ASTM D4759-2011 Standard Practice for Determining the Specification Conformance of Geosynthetics《测定土工人工合成材料的合规性的标准操作规程》.pdf

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1、Designation: D4759 11Standard Practice forDetermining the Specification Conformance ofGeosynthetics1This standard is issued under the fixed designation D4759; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio

2、n. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This practice covers a procedure for determining

3、theconformance of geosynthetic properties to standard specifica-tions.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the

4、 applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D4354 Practice for Sampling of Geosynthetics for TestingD4439 Terminology for GeosyntheticsD4533 Test Method for Trapezoid Tearing Strength ofGeotextilesD7273 Guide for for Acceptance Testing Requiremen

5、ts forGeonets and Geonet Drainage Geocomposites3. Terminology3.1 For general definitions used in this document, refer toTerminology D4439.3.2 Definitions of Terms Specific to This Standard:3.2.1 test result, na value obtained by a given test method,expressed as a single determination or a specified

6、combinationof a number of determinations.4. Significance and Use4.1 This practice provides a means by which the purchasercan determine the conformance of geosynthetic properties asapplied to the acceptance or rejection of a material in regardsto a material specification.4.2 This practice has been de

7、veloped with strong emphasison practicality and the realization that all geosynthetics aresubjected to a vigorous quality control program prior toshipping.NOTE 1It is suggested that the user obtain the mean, standarddeviation, and/or the coefficient of variation for given physical/mechanicalproperti

8、es of a product directly from the manufacturer. If this data isunavailable, it is suggested that users of this practice begin to accumulatedata that can be used to estimate product averages and standard deviationsfor each product.NOTE 2The risk to the purchaser of buying out of specificationmaterial

9、s is minimal when conformance requirements are detailed in thepurchase specification and adequate conformance testing is performed. Itis the producers responsibility to perform thorough quality control testingfor all properties requiring certification. The producers risk of rejection isminimal with

10、the performance of this thorough quality control testing.5. Summary of the Test Procedure5.1 Procedure AThis procedure determines the confor-mance of geosynthetic materials properties to acceptable speci-fications values.NOTE 3Conformance testing is done by the purchaser or designatedperson/organiza

11、tion. It is usually done as the geosynthetics are brought tothe project site and justify the payment of the billing (D4354). Typicallytesting is performed on the final product and no components to produce orassemble the final geosynthetic material need to be conformance tested.5.2 This procedure det

12、ermines the conformance of geo-composite geosynthetic material properties to a set of accept-able specification values. Typically multiple individual com-ponents need to be tested together with the final geocompositeproduct to show conformance with the acceptable materialspecification. Since those i

13、ndividual components might ormight not be altered during production/ assembly, samplecollection is typically executed during production/assembly atthe manufacturing facility.6. Procedure A6.1 Divide into lots and select lot and laboratory samples asdirected in Practice D4354.1This practice is under

14、the jurisdiction of ASTM Committee D35 on Geosyn-thetics and is the direct responsibility of Subcommittee D35.01 on MechanicalProperties.Current edition approved July 1, 2011. Published August 2011. Originallyapproved in 1988. Last previous edition approved in 2007 as D475902(07). DOI:10.1520/D4759-

15、11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO B

16、ox C700, West Conshohocken, PA 19428-2959, United States.6.2 Test the number of specimens as directed in the appli-cable testing method.6.3 If the average test values for the individual lot samplingunit meet all the acceptable specification values, the lot passes.6.4 If the average test value for an

17、y individual lot samplingunit does not meet one or more of the acceptable specificationvalues, the lot shall be resampled and tested, except as noted in6.4.3.6.4.1 Any individual lot sampling unit which fails initialtesting shall not be included in the lot for resampling.6.4.2 Disposition of individ

18、ual lot sampling units which failinitial testing shall be agreed upon by purchaser and seller.6.4.3 If all lot sampling units fail initial testing, reject theentire lot without further sampling and testing.6.4.4 The resample size shall be at least that determined in6.1.NOTE 4The larger the number of

19、 samples in a resample, the smallerwill be the consumers risk of accepting an undesirable product.6.5 Pass the lot if the average test values for the individuallot sampling unit from the resample meet the acceptablespecification values.6.6 Fail the lot if the average test values for any individuallo

