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ASTM D6637 PDF

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D / DM Standard Test Method for Determining Tensile Properties of Geogrids by the Standard + Redline PDF Bundle, 12, $, ADD TO CART. Determining Tensile Properties of Geogrids by the Single or Multi-Rib Tensile Method1. 1 This test method is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D on Mechanical Properties. 2 Annual Book of ASTM. ASTM D Standard Test Method for Determining Tensile Properties of Geogrids by W/D S/S BY ASTM D/DM. Format. Details. Price (USD). PDF.


Astm D6637 Pdf

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View Account▹ · Home; ASTM D/DM Add to Cart. Printed Edition + PDF;; Immediate download; $; Add to Cart. D Test Method for Determining Tensile Properties of Geogrids by the Single or. Multi-Rib Examples of these test methods are ASTM D and D This ASTM D test method is intended for quality control and conformance testing of geogrids. The determination of the ASTM D tensile.

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Additional Comments: Price USD. Single User. In Stock. Need it fast? Ask for rush delivery. Most backordered items can be rushed in from the publisher in as little as 24 hours. If a bias is found, either its cause must be found and corrected or the purchaser and supplier must agree to interpret future test results in light of the known bias.

ASTM D6637/D6637M-15

Some modication of techniques may be necessary for a given geogrid depending upon its physical make-up. Special adaptations may be necessary with strong geogrids, multiple layered geogrids, or geogrids that tend to slip in the clamps or those which tend to be damaged by the clamps. Apparatus 6. For a given product, the same clamps shall be used in testing methods A, B, and C prior to making any comparison between results.

The machine shall be equipped with a device for recording the tensile force and the amount of separation of the grips. Both of these measuring systems shall be accurate to 6 1. The rate of separation shall be uniform and capable of adjustment within the range of the test.

Examples of extensometers include mechanical, optical, infrared or electrical devices. Sampling 7. The sample may be taken from the end portion of a roll provided there is no evidence it is distorted or different from other portions of the roll.

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Test Specimen 8. All specimens should be free of surface defects, etc. Take no specimens nearer the selvage edge along the geogrid than the width of the sample. NOTE 1If a comparison of one geogrid to another is to be made the length of each specimen shall be the same as similar as possibly and agreed upon by all parties. Instead, specify the xed number of 5 specimens for the required direction.

This value for v is somewhat larger than usually found in practice. When a reliable estimate of v for the users laboratory becomes available, Eq 1 will usually require fewer than the xed number of specimens. Conditioning 9. Consider the specimen to be at moisture equilibrium when the change in mass of the specimen in successive weighings made at intervals of not less than 2 h does not exceed 0.

Consider the specimen to be at temperature equilibrium after 1 h of exposure to the atmosphere for testing geosynthetics. The time of immersion must be sufficient to wet-out the specimens thoroughly, as indicated by no signicant change in strength or elongation following a longer period of immersion, and at least 2 min. To obtain thorough wetting, it may be necessary or advisable to use distilled water. Geogrids which exhibit curl memory should be laid at and weighted, until the geogrid remains at without weight.

Procedure At least one clamp should be supported by a free swivel or universal joint which will allow the clamp to rotate in the plane of the geogrid. This must be repeated for each layer of geogrid included in the test. For those cases where the outermost ribs are severed, the test results shall be based on the unit of width associated with the number of intact ribs. NOTE 2In some applications, it may be necessary to perform tensile tests in both the machine and the cross-machine directions.

In all cases, the direction of the tensile test specimen s should be clearly noted. D 0. If any of the modications listed above are used, state the method of modication in the report.

Measure the elongation to three signicant gures. It can also be obtained independently of the cross head movement. These measurements can be made with extensometers or area measuring devices which are set to read the center portion of the specimen and containing at least one transverse rib.

When used, the minimum extensometer gage length shall be 60 mm. Calculation The average elongation at failure shall be determined separately for machine direction specimens and cross-machine direction specimens and expressed as the percentage increase in length, based upon the initial gage length of the specimen. Report this as the elongation at failure. For each test, the tensile load-displacement curve Fig.

