BS EN ISO 12958 is an International Standard which specifies a method for determining the constant-head water flow capacity within the plane of a geotextile or geotextile-related product.
If the full water flow capacity characteristics of the geotextile or geotextile-related product have previously been established, then for control purposes it can be sufficient to determine the water flow capacity at two loads and both gradients.
The compressibility of the product over time will substantially influence the in-plane water flow capacity. Test methods for assessing the compressive creep behaviour of geotextiles or geotextile-related products are described in ISO 25619-1.
The test report is judged in conjunction with the long-term compressive creep behaviour in order to assess the long-term flow capacity.
Contents of BS EN ISO 12958:
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and materials
6 Specimens
6.1 Handling
6.2 Selection
6.3 Number and dimensions
6.4 Specimen condition
7 Test procedure
8 Calculations and expression of results
9 Test report
Annex A (informative) Determination of the correction factor RT for conversion to a water temperature of 20 °C
Annex B (informative) Experimental data and calculations for a specimen
Bibliography
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BS EN ISO 12956 is an International Standard which specifies a method for the determination of the characteristic size of the openings of a single layer of a geotextile or geotextile-related product using the wet-sieving principle.
Contents of BS EN ISO 12956:
Foreword
1 Scope
2 Normative references
3 Symbols
4 Principle
5 Apparatus and materials
6 Test specimens
6.1 Handling
6.2 Selection
6.3 Number and dimensions
6.4 Specimen condition
7 Procedure
8 Calculation and expression of results
9 Test report
Annex A (normative) Mesh sizes
Annex B (informative) Example of the determination of the characteristic opening size
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BS EN ISO 11058:2010 Geotextiles and geotextile-related products. Determination of water permeability characteristics normal to the plane, without load
BS EN ISO 11058 specifies two test methods for determining the water permeability characteristics of a single layer of geotextile or geotextile-related product normal to the plane:
a) The constant head method;
b) The falling head method.
If the full permeability characteristics of the geotextile or geotextile-related product have previously been established, then for control purposes it can be sufficient to determine the velocity index at a head loss of 50 mm only.
Contents of BS EN ISO 11058:
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Test specimens
4.1 Handling
4.2 Selection
4.3 Number and dimensions
4.4 Condition of specimens
5 Constant head method
5.1 Principle
5.2 Apparatus
5.3 Procedure
5.4 Calculation and expression of results
6 Falling head method
6.1 Principle
6.2 Apparatus
6.3 Procedure
6.4 Calculation and expression of results
7 Test report
Annex A (informative) Determination of the correction factor, RT, to a water temperature of 20 °C
Annex B (informative) Relationship between head loss and flow velocity
Annex C (informative) Velocity index
Annex D (informative) Experimental data and calculations
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Geosynthetic barriers, Geosynthetic materials, Clay, Construction materials, Impermeable materials, Permeability measurement, Gases, Gas flow, Flow measurement, Leak tests, Test equipment
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BS EN ISO 10722:2007 Geosynthetics. Index test procedure for the evaluation of mechanical damage under repeated loading. Damage caused by granular material
BS EN ISO 10722 describes an index test procedure for simulating mechanical damage to geosynthetics, caused by granular material, under repeated loading. The damage is assessed visually and by the loss of tensile strength.
Other reference tests may be used to assess the damage caused by this test. The test method described is an index test procedure, using a standard granular material.
Contents of BS EN ISO 10722:
Foreword
Scope
Normative references
Definitions
Principle
Test specimens
Sampling
Number and dimensions of test specimens
Conditioning
Apparatus
Procedure
Damage procedure
Measurement of damage
Calculations
Test report
Bibliography
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Geosynthetic materials, Geotextiles, Tensile testing, Joints, Seams, Width, Textile testing, Tensile strength, Glass fibres, Test specimens, Stability, Test equipment, Atmosphere, Testing conditions, Strength of materials
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