20、t sampling unit from the resample do not meet one or moreof the acceptable specification values.6.7 Reject any failing lot.6.8 A numerical example of this practice is included inAppendix X1.7. Procedure B7.1 Divide into lots and select lot and laboratory samples asdirected in Practice D4354.NOTE 5ty

21、pically for geocomposite samples, the specification willrequire sampling during manufacture, select the units for the lot sampleand potentially the multiple individual components at uniformly spacedtime intervals throughout the production period at the production/ assem-bly facility (Procedure C in

22、D4354).7.2 Test the number of specimens as directed in the appli-cable testing methods.7.3 If all the average test values for the individual lotsampling units meet all the acceptable specification values, theentire lot passes.7.4 If the average test value for any individual lot samplingunit does not

23、 meet one or more of the acceptable specificationvalues, that particular lot sampling unit shall be catalogued as“failed” or non-conforming.NOTE 6Most individualASTM standards describe within the standardprocedure as of how to address “failed” or non-conforming measuredvalues.7.4.1 Any individual lo

24、t sampling unit which fails initialtesting shall be retested for all the methods which did not meetthe acceptable specification values.7.4.2 If the average of both tests for any initially non-conforming methods, confirm that the individual lot samplingunit is non-conforming, then the individual lot

25、sampling unitfailing the acceptable specification value need to be rejected.7.4.3 Individual lot sampling units before and after thefailed individual lot sampling unit or units in the lot will beresampled and retested for all applicable testing methods(“blocking tests”).7.4.4 Finally, the sequence o

26、f non-conforming individual lotsampling units in the lot shall be bounded/delineated bypassing individual lot sampling units (“blocking tests”).NOTE 7It should be noted that if any tests on the individualcomponents of the geocomposite are non-conforming, availability of thoseindividual components fo

27、r blocking tests could be limited to the selectedindividual lot sampling units prior to production/assembly.7.4.5 Disposition of individual lot sampling units which failconformance testing shall be agreed upon by purchaser andseller.7.5 Reject the sequence of non-conforming individual lotsampling un

28、its in between the bounding samples in the lot, ifthe average test values for any individual lot sampling unit donot meet one or more of the acceptable specification values.7.6 A numerical example of this procedure is included inAppendix X2.APPENDIXES(Nonmandatory Information)X1. EXAMPLE OF DETERMIN

29、ING CONFORMANCE TO SPECIFICATION IN ACCORDANCE WITH PROCEDURE AX1.1 AssumptionsThis example assumes the following:X1.1.1 A geotextile is to be tested against a specificationthat requires a minimum of trapezoid tear strength of 356 N (80lbf).X1.1.2 For this example, the lot consists of 300 rolls.Prac

30、tice D4354, Procedure C requires two lot sampling unitsper lot for lots of 201 to 500 rolls. The 300 rolls in the lot wereassigned numbers and the five rolls to be used as lot samplingunits were selected using a table of random numbers.X1.1.3 Test Method D4533 specifies there will be onelaboratory s

31、ampling unit taken from each lot sampling unit andrequires the following number of test specimens per laboratorysampling unit in each direction:n 5 tv/A!2where:n = number of test specimens per laboratory sampling unit(rounded upward to the next whole number),D4759 112v = reliable estimate of the coe

32、fficient of variation forindividual observations based on similar materials inthe users laboratory under conditions of single-operator precision,t = the value of Students t for one side limits, a 95 %probability level, and the degrees of freedom associ-ated with the estimate of v, andA = 5.0 % of th

33、e average, the value of the allowablevariation.X1.1.4 Based on a value of v = 6.3 lbf associated with aninfinite number of degrees of freedom ( t = 1.645):n = (1.645) (6.3)/5.02= 4.3 = 5 specimens per laboratorysampling unit in each directionX1.2 Data for Sample Set 1The data are given in TableX1.1.

