1、Designation: D6566 12D6566 14Standard Test Method forMeasuring Mass per Unit Area of Turf Reinforcement Mats1This standard is issued under the fixed designation D6566; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of las
2、t revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers an index to the determination of mass per unit area of all turf reinforcement mats.1.2 The values
3、 stated in SI units are to be regarded as standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety
4、 and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD4354 Practice for Sampling of Geosynthetics and Rolled Erosion Control Prod
5、ucts(RECPs) for TestingD4439 Terminology for GeosyntheticsE177 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method2.2 ISO/DIS Document:9864-1990 Mass per Unit Area of Geotextiles33. Ter
6、minology3.1 For definitions of textile terms used in this test method, refer to Terminology D123.3.2 For definitions of terms relating to geotextiles used in this test method, refer to Terminology D4439.4. Summary of Test Method4.1 The mass per unit area of a turf reinforcement mat is determined by
7、weighing test specimens of known dimensions, cut fromequally spaced distances over the full width of the laboratory sample. The calculated values are then averaged to obtain the meanmass per unit area of the laboratory sample.5. Significance and Use5.1 This test method is used to determine if the tu
8、rf reinforcement mat meets specifications for mass per unit area. This testmethod can be used for quality control to determine specimen conformance. This measurement allows for a simple control of thedelivered material by a comparison of the mass per unit area of the delivered material and the speci
9、fied mass per unit area.5.2 The procedure in this test method may be used for acceptance testing of commercial shipments, but caution is advised sinceinformation about between-laboratory precision is incomplete. Comparative tests in accordance with 5.2.1 are advisable.5.2.1 In case of a dispute aris
10、ing from differences in reported test results when using the procedures in this test method foracceptance testing of commercial shipments, the purchaser and the manufacturer should conduct comparative tests to determineif there is a statistical bias between their laboratories. Competent statistical
11、assistance is recommended for the investigation of bias.1 This test method is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosynthetic ErosionControl.Current edition approved July 1, 2012May 1, 2014. Published September 201
12、2June 2014. Originally approved in 2000. Last previous edition approved in 2006as 2012as D6566 00D6566 12.R06. DOI: 10.1520/D6566-12.10.1520/D6566-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Stand
13、ardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available fromAmerican National Standards Institute, 11 W. 42nd St., 13thInstitute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.10036, http:/www.ansi.org.This document is not an ASTM standard and is i
14、ntended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the cu
15、rrent versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1As a minimum, the two parties should take a group of test specimens that are as homogeneous as
16、 possible and which are from alot of material of the type in question. The test specimen should then be randomly assigned in equal numbers to each laboratoryfor testing. The average results from the two laboratories should be compared using the appropriate students t-test and anacceptable probabilit
17、y level chosen by the two parties before testing is begun. If a bias is found, either its cause must be foundand corrected or the purchaser and the manufacturer must agree to interpret future test results in light of the known bias.6. Apparatus6.1 Balance, calibrated, with an accuracy of 0.01 g.7. S
18、ampling7.1 Lot SampleDivide the test specimens into lots, and for the lot to be tested, take the lot sample in accordance with PracticeD4354.7.2 Laboratory SampleConsider the units in the lot sample as the units in the laboratory sample. For the laboratory sample,take a full width swatch of sufficie
19、nt length along the selvage so that the requirements of 7.3 can be met.7.2.1 The laboratory sample should be free from imperfections or other areas not representative of the material sampled.7.3 The number of test specimens shall be a minimum of five, cut such that they are representative of the ent
20、ire roll width andwith a combined total minimum area of 230 000 mm2 (356 in.2). Each test specimen shall be equal in area (not less than 23 000mm2 (35.6 in.2). Cut each test specimen with an accuracy of 60.5 % of its area.NOTE 1For test specimens prepared in the field, larger than minimum-sized test
21、 specimens will be required to stay within the cutting accuracy (0.5 %).Field experience has shown that a test specimen with an area not less than 207 000 mm2 (320.4 in.2) will be necessary to achieve the required accuracy.7.3.1 Cut the test specimens at least one tenth the width of the turf reinfor
22、cement mat from any selvage, unless otherwisespecified.7.3.2 If the structure of the turf reinforcement mat is such that the specified test specimen size is not representative of thelaboratory sample, a larger size shall be agreed upon between the purchaser and the supplier.8. Conditioning8.1 Bring
23、the specimens to moisture equilibrium in the atmosphere for testing turf reinforcement mats, that is a temperature of21 6 2C (70 6 4F) and relative humidity of 60 6 10 %.8.2 Moisture equilibrium is considered to have been reached when the increase in mass of the specimen in successivemeasurements ma
