ASTM D7004-03(R2021) pdf free download

ASTM D7004-03(R2021) pdf free download.Standard Test Method for Grab Tensile Properties of Reinforced Geomembranes
1. Scope
1.1 This test method is used to measure the grab tensile properties of reinforced geomembranes. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 Definitions of terms applying to this test method appear in Terminology D4439. 3.1.2 atmosphere for testing geosynthetics, n—air main- tained at a relative humidity between 50 to 70 % and a temperature of 21 6 2 °C [70 6 4 °F]. 3.1.3 reinforced geomembrane, n—a geomembrane inter- nally reinforced with a textile. 3.1.4 yarn, n—a generic term for a continuous strand of textile fibers, filaments, or material in a form suitable for knitting, weaving, or otherwise intertwining to form a textile fabric.
4. Significance and Use
4.1 This test method evaluates grab tensile properties of reinforced geomembranes for the purposes of quality control, quality assurance, and research. In order to evaluate the full contribution of the reinforcement, testing is performed parallel to the directions of reinforcement. This test method is an index test and is not intended for design purposes.
5. Apparatus
5.1 Tensile Testing Machine—Constant rate of extension (CRE) equipment meeting the requirements of Specification D76/D76M. The load cell shall be accurate to within 61 % of the applied force. The drive mechanism shall be able to control the rate of extension to within 61 % of the targeted rate. 5.2 Grips—One of the grips must be self-aligning to com- pensate for uneven distribution of force across the specimen. The clamping force and the clamp surfaces shall hold the specimen firmly without causing damage. The clamps shall be capable ofgripping a 25 mm [1 in.] by 25 mm [1 in.] area. This can be accomplished by either using 25 mm [1 in.] square clamp faces or by using clamps with dimensions of 25 mm [1 in.] by greater than 25 mm [1 in.] and crossing the clamps in the grips so that only a 25 mm [1 in.] by 25 mm [1 in.] area is gripped. 5.3 Recording Mechanism—The testing machine shall be equipped with equipment capable of producing a hard copy of the force versus displacement curve. Electronic data acquisi- tion with printer capabilities or direct recording devices are acceptable.
6. Sampling, Test Specimens, and Test Units
6.1 Lot Sample—For the lot sample, take rolls of geomem- brane per the applicable project specification, or as agreed upon between purchaser and supplier. Unless otherwise specified, refer to Practice D4354. 6.2 Laboratory Sample—For the laboratory sample, take a full-width swatch approximately 1 m [3 ft] long by roll width for each roll in the lot sample. Take a sample that will exclude material from the outer wrap of the roll or the inner wrap around the core. In the case where the sample is taken at the production site, material from the outer wrap may be used if it is undamaged. 6.3 Test Specimens—Prepare five specimens with the length ofthe specimen parallel to the machine direction (MD) and five specimens with the length parallel to the transverse direction (TD) for materials with the reinforcement running in those directions. Ifthe reinforcement is aligned in any direction other than the machine or transverse direction, specimens shall be cut parallel to those directions and so noted in the report. Cut the specimens such that different reinforcing yarns or strands are tested in each specimen. Specimens may be taken from the selvage as long as there are not more yarns in the selvage than in the rest of the product. 6.4 The specimens shall be 100 mm [4 in.] wide by at least 150 mm [6 in.] long (test direction). Test specimens shall be cut parallel to the direction of reinforcement being tested.