IS 15382:2020 Part 1 is the Indian Standard (BIS) for geosynthetics - geomembranes - general characteristics and methods of test. This standard specifies the laboratory test methods for determining the general characteristics and mechanical properties of geomembranes used in buried civil engineering applications. It provides detailed procedures for crucial tests like thickness, mass per unit area, wide-width tensile strength, tear resistance, and puncture resistance.
Specifies general characteristics, terminology, sampling and methods of test for geomembranes.
Overview
- Status
- Current
- Usage level
- Frequently Used
- Domain
- Geotechnical — Geosynthetics and Ground Improvement
- Type
- Testing Method
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Practical Notes
! Ensure proper sampling from rolls as per the standard's guidelines to get representative results for quality assurance.
! Specimen conditioning (temperature and humidity) before testing is critical for these polymer-based materials and significantly affects test outcomes.
! The wide-width tensile test (Annex B) is more representative of in-situ stress-strain behavior than narrow strip tests commonly used for plastics.
Frequently referenced clauses
geomembranegeosyntheticsHDPELLDPEpolymerscontainment liner
International Equivalents
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Key Values6
Quick Reference Values
Pressure for thickness measurement2 ± 0.01 kPa
Presser foot area for thickness measurement25 cm²
Specimen width for wide-width tensile test200 mm
Gage length for wide-width tensile test100 mm
Rate of extension for tensile test10 mm/min
Diameter of plunger for static puncture test50 mm
Key Formulas
Tensile Strength (kN/m) = F / Ws (where F is max force, Ws is specimen width)
Nominal Thickness (mm) = Average of 10 measurements taken across the roll width
Tables & Referenced Sections
Key Tables
Table 1 - General Characteristics of Geomembranes
Table 2 - Test Methods for Characteristics of Geomembranes
Key Clauses
Clause 4 - Characteristics of Geomembranes
Annex A - Method for Determination of Thickness
Annex B - Method for Determination of Tensile Properties (Wide Width Tensile Test)
Annex C - Method for Determination of Tear Resistance
Annex D - Method for Determination of Static Puncture Resistance (CBR Test)
Frequently Asked Questions4
What is the specified pressure for measuring geomembrane thickness?+
2 ± 0.01 kPa over a 25 cm² presser foot area, as per Annex A, to avoid compressing the material during measurement.
What is the purpose of the wide-width tensile test?+
It determines the tensile strength and elongation of a 200 mm wide geomembrane specimen (Annex B), better simulating field stress conditions and minimizing the 'necking' effect seen in narrow specimens.
Does this code provide minimum acceptable property values for a project?+
No, this standard only provides the standardized methods of testing. The project-specific design specifications will state the minimum required values based on design needs.
How is puncture resistance measured according to this standard?+
Using the static puncture test (CBR test) as detailed in Annex D, which measures the force required for a 50 mm diameter plunger to penetrate the geomembrane.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.