ASTM D5199-12 Standard Test Method for Measuring Nominal Thickness of Geosynthetics

The ASTM D5199-12 standard published by the American Society for Testing and Materials (ASTM) defines a test method for the measurement of the nominal thickness of geosynthetics, except for textured and some structured geomembranes where the entire surface of the presser foot cannot fully contact the geosynthetic surface. This test method does not provide thickness values ​​for geosynthetics under varying normal compressive stresses. This test method is used to determine the nominal thickness, not necessarily the minimum thickness.

For the purposes of this standard,

• The term geomembrane refers to an essentially impermeable membrane used with a foundation, soil, rock or any other geotechnical engineering related material as an integral part of a man-made project, structure or system.
• The term geotextiles refers to a planar product made of polymeric material used in conjunction with soil, rock or other geotechnical engineering related materials as an integral part of a man-made project, structure or system.
• The term geotextiles refers to any permeable textile product used with soil, rock or any other geotechnical material as an integral part of a man-made project, structure or system.
• The expression pressure expresses the force or load per unit area.
• Thickness refers to the distance between a planar surface and its opposite parallel and planar surface, or, in textiles, the distance between the upper and lower surfaces of the material, measured under a certain pressure and time.

While performing the tests, the nominal thickness of the geosynthetics is observed, the vertical distance at which a moving plane is displaced from a parallel surface by the geotextile or geomembrane material for 2 seconds under a certain pressure (20 kPa for geotextiles and 5 kPa for geomembranes).

Thickness is one of the fundamental physical properties used to control the quality of many geosynthetics. Thickness values ​​are required in the calculation of some geotextile and geomembrane parameters such as permeability coefficients and tensile stress.

Our organization also provides standard testing services to measure the nominal thickness of geosynthetics, within the scope of ASTM D5199-12 standard, with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.