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GB/T 13942.2-2009: Durability of wood -- Part 2: Method for field test of natural durability
Status: Valid GB/T 13942.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 13942.2-2009 | English | 169 |
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Durability of wood -- Part 2: Method for field test of natural durability
| Valid |
GB/T 13942.2-2009
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| GB/T 13942.2-1992 | English | 239 |
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Method for field test of natural durability of wood
| Obsolete |
GB/T 13942.2-1992
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Basic data | Standard ID | GB/T 13942.2-2009 (GB/T13942.2-2009) | | Description (Translated English) | Durability of wood -- Part 2: Method for field test of natural durability | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B60 | | Classification of International Standard | 79.020 | | Word Count Estimation | 7,724 | | Date of Issue | 2009-02-23 | | Date of Implementation | 2009-08-01 | | Older Standard (superseded by this standard) | GB/T 13942.2-1992 | | Quoted Standard | GB/T 14019 | | Regulation (derived from) | National Standard Approval Announcement 2009 No.3 (Total No.143) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard applies to the determination of anti-microbial properties destroyed or termites wood and natural durability rating level. This section specifies the timber in contact with the soil under field conditions against bio-destructive method for measuring and grading. | GB/T 13942.2-2009: Durability of wood -- Part 2: Method for field test of natural durability---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Durability of wood Part 2. Method for field test of natural durability
ICS 79.020
B60
National Standards of People's Republic of China
Replacing GB/T 13942.2-1992
Wood durability
Part 2. Test methods for natural durability Field
Posted 2009-02-23
2009-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 13942 "Wood Durability" is divided into two parts.
--- Part 1. Laboratory test methods for natural decay;
--- Part 2. Test methods for natural durability field.
This section GB/T 13942 Part 2.
This Part replaces GB/T 13942.2-1992 "natural durability of wood Field test methods of the natural durability of wood."
This section compared with the GB/T 13942.2-1992 The main changes are as follows.
--- Adds a smaller sample size for the underground tests;
--- Grading standards decay and termite ants reference American wood preservative association AWPAE7-07 "Methodofevaluatingwood
preservativesbyfieldtestswithstakes ".
This part by the State Forestry Administration.
This part of the National Standardization Technical Committee centralized timber.
This section is responsible for drafting units. China Forestry Science Institute of Wood Industry.
Participated in the drafting of this section. Tropical Forestry, Chinese Academy of Forestry.
The main drafters of this section. Jiang Mingliang, Shi Zhenhua.
This part of the standard replaces the previous editions are.
--- GB/T 13942.2-1992.
Wood durability
Part 2. Test methods for natural durability Field
1 Scope
GB/T 13942 in this section applies to the determination of antimicrobial exposure conditions in the field of timber damage or termites performance and evaluation
Natural durability rating.
This section provides the timber in contact with the soil under field conditions, antibiotic-destructive measurement and rating methods.
2 Normative references
The following documents contain provisions which, through reference GB/T 13942 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 14019 wood preservative term
3 Terms and Definitions
Terms and definitions GB/T 14019 apply to this part of the established GB/T 13942 of.
4 test site preparation and the sample timber
4.1 Test Site
Select a representative from the venue of tropical, subtropical and warm temperate climate zone. The test area shall indicate the location and climate zone.
To test site is flat, moderate soil moisture, without drought or waterlogging, soil layers thick, rich in humus. If you choose to termite activity
The main venue, six months before the test, as the case may be required to place the right amount of wood termites induce segment to ensure that the venue termite activity and sub
Fabric uniformity.
Site should be selected not applied pesticides, preservative treated wood test site has not been conducted. After selecting the site should be long-term retention, is not the same batch of samples
Should be free to change.
Green plants on the field had no effect on the test may grow up to your decline, if too thick, can be manually removed, should not use chemical herbicides.
Due to local weather records, which recorded monthly averaged air temperature, humidity, rainfall, sunshine.
4.2 Sample Preparation
The test timber shall be marked with the correct species name (Chinese name and Latin name), place of origin and a brief description of the site conditions. And instructions are
Natural forests or plantations. Each sample trees shall be selected on the 3 ~ 5 trunk, height intercepted from the chest up of wooden section, whichever
Heartwood section. Of heartwood and sapwood difficult to distinguish, the pith taken outside the heartwood.
Wood samples should be taken paragraph sawn board sawing, sample size.
a) 25mm × 50mm × 500mm (Figure 1), the sample rectangular cross section, with the long side parallel to the ring;
b) 20mm × 20mm × 300mm [Referring sawing extraction method a)].
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