GB/T 40441-2021

Drainage mats (English Version)

Standard No.

GB/T 40441-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 40441-2021

Scope

This document specifies the classification and model requirements for drainage mats, test methods, inspection rules, as well as marking, packaging, transportation and storage. This document is applicable to environmental protection and municipal projects such as landfills, solid waste landfills, road and bridge projects, environmental restoration projects, and sponge cities.

Introduction

Analysis of the core content of the standard

Technical dimension	Two-rib structure (B type)	Three-rib structure (T type)
Longitudinal tensile strength	24-30kN/m	28-35kN/m
Water conductivity retention rate	≥60%(500kPa load)
Composite method	Single/double-sided geotextile	Single/double-sided geotextile

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Detailed explanation of key technical indicators

Key points of longitudinal hydraulic conductivity test

Note when using the hydraulic gradient test device:

1. The sample pretreatment needs to be immersed in (20±2)℃ water for 12h
2. The normal load is divided into three levels of 250/500/1000kPa
3. The hydraulic gradient is fixed at 0.1

Acctual engineering cases show that when the three-rib T2-8-W type product is selected, its hydraulic conductivity under a load of 1000kPa can reach 2.5×10^-4m²/s

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Standard Implementation Recommendations

Selection Decision Matrix

Engineering Scenario	Recommended Model	Key Considerations
Landfill	T2-8-WN	Acid and Alkali Resistance + High Water Conductivity
Sponge City	B1-6	Economic Priority

Special Note: Weather-resistant (W) products must ensure OIT≥20min, and direct ultraviolet rays

should be avoided during construction

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Technology Evolution Analysis

Compared with the 2008 version of the industry standard, this standard has the following major improvements:

• Added 100h long-term performance test requirements
• Specified that the proportion of recycled materials is ≤10%
• Refined weather resistance/acid and alkali resistance classification indicators

GB/T 40441-2021 history

• 2021 GB/T 40441-2021 Drainage mats