24、de at intervals of not less than 2 h, does not exceed 60.1 % of the mass of the specimen. In general, many turfreinforcement mats contain more moisture when received than they will after reaching moisture equilibrium. However, certainfibers may exhibit slow moisture equilibrium rates from the “as re
25、ceived” wet side. When this is known, a preconditioning cycle,a described in Practice D1776, may be agreed upon between contractual parties.9. Procedure9.1 Test the conditioned test specimens in the standard atmosphere for testing turf reinforcement mats as prescribed in 8.1.9.2 Care should be taken
26、 in handling of the test specimens to avoid altering the natural finished state of the material.9.3 Weigh each of the conditioned specimens separately on a calibrated balance to the nearest 0.01 g.10. Calculation10.1 Calculate the mass per unit area of each of the specimens as follows:m 5Ms31000000/
27、A (1)where:m = mass per unit area rounded to the nearest 0.1 g/m2,Ms = mass of the specimen, g, andA = area of the specimen, mm210.2 Repeat this procedure for each test specimen.10.3 Calculate the average and standard deviation of the mass per unit area results for the test specimens.11. Report11.1
28、Report the following information on mass per unit area of turf reinforcement mats:11.1.1 Type of turf reinforcement mat tested, sampling method used, the test specimen size, shape, and the number of testspecimens tested,11.1.2 The average mass per unit area and standard deviation to three significan
29、t figures, andD6566 14211.1.3 A statement of any departures from the suggested testing procedures so that the results can be evaluated and used.12. Precision and Bias412.1 PrecisionThe precision of this test method is being established.based on an interlaboratory study of D6566 Test Methodfor Measur
30、ing Mass per Unit Area of Turf Reinforcement Mats, conducted in 2013. Eight laboratories participated in this study.Each of the labs reported three replicate test results for two different types of mats. Every “test result” reported represents anindividual determination. Except for the ultimate use
31、of data from only seven laboratories, Practice E691 was followed for thedesign and analysis of the data; the details are given in ASTM Research Report No. RR:D35-1017.12.1.1 Repeatability (r)The difference between repetitive results obtained by the same operator in a given laboratory applyingthe sam
32、e test method with the same apparatus under constant operating conditions on identical test material within short intervalsof time would in the long run, in the normal and correct operation of the test method, exceed the following values only in one casein 20.12.1.1.1 Repeatability can be interprete
33、d as the maximum difference between two results, obtained under repeatabilityconditions, that is accepted as plausible due to random causes under normal and correct operation of the test method.12.1.1.2 Repeatability limits are listed in Table 1.12.1.2 Reproducibility (R)The difference between two s
34、ingle and independent results obtained by different operators applyingthe same test method in different laboratories using different apparatus on identical test material would, in the long run, in thenormal and correct operation of the test method, exceed the following values only in one case in 20.
35、12.1.2.1 Reproducibility can be interpreted as the maximum difference between two results, obtained under reproducibilityconditions, that is accepted as plausible due to random causes under normal and correct operation of the test method.12.1.2.2 Reproducibility limits are listed in Table 1.12.1.3 T
36、he above terms (repeatability limit and reproducibility limit) are used as specified in Practice E177.12.1.4 Any judgment in accordance with statements 12.1.1 and 12.1.2 will have an approximate 95 % probability of beingcorrect. The precision statistics obtained in this ILS must not be treated as ex
37、act mathematical quantities which are applicable toall circumstances and uses. The limited number of materials tested may lead to times when differences greater than predicted bythe ILS results will arise, sometimes with considerably greater or smaller frequency than the 95 % probability limit would
38、 imply.12.2 BiasAt the time of the study, there was no accepted reference material suitable for determining the bias for this testmethod, therefore no statement on bias is being made.12.3 The precision statement was determined through statistical examination of 42 results, from seven laboratories, o
39、n twomaterials.12.4 BiasThe test method has no bias because the value of mass per unit area can only be defined in terms of a test method.Tojudge the equivalency of two test results, it is recommended to choose the mat material closest in characteristics to the test material.4 Supporting data have b
40、een filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:D35-1017. Contact ASTM CustomerService at serviceastm.org.TABLE 1 Mass per Unit Area (gm/m2)Material AverageARepeatabilityStandardDeviationReproducibilityStandardDeviationRepeatabilityLimitReproducibili
41、tyLimitx Sr SR r RDouble Net TRM#1 319.631 95.778 99.262 268.178 277.934Double Net TRM#2 388.713 54.967 54.967 153.907 153.907A The average of the laboratories calculated averages.D6566 14313. Keywords13.1 mass per unit area; turf reinforcement mat; weightASTM International takes no position respect
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