APPENDIX C 

 GEOTEXTILE FILTER TESTS 



1. Tensile Strength and Elongation Test 



Test five Stronger Principal Direction (SPD) and five Weaker Principal 

 Direction (WPD) samples, unaged, in accordance with ASTM Standard D 1682-64 

 Breaking Load and Elongation of Textile Fabric-Grab Test Method. The jaws 

 shall be 2.54 centimeters (1 inch) square and the constant rate of travel 

 30.5 centimeters (12 inches), per minute. Care should be exercised to make 

 sure the fabric is properly alined to the jaws. If not properly alined, 

 the results will be inaccurate. Test should be conducted at 22.8° ±2° 

 Celsius (73° ±3° Fahrenheit) . 



2. Seam Breaking Strength 



Test five unaged samples in accordance with method ASTM Standard D 

 1683-68, using 2.54-centimeter square jaws and 30.5 centimeters per minute 

 constant rate of travel. 



3. Puncture Strength 



Test five unaged samples using Standard ASTM D 751-73 and determine the 

 puncture strength using the Tension Testing Machine With Ring Clamp, except 

 that the steel ball should be replaced with a 5/16-inch diameter, solid 

 steel cylinder centered within the ring clamp. 



4. Burst Strength 



Test five unaged samples in accordance with ASTM Standard D 751-73 and 

 determine the bursting strength using the Diaphragm Test Method. 



5. Abrasion Resistance 



Test five SPD and five WPD unaged samples in accordance with ASTM 

 Standard D 3884-80 (formerly D 1175-71) using the "Rotary Platform, Double 

 Head" method. The abrasive wheels must be the rubber-base type equal to 

 the CS-17 "Calibrase" manufactured by Taber Instrument Company. The load 

 on each wheel must be 1 000 grams and the test must be continued for 1 000 

 revolutions. After abrasion determine the residual tensile strength by 

 the 1-inch Ravelled Strip Method of ASTM D1682-64. 



6. Freeze-Thaw Test 



Subject five SPD and five WPD samples, 10.2 ±0.51 by 15.2 ±0.51 centi- 

 meters (4 ±0.2 by 6 ±0.2 inches), unaged, to 300 freeze- thaw cycles as des- 

 cribed in test method CRD-C 20. Each cycle should be a duration of 2 hours 

 ±4 minutes duration. Then test samples using ASTM Standard D 1682 Grab Test 

 Method as described in 1. above. 



7. High Temperature Test 



Place five SPD and five WPD samples, 10-2 ±0.51 by 15.2 ±0.51 centimeters, 

 unaged, in a forced draft oven at 82.2° ±2° Celsius (180° ±3° Fahrenheit) for 

 48 ±2 hours. Then test each sample at the test temperature using ASTM 

 Standard D 1682 Grab Test Method as described in 1. above. 



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