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GB/T 40441-2021Drainage mats (English PDF)

导排水垫

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 20, 2021

Implementation date

March 1, 2022

Scope

GB/T 40441-2021 is the English-translated version of 导排水垫.

GB/T 40441-2021 covers drainage mats, composite drainage materials made by bonding a filtering geotextile to one or both sides of a high-density polyethylene geonet drain.

It sets the classification and model designation, the requirements, the test methods, the inspection rules, and marking, packaging, storage and transport.

Properties include density, carbon black content, thickness, tensile strength, peel strength and longitudinal hydraulic conductivity, with normative annexes on peel strength and on hydraulic conductivity and its retention after 100 hours.

The standard applies to environmental and municipal works such as landfills, solid waste sites, road and bridge projects, environmental restoration and sponge city projects.

Manufacturers, designers and site engineers use it. It was issued on 20 August 2021 and has applied since 1 March 2022.

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Document preview — GB/T 40441-2021

National Standard of the People's Republic of China

ICS: 83.080
Classification: G 33

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and model
5 Requirements
6 Test method
7 Inspection rules
8 Marking, packaging, storage and transportation
Appendix A (normative) Determination of peel strength
Appendix B (normative) Determination of longitudinal hydraulic conductivity and 100h longitudinal hydraulic conductivity retention

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document specifies the classification and model, requirements, test methods, inspection rules, marking, packaging, transportation and storage of drainage pads.

This document is applicable to environmental protection and municipal services such as landfills, solid waste landfills, road and bridge projects, environmental restoration projects, and sponge cities. project.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 1033.1 Determination of the density of plastic non-foam plastics Part 1: Immersion method, liquid pycnometer method and titration method

GB/T 1033.2 Determination of the density of plastic non-foam plastics Part 2: Density gradient column method

GB/T 2828.1 Sampling inspection procedure by attributes Part 1: Batch inspection sampling plan retrieved by acceptance quality limit (AQL)

GB/T 6673 Determination of the length and width of plastic films and sheets

GB/T 9345.1-2008 Determination of Ash in Plastics Part 1: General Method

GB/T 13021 Determination of carbon black content of polyethylene pipes and fittings by thermal weight loss method

GB/T 13760 Sampling and sample preparation of geosynthetics

GB/T 13761.1 Determination of thickness of geosynthetics under specified pressure Part 1: Method for determination of thickness of single-layer products

GB/T 13762 Geosynthetics, geotextiles and geotextile-related products, test methods per unit area

GB/T 15788 Wide strip tensile test method for geosynthetics

GB/T 16422.2 Plastic laboratory light source exposure test method Part 2: Xenon arc lamp

GB/T 17632 Test method for acid and lye resistance of geotextiles and related products

GB/T 17639 Geosynthetics filament spunbonded needle punched non-woven geotextile

GB/T 19466.6 Plastic Differential Scanning Calorimetry (DSC) Part 6: Oxidation Induction Time (Isothermal OIT) and Oxidation Induction Determination of temperature (dynamic OIT)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Geonet drain

The drainage material is produced from high-density polyethylene as the main raw material and has continuous drainage channels side by side.

3.2 Drainage mat

The drainage and drainage composite material is formed by compounding the geotextile with filtering effect on one or both sides of the drainage net.

3.3 Longitudinal hydraulic conductivity

The volume flow rate per unit time at the rated width and unit hydraulic gradient consistent with the drainage direction.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 13525-2026|GB/T 19860-2026|GB/T 19861-2026|GB/T 34443-2026|GB/T 8807-2026|GB/T 8808-2026

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