ASTM D4892-2014 Standard Test Method for Density of Solid Pitch &40 Helium Pycnometer Method&41 《固体沥青密度40 氦比重瓶测定比重法41 的标准试验方法》.pdf

《ASTM D4892-2014 Standard Test Method for Density of Solid Pitch &40 Helium Pycnometer Method&41 《固体沥青密度40 氦比重瓶测定比重法41 的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM D4892-2014 Standard Test Method for Density of Solid Pitch &40 Helium Pycnometer Method&41 《固体沥青密度40 氦比重瓶测定比重法41 的标准试验方法》.pdf（3页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: D4892 14Standard Test Method forDensity of Solid Pitch (Helium Pycnometer Method)1This standard is issued under the fixed designation D4892; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A

2、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 U.S. Department of Defense.1. Scope*1.1 This test method covers the determination of pit

3、chdensity by helium pycnometer. It is applicable at a range ofroom temperatures of 15 to 35C.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, as

4、sociated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D71 Test Method for Relative Density of Solid Pitch and

5、Asphalt (Displacement Method)D2320 Test Method for Density (Relative Density) of SolidPitch (Pycnometer Method)D2962 Practice for Calculating Volume-Temperature Cor-rection For Coal-Tar PitchesD4296 Practice for Sampling PitchE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3. Termino

6、logy3.1 Definitions of Terms Specific to This Standard:3.1.1 density, as determined by this test method the massper unit volume and shall be reported as follows:density, 25C, g/cm3grams per cubic centimeter! (1)4. Summary of Test Method4.1 The sample is pulverized and screened to a givenfraction, th

7、en the volume of a weighed portion of the fractionis determined using a helium pycnometer.5. Significance and Use5.1 This test method is useful in characterizing pitches asone element in establishing uniformity of shipments andsources of supply. With this method, the density is determinedto two deci

8、mal places, which is sufficient for most applications.If a more precise measurement is required (three decimalplaces), use Test Methods D2320 or D71.6. Apparatus6.1 Helium Pycnometer.36.2 Balance, capable of weighing a 150-g specimen towithin 1 mg.6.3 Sieves, U.S. Standard 2.36-mm (No. 8), 600-m (No

9、.30), conforming to Specification E11.6.4 Thermometer, for measuring room temperature.7. Bulk Sampling7.1 Samples from shipments shall be taken in accordancewith Practice D4296 and shall be free of foreign substances.8. Dehydration8.1 All bulk samples suspected of having free moistureshould be air-d

10、ried or oven-dried at 50C in a convection orforced-air oven before analyzing.9. Preparation of Test Specimen9.1 Crush a 50 to 200-g representative portion of the drypitch until all of it passes the 2.36 mm (No. 8 sieve). Avoid1This test method is under the jurisdiction of ASTM Committee D02 onPetrol

11、eum Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.Current edition approved May 1, 2014. Published May 2014. Originallyapproved in 1989. Last previous edition approved in 2009 as D4892 89 (2009)

12、.DOI: 10.1520/D4892-14.2For 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.3Helium pycnometers available from the

13、 following suppliers have been foundsatisfactory for this purpose: (a) Beckman 2500 Harbor Blvd., Fullerton, CA, (b)Micromeritics, 5680 Goshen Springs Rd., Norcross, GA, and (c) Quantachrome, 5Aerial Way, Syosset, NY. If you are aware of alternative suppliers, please providethis information to ASTM

14、International Headquarters. Your comments will receivecareful consideration at a meeting of the responsible technical committee1, whichyou may attend.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,

15、PA 19428-2959. United States1grinding the pitch. Remove the fines by screening through the600 m (No. 30 sieve) and use the pitch retained on this sieveas the test specimen.10. Calibration of Helium Pycnometer10.1 Calibrate daily or before using, following instrumentmanufacturers instructions.11. Pro

16、cedure11.1 Place 10 to 150 g (80 to 90 % of the maximum capacityof the particular holder being used) of the prepared crushed andsized fraction into the required specimen holder provided withthe instrument. Weigh to the nearest milligram.11.2 Determine volume of pitch following manufacturersinstructi

17、ons.11.3 Weigh specimen container after determination; if thisweight is lower than the initial weight, the specimen has lostmoisture or volatiles during the density determination. Use thelower weight in determining the density. Also, if the specimenappears to have free moisture, dry the specimen as

18、specified in8.1, and repeat the density determination.11.4 Record the room temperature during the density deter-mination.12. Calculation12.1 The procedure described in this test method determinesthe volume of a given mass of pitch at the ambient temperature(room temperature) of the helium pycnometer

19、. Since thevolume of a given mass of pitch is temperature-dependent, thedensity of the given specimen will vary with the ambienttemperature. The variation of pitch volume with temperaturehas been previously established (Test Method D2962 and theliterature4), and the following calculation corrects al

20、l densitymeasurements to 25C.12.2 The density of pitch, corrected to 25C, is given by thegeneral formula:d25C5WVt160.00047 t#(2)where:W = specimen mass, g,Vt= volume of specimen, cm3, at measurementtemperature,t = difference between 25C and the measurementtemperature, andd25C= pitch density at 25C,

21、g/cm3.The factor 0.00047/C is obtained from the literature4andTest Method D2962.12.3 Calculate the density of the pitch (to three decimalplaces) using the following equation:d25C5WVtcorrection factor#(3)The correction factors for measurement temperatures of 15to 35C are given in Table 1.12.4 Example

22、A specimen of pitch having a mass of20.027 g was found to have a volume of 15.26 cm3at atemperature of 30C; the density calculation is as follows:d25C520.027 g15.26 cm30.998#5 1.315 g/cm3(4)12.5 Average duplicate results and round off to two decimalplaces.13. Report13.1 Report density of the pitch t

23、o two decimal places asfollows: density, 25C, g/cm3.14. Precision and Bias514.1 PrecisionThe following criteria shall be used for theacceptability of results (95 % probability):14.1.1 RepeatabilityDuplicate values by the same opera-tor shall not be considered suspect unless they differ by morethan 0

24、.02.14.1.2 ReproducibilityThe values reported by each of twolaboratories, representing the arithmetic average of duplicatedeterminations, shall not be considered suspect unless thereported values differ by more than 0.03.14.2 BiasDuring the interlaboratory study to determinethe precision of this tes

25、t method, the density was also deter-mined by Test Method D2320 (water pycnometer). It wasfound that the density determined by helium pycnometer washigher than that determined by water pycnometer by anaverage value of 0.004.15. Keywords15.1 density; helium pycnometer; pitch4Mapstone, G. E., “Specifi

26、c Gravity of Coal Tar Fractions,” Journal of AppliedChemistry, October 5, 1955, pp. 582588.5Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D08-1003.TABLE 1 Volume Correction Factors Versus MeasurementTemperatureMeasurement Tempe

27、rature, C Correction Factor15 1.00516 1.00417 1.00418 1.00319 1.00320 1.00221 1.00222 1.00123 1.00124 1.00025 1.00026 1.00027 0.99928 0.99929 0.99830 0.99831 0.99732 0.99733 0.99634 0.99635 0.995D4892 142SUMMARY OF CHANGESSubcommittee D02.05 has identified the location of selected changes to this st

28、andard since the last issue(D4892 89 (2009) that may impact the use of this standard. (Approved May 1, 2014.)(1) Revised Eq 3 in subsection 12.3.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of

29、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 technical committee and must be reviewed every five

30、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 consideration at a meeting of theresponsible technical com

31、mittee, 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 Harbor Drive, PO Box C700, West Conshohocken, PA 1

32、9428-2959,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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D4892 143