1、Designation: D 6525 00 (Reapproved 2006)Standard Test Method forMeasuring Nominal Thickness of Permanent Rolled ErosionControl Products1This standard is issued under the fixed designation D 6525; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the measurement of the nominalthickness of permanent rolled erosion
3、control products.1.2 This test method does not provide thickness values forpermanent rolled erosion control products under variablecompressive stresses. This test method determines nominalthickness, not necessarily minimum thickness.1.3 The values stated in SI units are to be regarded as thestandard
4、. The values given in parentheses are for informationonly.1.4 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 applica-bil
5、ity of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 4354 Practice for Sampling of Geosynthetics for TestingD 5199 Test Method for Measuring the Nominal Thicknessof Geosynthetics3. Terminology3.1 Definitions:3.1.1 pressure, nthe force or load per unit area.3.1.2 th
6、ickness(1) the distance between one planar sur-face and its opposite parallel and planar surface; (2) inpermanent rolled erosion control products, the distance be-tween the upper and lower surfaces of the material, measuredunder a specified pressure and time.4. Summary of Test Method4.1 The nominal
7、thickness of permanent rolled erosioncontrol products is determined by observing the perpendiculardistance that a movable plane is displaced from a parallelsurface by the permanent rolled erosion control product whileunder a specified pressure of 0.2 kPa (0.029 psi) for 5 s.5. Significance and Use5.
8、1 Thickness is one of the basic physical properties used tocontrol the quality of permanent rolled erosion control prod-ucts. Thickness values may aid in the calculation of otherpermanent rolled erosion control product parameters. Thick-ness however is not generally an indication of field perfor-man
9、ce and generally should not be used in specifications. Thistest method is developed to aid manufacturers, designers, andend users in comparing the thickness of permanent rollederosion control products through the use of an accepted ASTMstandard.5.2 The thickness of permanent rolled erosion control p
10、rod-ucts may vary considerably depending on the pressure appliedto the specimen during measurement. Where observed changesoccur, thickness decreases when applied pressure is increased.To minimize variation, specific sample size and applied pres-sure are indicated in this test method to ensure all re
11、sults arecomparable.5.3 This test method may be used for acceptance testing ofcommercial shipments of permanent rolled erosion controlproducts, but caution is advised since information on between-laboratory precision is incomplete. Comparative tests in accor-dance with 5.3.1 may be advised.5.3.1 In
12、case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commercial shipments, the purchaser and the sup-plier should conduct comparative tests to determine if there isa statistical bias between their laboratories. Competent statis-tical
13、 assistance is recommended for the investigation of bias.As a minimum, the two parties should take a group of testspecimens that are as homogeneous as possible and that areformed from a lot of material of the type in question. The testspecimens should be randomly assigned in equal numbers toeach lab
14、oratory for testing. The average results from the twolaboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before the testing is begun. If bias is found, either1This test method is under the jurisdiction of ASTM Committee
15、D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-thetic Erosion Control.Current edition approved June 1, 2006. Published June 2006. Originallyapproved in 2000. Last previous edition approved in 2000 as D 6525 00.2For referenced ASTM standards, visit the ASTM webs
16、ite, 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 Box C700, West Conshohocken, PA 19428-2959, United Stat
17、es.its cause must be found and corrected or the purchaser andsupplier must agree to interpret future tests in light of theknown bias.NOTE 1The user should be aware that the compressibility of thematerials, their rebound characteristics, and the like will also affect thethickness of the permanent rol
18、led erosion control products following thetime they are rolled up on rolls, shipped, and stored.6. Apparatus6.1 Thickness Testing InstrumentThe thickness gaugeshall have a base (or anvil) and a free-moving presser foot platewhose planar faces are parallel to each other to 0.1 mm. Agauge with a 150-m
19、m (6-in.) diameter presser foot, the baseshall extend at least 10 mm in all directions further than theedge of the approximately 17 500-mm2circular presser foot,shall be used for measurements of permanent rolled erosioncontrol products. The instruments must be capable of measur-ing a maximum thickne
20、ss of at least 25 mm (1 in.) to anaccuracy of 60.2 mm. The gauges shall be constructed topermit gradual application of pressure to a specific force of 0.26 0.02 kPa (0.029 6 0.003 psi) for permanent rolled erosioncontrol products. Dead weight loading may be used.6.2 Cutting DiesDies to cut specimens
