1、Designation: D 6937 08Standard Test Method forDetermining Density of Emulsified Asphalt1This standard is issued under the fixed designation D 6937; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、 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 the determination of density ofemulsified asphalt used in highway construction. This unit iscomputed by determining t
3、he mass of an emulsified asphaltcontained in a standard measure of known volume.1.2 This test method 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
4、determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:E1 Specification for ASTM Liquid-in-Glass Thermometers3. Significance and Use3.1 This test method provides a controlled laboratory testfor the determination of quantitative volumes of emulsi
5、fiedasphalt for use in bills of lading, invoicing, and applicationrates.4. Sample Conditioning for Testing4.1 All emulsified asphalts shall be properly stirred toachieve homogeneity before testing.4.2 All emulsified asphalts with viscosity testing require-ments of 50C shall be heated to 50 6 3C in t
6、he originalsample container in a water bath or oven. The container shouldbe vented to relieve pressure. After the sample reaches 50 63C, stir the sample to achieve homogeneity.4.3 Emulsified asphalts with viscosity testing requirementsof 25C should be mixed or stirred at 25 6 3C in the originalsampl
7、e container to achieve homogeneity.NOTE 1Emulsified asphalts with viscosity testing requirements of25C may be heated and stirred as specified in 4.2 if necessary. In theevent the 4.2 method is used, the sample should be cooled to 25 6 3Cbefore testing.5. Apparatus5.1 Density CupStainless steel measu
8、re of known stan-dard volume (83.2 mL).5.2 Balancecapable of being read to the nearest 0.01 g.5.3 Water Bathconstant-temperature, maintained at 25 60.5C.5.4 ThermometerASTM 17C or 17F conforming to therequirements of Specification E1or equivalent thermometricdevice.6. Procedure6.1 Stir the emulsifie
9、d asphalt sample and place in aconstant-temperature water bath maintained at 25 6 0.5C forapproximately 1 hr.6.2 Place the measure and its cap on the balance, tare, andzero the balance.6.3 Remove the emulsified asphalt sample from the bath andstir, using care to avoid trapping air in the sample. If
10、necessary,strain through a 850-m sieve to remove any skin or film thatmight be present in the emulsified asphalt.6.4 Bring the measure to approximately 25C and pour theemulsified asphalt into the measure, filling it completely (orwithin 2 mm of the rim).6.5 Start placing the cap into the measure and
11、 remove, witha clean dry rag or paper, the excess emulsified asphalt oozingthrough the orifice in the cap.6.6 When the cap is placed on tightly, clean the measurecarefully, weigh on the tared balance to the nearest 0.01 g, andrecord.7. Calculation7.1 Calculate the density of the emulsified asphalt a
12、s fol-lows:W 5 G!11.98! (1)where:W = unit density of the emulsified asphalt, as expressed ing/L, andG = mass of emulsified asphalt in the measure, g.NOTE 2If the desired units are to be expressed in pounds per gallonat 25C, then the calculation would be W = G/10. Pounds per gallon at25C may be trans
13、lated to pounds per gallon at 15.6C by using a1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved July 15, 2008. Published August 2008. Originallyappro
14、ved in 2004. Last previous edition approved in 2004 as D 6937 04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.multiplier of 1.00475. The calculation of Imperial gallon mass may bemade by using the proper conversion factors.8. Repo
15、rt8.1 Report the unit density of the emulsified asphalt in g/Lto the nearest whole unit at 25C.9. Precision and Bias9.1 The following criteria should be used for judging theacceptability of results (95 % probability):9.1.1 Duplicate results by the same operator should not beconsidered suspect unless
16、 they differ by more than the follow-ing amount:Unit Mass Repeatabilitygrams per litre 25C 0.0199.1.2 The results submitted by each of two laboratoriesshould not be considered suspect unless they differ by morethan the following amount:Unit Mass Reproducibilitygrams per litre 25C 0.0349.2 The bias o
17、f this test method cannot be determinedbecause no material having an accepted reference value isavailable.10. Keywords10.1 asphalt emulsion; cationic emulsified asphalt; density;emulsified asphalt; emulsion; weight per gallonAPPENDIX(Nonmandatory Information)X1. RECOMMENDED CUP STANDARDIZATION PROCE
18、DUREX1.1 The weight per gallon cup has been used for testing ofvarious materials (emulsified asphalts, paints, lacquer, otherliquids) for a number of years. This Appendix is intended toprovide a recommended basis for the verification of thecapacity of the cup, or a cup factor to make determinationsm
19、ore accurate.X1.2 Recommended ProcedureWeigh the empty cup withcover and record the weight (optional: tare the balance).Condition the cup and distilled water to 25 6 0.5C (77 61F). Fill the cup within 2 mm of the rim with the distilledwater, being careful not to incorporate any air bubbles.Carefully
20、 place the cover on the cup, and seal it with a rotarymotion. Wipe off the excess water that exudes through the holein the cover and around the rim. Reweigh the filled cup, coverand water after wiping and find the net weight of water(optional: read weight directly from previously tared balance).Net
21、weight of water 5 final weight empty weightIt is recommended that this process be repeated 3 times foreach cup, with the data being averaged, to get a reading asaccurate as possible.X1.3 Recommended CalculationThe cup factor is calcu-lated by dividing the net weight value from above into 83.205.X1.3
22、.1 Example 1: If the cup actually holds 83.000 g:83.205 / 83.000 5 1.0025. Multiply all cup readings by 1.0025.X1.3.2 Example 2: If the cup actually holds 83.400 g:83.205 / 83.400 5 0.9977. Multiply all cup readings by 0.9977.X1.4 Useful ConversionsThe following conversions arefor pounds per U.S. ga
23、llon and specific gravity at 25C:pounds per U.S. gallon 5gram weight of cup contents!30.1000!3cup factor!specific gravity 5gram weight of cup contents!30.01202!3cup factor!ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned
24、in 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 technical committee and m
25、ust 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 consideration at a meeting of t
26、heresponsible 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 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).D6937082
