LY/T 3228-2020Preservative pressure-treated glulam (English PDF)

5.1 Raw material requirements

5.1.1 Shelves

The same tree species or different tree species with similar wood properties, good permeability and easy to do anti-corrosion treatment should be used as the laminate. All laminates the difference in moisture content should be < 5%. The quality of the laminate should meet the requirements of GB/T 26899-2011.

5.1.2 Adhesive

Should meet the requirements of GB/T 50708-2012.

5.1.3 Preservatives

Should meet the requirements of GB/T 27654.

5.1.4 Physical and mechanical properties

It shall meet the requirements of GB/T 26899-2011, GB 50005, and GB 50206.

5.2 Product quality requirements

5.2.1 Appearance quality

The surface of pressurized anti-corrosion treatment glulam should have no visible deposits of antiseptic, and no obvious defects such as cracks, twists, and bends.

5.2.2 Moisture content

The moisture content of pressurized anti-corrosion treatment glulam should be between 8% and 15% in the north and between 8% and 18% in the south.

It can also be agreed by both parties.

5.2.3 Physical and mechanical properties

The physical and mechanical properties of pressurized anti-corrosion treatment glulam shall meet the requirements of GB/T 26899.

5.2.4 Drug loading

The loading capacity of commonly used preservatives for pressurized preservative treatment of glulam should meet the requirements of Table 2.The loading capacity of other preservatives should comply with GB/T 27651 Requirements.

Note. NR means it is not recommended.

5.2.5 Penetration

5.2.5.1 Category C1

The penetration rate of the preservative in the exposed sapwood should be >=85%, and there is no requirement for the heartwood.

5.2.5.2 Category C2

5.2.5.3 C3.1, C3.2 category

The penetration rate of the preservative in the exposed sapwood should be >=90% and meet one of the following conditions.

1) Glulam thickness <=35 mm, preservative penetration on the exposed surface or end of the heartwood >=5 mm; Glulam thickness >35 mm, preservative Penetrate >= 8 mm on the exposed surface or end of the heartwood.

2) When preservatives are allowed to not penetrate the heartwood, it should be satisfied at the same time. In each laminate, the area of the heartwood (S1) is smaller than the area of the end face of the laminate (S1 S2) the depth (L1) does not exceed 50% of the end surface distance (L2), and the width (L3) does not exceed 50% of the distance between the two sides of the end surface (L4) (Figure

Figure 3 Schematic diagram of cross section of glulam laminate

5.2.5.4 Category C4.1

The penetration rate of the preservative in the sapwood should be >=90% and meet one of the following conditions.

1) The preservative penetrates >=10 mm on the exposed surface or end of the core material of each laminate;

2) When allowing preservatives not to penetrate into the heartwood, it should be satisfied at the same time. In each laminate, the area of the heartwood (S1) is smaller than the area of the end face of the laminate (S1 S2) the depth (L1) does not exceed 50% of the end surface distance (L2), and the width (L3) does not exceed 50% of the distance between the two sides of the end surface (L4) (Figure

6.1 Sampling method and quantity

6.1.1 Appearance quality

According to GB/T 17659.2-2018 regulations.

6.1.2 Water content

Cut two specimens of appropriate size from 10 mm to 50 mm in the length direction of the pressurized anticorrosive glulam.

6.1.3 Physical and mechanical properties

The sampling method and quantity shall be carried out in accordance with 5.6 of GB/T 26899-2011.

6.1.4 Drug loading and penetration

1) For glulam that has been pressurized and preserved before gluing, if the processing volume of each batch of glulam is less than 5 m3, 5 samples should be taken. Each batch of glulam when the processing volume is greater than or equal to 5 m3, 10 samples are taken. One sample is drilled from the side of the plate where the inner layer of each sample is extended.

2) For glulam treated with anticorrosive treatment after gluing, when the batch glulam processing volume is less than 5 m3, 5 samples should be taken. Processing capacity of each batch of glulam when >=5 m3, take 10 samples. Randomly drill a sample from each sample, and drill one test piece from each block.

3) After the sample is drilled, the non-testing wood core of the same tree species, the same treatment level or higher treatment level should be used to fill the hole back to the borehole.

6.2 Inspection

6.2.1 Appearance quality

According to GB/T 17659.2-2018 regulations.

6.2.2 Water content

Carry out in accordance with the provisions of 5.2 in GB/T 26899-2011.

6.2.3 Physical and mechanical properties

According to GB/T 26899-2011 in 5.3, 5.4 regulations.

6.2.4 Drug loading and penetration

The drug loading and penetration of water-borne preservatives in the pressurized preservative treatment of glulam shall be carried out in accordance with the provisions of GB/T 23229-2009, organic solvents the drug loading and penetration of type preservatives in pressurized preservative treated glulam shall be carried out in accordance with GB/T 33021-2016.

7.1 Inspection classification

7.1.1 Factory inspection

The factory inspection items include. appearance quality, moisture content, drug loading and penetration.

7.1.2 Type inspection

Type inspection items include all indicators in this document.

During normal production, the type inspection shall not be less than once every six months; when one of the following situations occurs, the type inspection shall be carried out.

1) When the raw and auxiliary materials and production process undergo major changes;

2) When production has been suspended for more than three months and production is resumed;

3) When the quality supervision department proposes type inspection requirements.

7.2 Judgment rules

7.2.1 Appearance quality

According to GB/T 17659.2-2018 regulations.

7.2.2 Moisture content

In the northern region, the test result is in the range of 8% to 15%; in the southern region, the test result is in the range of 8% to 18%.

7.2.3 Physical and mechanical properties

Determined in accordance with the provisions of GB/T 26899, GB 50005, and GB 50206.

7.2.4 Drug loading and penetration

1) Determined in accordance with the provisions of GB/T 27651.

2) The pass rate of the test results should not be less than 80%.

3) If it is unqualified, it can be re-inspected, but sampling should be doubled, and the pass rate should not be less than 80%.

7.3 Comprehensive judgment

When the raw materials and product quality of the samples are in accordance with the requirements of 5.1 and 5.2 of this document, the batch of products shall be judged to be qualified, otherwise the batch of products shall be judged as unqualified.

8.1 Identification

It should meet the requirements of LY/T 1925.

8.2 Packaging

Products should be packaged separately according to product category and specifications when leaving the factory. It can also be determined based on negotiation between the supplier and the demander.

8.3 Transportation and storage

Products should be stacked flat during transportation and storage to prevent rain and sun exposure.