21、 should have di-mensions at least as large as a circle 200 mm (8 in.) indiameter.NOTE 2Due to compressibility of many permanent rolled erosioncontrol products, the cutting and handling preparation may change thethickness. Care should be exercised to minimize these effects.7. Sampling7.1 Lot SampleIn
22、 the absence of other guidelines, dividethe product into lots and take lot samples in accordance withPractice D 4354.7.2 Laboratory SampleConsider the units in the lotsample as the units in the laboratory sample. For the laboratorysample, take a full-width sample of sufficient length along thecenter
23、 section of the rolls. Exclude the inner and outer layers orwraps of the roll or any material containing folds, crushedareas, or other distortions not representative of the sampled lot.7.3 Remove test specimens from the laboratory sample in arandomly distributed pattern across the width with no spec
24、imentaken nearer than 100 mm (4 in.) from the roll sides or ends,unless otherwise specified.7.4 Test SpecimensFrom each unit in the laboratorysample, remove the specimens so that the edge of the specimenwill extend beyond the edge of the presser foot by 10 mm (0.39in.) in all directions (that is at
25、least a circle of 200 mm (8 in.)in diameter).7.5 Number of SpecimensUnless otherwise agreed upon,as when provided in an applicable material specification, takea number of test specimens per laboratory sample such that theuser may expect at the 95 % probability level that the test resultis not more t
26、han 6.0 % of the average above or below theaverage of the sample. Determine the number of specimens persample as follows:7.5.1 Reliable Estimate of vWhen there is a reliableestimate of v based upon extensive part records for similarmaterials tested in the users laboratory as directed in this testmet
27、hod, calculate the required number of specimens as fol-lows:n 5 tv/A!2(1)where:n = number of test specimens (rounded upward to a wholenumber),v = reliable estimate of the coefficient of variation ofindividual observations on similar materials in theusers laboratory under conditions of single operati
28、onprecision, %,t = value of Students t for one-sided limits (see Table 1 ofTest Method D 5199), a 95 % probability level, and thedegrees of freedom associated with the estimate of, andA = 5.0 % of the average, the value of the allowablevariation.7.5.2 No Reliable Estimate of vWhen there is no reliab
29、leestimate of v for the users laboratory, this equation should notbe used directly. Instead, specify the fixed number (10) ofspecimens. The number of specimens is calculated using v =9.5 % of the average. These values for v are somewhat largerthan usually found in practice. When a reliable estimate
30、of v forthe users laboratory becomes available, this equation willusually require fewer than the fixed number of specimens.8. Conditioning8.1 Bring the specimens to the moisture and temperatureequilibrium in the atmosphere for testing permanent rollederosion control products, that is a temperature o
31、f 21 6 2C (706 4F) and a relative humidity of 60 6 10 %.9. Procedure9.1 Test the conditioned specimens in the standard atmo-sphere specified in 8.1.9.2 Handle the test specimens carefully to avoid altering thenatural state of the material.9.3 With force applied to the presser foot on the base (notes
32、t specimen present), zero the measuring scale or record thebase reading. Lift the presser foot, center the test specimen onthe base under the presser foot, and bring the presser foot intothe contact with the material. Gradually increase the pressureto 0.2 kPa (0.029 psi). After the full force has be
33、en applied tothe presser foot for 5 s against the specimen, record thethickness to the nearest 0.2 mm and remove the specimen fromthe test device.9.4 Repeat the method for each of the remaining specimens.10. Calculation10.1 Calculate the average of the thickness for all testresults as read directly
34、from the test instrument.11. Report11.1 Report the following information for the nominalthickness:11.1.1 Project, type of permanent rolled erosion controlproduct tested, and method of sampling,11.1.2 Name or description of thickness apparatus used fortesting,D 6525 00 (2006)211.1.3 Dimensions of the
35、 presser foot and of the specimen,11.1.4 Loading time interval,11.1.5 Number of tests,11.1.6 Average nominal thickness,11.1.7 Coefficient of variation of thickness in the sample, inpercent (optional), and11.1.8 Any unusual or out-of-standard conditions or obser-vations made during the tests.ASTM Int
36、ernational takes no position respecting the validity of any patent rights asserted in connection with 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 entirel
37、y their own responsibility.This standard is subject to revision at any time by the responsible technical 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 sh
38、ould be addressed to ASTM International Headquarters. Your comments will receive careful consideration 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 St
39、andards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor 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).D 6525 00 (2006)3
