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MASS PER UNIT AREA
Test performed according to EN ISO 9864.
A minimum of 10 test specimens of precisely known area (not less than 100 cm 2) are cut out of the laboratory sample. Each specimen is conditioned and weighed until constant mass. An average mass per unit area of sample is reported as test result.
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MASS PER UNIT AREA OF A GEOSYNTHETIC CLAY BARRIER
Test performed according to EN 14196
A minimum of 5 square specimens (not smaller than 200x200 mm) are cut out using a hydraulic punch press. Each specimen is weighed and an average mass/unit area is recorded. The mass of geotextile components (as declared by manufacturer) is deducted from the average mass. The water content and mass/unit are of clay component is also measured. Average mass/unit area, average mass of bentonite at as received and 0% moisture content are reported.
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THICKNESS UNDER LOAD
Test performed according to EN 9863-1.
A minimum of 10 specimens (not smaller than 100x100 mm) are cut out of the laboratory sample. A presser foot is gently lowered onto geosynthetic specimen applying a 2 ± 0,01 kPa pressure. After 30 s the thickness sample is recorded using dial gauge. Without removing the sample the load is increased to 20 ± 0,01 kPa and 200 ± 0,01 kPa and sample thickness’ are recorded. The procedure is repeated on each product specimen. Average thickness’ under 2 , 20 and kPa are reported together with standard deviations.
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SWELL INDEX OF CLAY MINERAL COMPONENT OF GCL
Test performed according to ASTM D5890
The clay is ground to less than 0,15 mm (sieve #100), 65% passing passing through 0,074 mm (sieve #200) and dried until constant mass. A specimen of dry clay weighing 2,00 ± 0,01 g is split into 0,1 g portions. A clean, 100-ml graduated cylinder is filled with distilled water and 0,1 g portions of clay are poured to the cylinder every 10 minutes. After 16 hours the volume of swollen bentonite is read at the bottom of cylinder and reported.
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CHARACTERISTIC OPENING SIZE
Test performed according to EN ISO 12956.
A minimum of 5 specimens are cut and submerged in water with surfactant for a period of 12 h. Wet specimen is placed in a shaker and covered with selected granular material. Water is sprayed on the specimen that is shaken for 600 s. Specimen is dried to constant mass together with retained granular material. procedure is peated on at least 3 specimens. Granular material passing through all tested specimens is combined, dried to constant mass and tested for grain-size distribution. The effective particle size corresponding to 90% of particles is the result of the test.
