (See 7.3.)
10. Testing and Calculation
10. 1 Testing—With a shear tool of the type in 6.5, apply the load through a self-aligning seat to ensure uniform lateral distribution of the load and with a continuous motion of the movable head at a rate of 0.5 in. (12.8 mm)/min ± 10 %.
10.2 Determination of Average Wood Species Strength— Use Table 2 to obtain the average shear strength at 12 % MC for any species appearing on the tables. See Footnote A in Table 2 for information on adjusting for MC of the lumber. For species not appearing on the table, refer first to Test Methods D2555, and if necessary. to the Forest Product Laboratories Wood Handbook, latest edition. For any species not appearing in the above three sources, determine the average species strength by the instructions given in Test Methods D2555. Also, obtain information from Table 2 or the publications listed, as to whether the species should he classified as softwood or hardwood.