BS EN 13257-2016 pdf free download.Geotextiles and geotextile- related products — Characteristics required for use in solid waste disposals
4.3 Characteristics relevant to specific conditions of use
4.3.1 Stiffness at 2 %, 5 % and 10 % Data on stiffness are necessary for the reinforcement function if the deformation of the structure needs to be evaluated.
4.3.2 Tensile strength of seams and joints Data on tensile strength of seams and joints are necessary for all functions if the product is to be mechanically jointed and if load is transferred across the seams and joints.
4.3.3 Static puncture Data on static puncture or – as an alternative – on tensile strength, are necessary for the filtration function if required by the specification, i.e. when the site loading conditions are such that there is a potential risk of static puncture of the filter layer.
4.3.4 Friction characteristics Data on friction characteristics are necessary for the functions separation and filtration when the product is used in a situation where a differential movement can take place between the product and adjacent material that may endanger the stability of the works. The friction characteristics can be measured, using site specific materials, by a direct shear test according to EN ISO 12957-1 or, in the case of loads up to 5 kPa, by an inclined plane test according to EN ISO 12957-2. Friction behaviour with the adjacent construction materials, e.g. the soil or the geosynthetic barrier, should also be considered.
4.3.5 Tensile creep Data on tensile creep can be used to give an indication of the resistance to sustained loading, when the product fulfils a reinforcement function.
4.3.6 Resistance to damage during installation EN ISO 10722 can be used as an index test giving the relative performance of the product. Testing with site specific soil and conditions may give more relevant results for specific design.
4.3.7 Protection efficiency (EN 14574) Data on protection efficiency in accordance with EN 14574 are necessary when there is a risk that the barrier material be punctured by sharp objects or materials. 4.3.8 Water permeability normal to the plane Data on water permeability are necessary when the reinforced structure is subject to water flow.
4.4 Release of dangerous substances National regulations on dangerous substances may require verification and declaration on release, and sometimes content, when construction products covered by this European Standard are placed on those markets. In the absence of European harmonized test methods, verification and declaration on release/content should be done taking into account national provisions in the place of use. NOTE An informative database covering European and national provisions on dangerous substances is available at http://ec.europa.eu/growth/tools-databases/cp-ds/index_en.htm.
5 Assessment and verification of constancy of performance (AVCP)
5.1 General
The compliance of geotextiles and geotextile-related products with the requirements of this European Standard and with the declared values shall be demonstrated by:
— Product type determination (PTD);
— Factory production control (FPC) by the manufacturer, including product assessment.
The manufacturer shall always retain the overall control and shall have the necessary means to take responsibility for the product.
5.2 Presentation of characteristics
The characteristics specified in Table 2, except for durability, shall be expressed as mean values and tolerance value(s) corresponding to the 95 % confidence level. The values expressed may be verified using the procedure referred to in 5.5.
NOTE The 95 % confidence level corresponds to the mean value minus (and/or plus) a tolerance value (see Annex ZA, table ZA1.X column Notes). Both the mean value and the tolerance value are defined by the manufacturer to be representative of the performance of the product for the corresponding characteristic (these two values are not necessarily based on a statistical calculation).
Information on durability shall be expressed in accordance with Annex B.
5.3 Product type determination (PTD)
PTD tests shall be carried out by the manufacturer to define the values of the properties to be declared for the product to satisfy the requirements of this European Standard.
PTD tests shall also be carried out on existing products when a change in the basic materials or manufacturing procedures affects the declared properties or the use of a product. In these cases, the PTD tests are those for the properties which are affected or shall be confirmed and new properties introduced by a change of use.BS EN 13257 pdf download.