34、 Lot sampling unit 2 failed in the machine direction.Since lot sampling unit 2 does not meet the specificationrequirement, the lot was resampled.X1.3 ResamplingThe supplier and the purchaser agreedto increase the number of rolls in the second lot sample tothree. The three rolls in the second sample

35、were selected usinga table of random numbers excluding the roll from which lotsampling unit 2 was taken.X1.4 Data for Sample Set 2The data are given in TableX1.2. None of the lots sampling units failed. The lot wasaccepted.TABLE X1.1 Test Results for Sample Set 1SpecimenLot Sampling UnitsMachine Dir

36、ection Cross-Machine Direction12121 847984802 37885 13 827984834 28083 45 83818282Average 82.8 79.4 83.8 82.0D4759 113X2. EXAMPLE OF DETERMINING CONFORMANCE TO SPECIFICATION IN ACCORDANCE WITH PROCEDURE BX2.1 Assumptions This example assumes the following:X2.1.1 A geonet geocomposite is to be tested

37、 against aspecification that requires all the methods as identified inD7273. Specifically the upper and lower geotextile used tomanufacture the geonet geocomposite requires a minimum oftrapezoid tear strength of 356 N (80 lbf) in machine and crossmachine direction.X2.1.2 For this example, the lot co

38、nsists of 175 rolls.Practice D4354, Procedure C requires one lot sampling unitsper lot for lots of 1 to 200 rolls. However, the materialspecification required sampling during manufacture at a fre-quency of every 35 rolls; the units for the lot sample wereselected at uniformly spaced time intervals t

39、hroughout theproduction period. Each individual sample unit consisted of a3 ft by roll width of geonet, upper and lower geotextile andlaminated geonet geocomposite. The 175 geonet geocompositerolls in the lot were assigned sequentiallylabeled numbers andthe six rolls to be used as lot sampling units

40、 were roll numbers1, 35, 70, 105, 140, and 175.X2.1.3 Test Method D4533 specifies there will be onelaboratory sampling unit taken from each lot sampling unit andrequires five test specimens per laboratory sampling unit ineach direction (see X1.1.3).X2.2 Data for Initial Sample SetThe average test da

41、ta aregiven in Table X2.1 per tested Lot Sampling Unit (roll) in eachdirection tested. Lot Sampling Unit 105 failed in the machinedirection.X2.3 RetestingSince lot sampling unit 105 does not meetthe specification requirement, the lot sampling unit 105 wasretested.X2.4 Data for Retesting Lot Sampling

42、 Unit 105The dataare given in Table X2.2. The average test data for lots samplingunits 105 is 66.25 lbf. The individual lot sampling unit 105 wasrejected.X2.5 Bounding Lot Sampling Unit 105 Purchaser andseller check availability of samples. Lot Sampling Unit 100 isavailable with individual component

43、s. No individual compo-nents are available to upper bound Lot Sampling Unit 105,only Lot Unit Sample 140 was available.X2.6 Data for Retesting Lot Sampling Unit 100The dataare given in Table X2.3. That individual lot sampling unit 100was accepted since it was passing the specification require-ment.X

44、2.7 The sequence of non-conforming individual lot sam-pling units in the lot was bounded/delineated by passingindividual lot sampling units (“blocking tests”).X2.8 Reject the sequence of non-conforming individual lotsampling units in the Lot Sampling Unit 101 to 139, sincerepresentative lot unit sam

45、ples do not meet the acceptablespecification values for trapezoidal tear in the machinedirection.TABLE X1.2 Test Results for Sample Set 2SpecimenLot Sampling UnitsMachine Direction Cross-Machine Direction3453451 8692788793802 594808 4813 390828695834 8191848492855 29383839184Average 83.4 92.0 81.4 8

46、5.4 93.0 92.6TABLE X2.1 Test Results for Initial Sample SetLot SamplingUnits (Roll numbers)Machine Direction Cross-Machine Direction1 95.8 105.335 82.2 94.670 80.1 94.1105 65.4 80.4140 80.0 89.3175 85.2 102.6TABLE X2.2 Test Results for Retested SampleLot Sampling Units(Roll numbers)Machine Direction

47、 Cross-MachineDirection105 67.1 82.0TABLE X2.3 Test Results for Bounding Lot Sample UnitLot Sampling Units(Roll numbers)Machine Direction Cross-MachineDirection100 87.9 87.4D4759 114ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item

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