IS 13325:2020 Part 2 is the Indian Standard (BIS) for geosynthetics - geotextiles - methods of test for physical properties. This Indian Standard (Part 2) specifies the method for determining the thickness of geotextiles and related products at a specified pressure. It details the testing apparatus, specimen preparation, procedure, and calculation method. This test is a fundamental physical property measurement for quality control and design input.
Specifies methods for determining physical properties of geotextiles such as mass per unit area and thickness.
Overview
- Status
- Current
- Usage level
- Specialized
- Domain
- Geotechnical — Geosynthetics and Ground Improvement
- Type
- Testing Method
Also on InfraLens for IS 13325
Practical Notes
! Ensure the specimen is clamped perfectly along the non-parallel sides of the trapezoid to ensure force is applied correctly.
! The test result is an average of the five highest peaks from the force-elongation curve, not just the single maximum peak.
! This test is critical for applications where the geotextile might be subjected to puncture and subsequent tearing, such as under sharp aggregate.
Frequently referenced clauses
Cl. 3Principle
Cl. 5Apparatus
Cl. 6Preparation and Conditioning of Test Specimens
Cl. 7Test Procedure
Cl. 8Calculation and Expression of Results
Cl. 9Test Report
geotextilegeosyntheticspolymeric materialsnonwovenwoven
International Equivalents
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Key Values6
Quick Reference Values
Test specimen dimensions100 mm x 200 mm
Initial slit length15 mm
Rate of jaw separation (CRE)300 ± 10 mm/min
Pre-tension for specimens ≤ 200 g/m²1 N
Pre-tension for specimens > 200 g/m²2 N
Number of specimens per directionMinimum 5
Key Formulas
Tear Strength (N) = Average of the five highest peak forces recorded during the test for each specimen.
Tables & Referenced Sections
Frequently Asked Questions4
What is the purpose of the trapezoidal tear test?+
To determine the force required to propagate a tear from a pre-cut slit in a geotextile specimen (Clause 3).
What is the specified speed for the tensile testing machine?+
The constant rate of extension (CRE) is 300 ± 10 mm/min (Clause 7.3).
How many specimens are tested?+
A minimum of five specimens in the machine direction and five in the cross-machine direction are required (Clause 6.1).
What are the dimensions of the test specimen?+
The specimen should be a rectangle of 100 mm width and 200 mm length (Clause 6.2).
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.