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ASTM D4632 Standard Test Method for Grab Breaking Load and Elongation of Geotextiles

ASTM D4632 Standard Test Method for Grab Breaking Load and Elongation of Geotextiles

ASTM D4632 is a grab test used to determine the breaking load (grab strength) and elongation (grab elongation) of geotextile fabrics. This standard is primarily used in quality control and acceptance testing labs comparing geotextiles of similar or identical structure.

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ASTM D4632 is a grab test used to determine the breaking load (grab strength) and elongation (grab elongation) of geotextile fabrics. This standard is primarily used in quality control and acceptance testing labs comparing geotextiles of similar or identical structure. It is not recommended to compare uniquely structured geotextiles or for testing knitted fabrics. It is important to review ASTM D4632/D4632M-15 in order to fully understand the test setup, procedure, and results requirements.
The grab test is a tensile test where the central part of the specimen's width is tested to establish the "effective strength" of the fabric. The effective strength is the strength of the material at a specific width when combined with the additional strength of adjacent material. Test specimens are cut in both the machine direction and cross-machine direction, but are expected to have their results calculated separately. Specimens are cut to 101.6 mm x 203.2 mm (4 in x 8 in), with attention to the direction of the fabric.

The specimen is loaded into the grips leaving a 75 mm (3 in) separation between the jaw faces. ASTM D4632 calls for jaw faces that are at least 25.4 mm x 50.8 mm (1 in x 2 in). However, it allows for each grip to include one jaw face that is larger than the other (a modified grab test), which can be helpful in reducing the effects of specimen/jaw face alignment. The test is conducted at a speed of 300 mm/min (12 in/min) with the required results being load at break and total elongation.

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