ASTM D4759-2002 Standard Practice for Determining the Specification Conformance of Geosynthetics《测定土工合成物规格合格性的标准实施规范》.pdf

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1、Designation: D 4759 02Standard Practice forDetermining the Specification Conformance ofGeosynthetics1This standard is issued under the fixed designation D 4759; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis

2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 determini

3、ng 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

4、the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 4354 Practice for Sampling of Geosynthetics for Testing2D 4439 Terminology for Geosynthetics2D 4533 Test Method for Trapezoid Tearing Strength ofGeotextiles23. Terminology3.1 Definitions:3.1.1 geote

5、xtile, nany permeable textile used with foun-dation soil, rock, earth, or any other geotechnical engineeringrelated material as an integral part of a man-made project,structure, or system.3.1.2 geosynthetic, na planar product manufactured frompolymeric material used with soil, rock, earth, or other

6、geo-technical engineering related material as an integral part of aman-made project, structure, or system.3.1.3 specification, na precise statement of a set ofrequirements to be satisfied by a material, product, system orservice that indicates the procedures for determining whethereach of the requir

7、ements is satisfied.3.1.4 test result, na value obtained by a given test method,expressed as a single determination or a specified combinationof a number of determinations.3.1.5 For definition of terms relating to geotextiles, refer toTerminology D 4439.4. Significance and Use4.1 This practice provi

8、des 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 developed with strong emphasison practicality and the realization that all geosynthetics

9、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/mechanicalproperties of a product directly from the manufacturer. If this data isunavailable, it is sugge

10、sted 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 specificationmaterials is minimal when conformance requirements are detailed in thepurchase specification an

11、d 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 the performance of this thorough quality control testing.5. Procedure5.1 Divide into lo

12、ts and select lot and laboratory samples asdirected in Practice D 4354.5.2 Test the number of specimens as directed in the appli-cable testing method.5.3 If the average test values for the individual lot samplingunit meet all the acceptable specification values, the lot passes.5.4 If the average tes

13、t value for any individual lot samplingunit does not meet one or more of the acceptable specificationvalues, the lot shall be resampled and tested, except as noted in5.4.3.1This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-thetics and is the direct responsibility of Subcommitte

14、e D35.01 on MechanicalProperties.Current edition approved Oct. 10, 2002. Published November 2002. Originallypublished as D 475988. Last previous edition D 475988(1996).2Annual Book of ASTM Standards, Vol 04.13.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1

15、9428-2959, United States.5.4.1 Any individual lot sampling unit which fails initialtesting shall not be included in the lot for resampling.5.4.2 Disposition of individual lot sampling units which failinitial testing shall be agreed upon by purchaser and seller.5.4.3 If all lot sampling units fail in

16、itial testing, reject theentire lot without further sampling and testing.5.4.4 The resample size shall be at least that determined in5.1.NOTE 3The larger the number of samples in a resample, the smallerwill be the consumers risk of accepting an undesirable product.5.5 Pass the lot if the average tes

17、t values for the individuallot sampling unit from the resample meet the acceptablespecification values.5.6 Fail the lot if the average test values for any individuallot sampling unit from the resample do not meet one or moreof the acceptable specification values.5.7 Reject any failing lot.5.8 A nume

18、rical example of this practice is included inAppendix X1.APPENDIX(Nonmandatory Information)X1. EXAMPLE OF DETERMINING CONFORMANCE TO SPECIFICATIONX1.1 AssumptionsThis example assumes the following:X1.1.1 A geotextile is to be tested against a specificationthat requires a minimum of trapezoid tear st

19、rength of 356 N (80lbf).X1.1.2 For this example, the lot consists of 300 rolls.Practice D 4354, 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 tabl

20、e of random numbers.X1.1.3 Test Method D 4533 specifies there will be onelaboratory sampling 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 un

21、it(rounded upward to the next whole number),v = reliable estimate of the coefficient 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 t

22、he degrees of freedom associ-ated with the estimate of v, andA = 5.0 % of the 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

23、 in each directionX1.2 Data for Sample Set 1The data are given in TableX1.1. 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 r

24、olls in the second lot sample tothree. The three rolls in the second sample 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.T

25、ABLE X1.1 Test Results for Sample Set 1SpecimenLot Sampling UnitsMachine Direction Cross-Machine Direction12121 847984802 37885 13 827984834 28083 45 83818282Average 82.8 79.4 83.8 82.0D4759022ASTM International takes no position respecting the validity of any patent rights asserted in connection wi

26、th any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible tech

27、nical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful considerat

28、ion at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Ha

29、rbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE X1.2 Test Results for Sample Set 2SpecimenLot Sampling UnitsMachine Direction Cross-Machine Direction2452451 8692788793802 594808 4813 390828695834 8191848492855 29383839184Average 83.4 92.0 81.4 85.4 93.0 92.6D4759023