The displacement where this occurs will be designated as the slack displacement, do. The applied tension at the slack displacement will be designated as the slack tension, To.

Both values must be recorded in the report.

The slack tension may only be applied once. The time between application of slack tension and test initiation must be less than two minutes. Measure the distance between clamp faces or centerline to centerline of the roller grips to determine test specimen gage length External extensometers or other external means of measurement for example, photo methods are encouraged for all tests where modulus is to be measured, and must be used to determine displacement when roller clamps are used in testing.

Documentation should be provided if a discrepancy arises when extensometers are not used during testing. NOTE 3Some modications of clamping techniques may be necessary for a given geogrid depending upon its construction. Special clamping congurations may be necessary for geogrids constructed of coated bers or yarns to prevent them from slipping in the clamps or being damaged as a result of being gripped too tightly in the clamps.

Consider the specimen to be at temperature equilibrium after 1 h of exposure to the atmosphere for testing geosynthetics. The time of immersion must be sufficient to wet-out the specimens thoroughly, as indicated by no signicant change in strength or elongation following a longer period of immersion, and at least 2 min.

To obtain thorough wetting, it may be necessary or advisable to use distilled water. Geogrids which exhibit curl memory should be laid at and weighted, until the geogrid remains at without weight.

Procedure At least one clamp should be supported by a free swivel or universal joint which will allow the clamp to rotate in the plane of the geogrid. This must be repeated for each layer of geogrid included in the test.

Astm d6637

For those cases where the outermost ribs are severed, the test results shall be based on the unit of width associated with the number of intact ribs. NOTE 2In some applications, it may be necessary to perform tensile tests in both the machine and the cross-machine directions.

In all cases, the direction of the tensile test specimen s should be clearly noted. D 0. If any of the modications listed above are used, state the method of modication in the report. Measure the elongation to three signicant gures. It can also be obtained independently of the cross head movement.

ASTM D6637 Single or Multi-Rib Tensile Test of Geogrids

These measurements can be made with extensometers or area measuring devices which are set to read the center portion of the specimen and containing at least one transverse rib.

When used, the minimum extensometer gage length shall be 60 mm. Calculation The average elongation at failure shall be determined separately for machine direction specimens and cross-machine direction specimens and expressed as the percentage increase in length, based upon the initial gage length of the specimen.

Report this as the elongation at failure. For each test, the tensile load-displacement curve Fig.

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The displacement where this occurs will be designated as the slack displacement, do. The applied tension at the slack displacement will be designated as the slack tension, To.

Both values must be recorded in the report. The slack tension may only be applied once. The time between application of slack tension and test initiation must be less than two minutes.

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Measure the distance between clamp faces or centerline to centerline of the roller grips to determine test specimen gage length External extensometers or other external means of measurement for example, photo methods are encouraged for all tests where modulus is to be measured, and must be used to determine displacement when roller clamps are used in testing.

Documentation should be provided if a discrepancy arises when extensometers are not used during testing. NOTE 3Some modications of clamping techniques may be necessary for a given geogrid depending upon its construction.

Special clamping congurations may be necessary for geogrids constructed of coated bers or yarns to prevent them from slipping in the clamps or being damaged as a result of being gripped too tightly in the clamps.

When roller clamps are used an external extensometer, per Fig. In this case, the distance between the moving feet of the extensometer will determine the gage length for use in elongation calculations and not test speed. NOTE 4Care shall be taken while testing multiple geogrid layers to assure even tensioning of the layers and uniform clamping pressure. The test result shall be discarded if the result is a load at a small displacement or peak strength is reached without having all of the layers evenly tensioned.

Report the maximum force obtained to cause failure, the time to failure and the elongation at the measured maximum force. No other break shall be discarded unless the test is known to be faulty.Consider the specimen to be at temperature equilibrium after 1 h of exposure to the atmosphere for testing geosynthetics.

At least one clamp should be supported by a free swivel or universal joint which will allow the clamp to rotate in the plane of the geogrid. The inch-pound values stated in parentheses are provided for information only. Likewise, label a second point, P1, at a specied elongation, e1, taken at do. Signicance and Use 5. AWS D1.

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