1、Designation: D 2041 03aStandard Test Method forTheoretical Maximum Specific Gravity and Density ofBituminous Paving Mixtures1This standard is issued under the fixed designation D 2041; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method cover
3、s the determination of the theo-retical maximum specific gravity and density of uncompactedbituminous paving mixtures at 25C (77F).1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to addres
4、s 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-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 670 Practice f
5、or Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD 979 Practice for Sampling Bituminous Paving MixturesD 4753 Guide for Evaluating, Selecting, and SpecifyingBalances and Standard Masses for Use in Soil, Rock, andConstruction Materials TestingE 1 Specification for
6、ASTM ThermometersE 12 Terminology Relating to Density and Specific Gravityof Solids, Liquids, and Gases33. Terminology3.1 The terms “specific gravity” and “density” used in thistest method are in accordance with Terminology E 12.3.2 Definitions of Terms Specific to This Standard:3.2.1 density, as de
7、termined by this test methodthe massof a cubic metre of the material at 25C (77F) in SI units.3.2.2 residual pressure, as employed by this test methodthe pressure in a vacuum vessel when vacuum is applied.3.2.3 specific gravity, as determined by this test methodthe ratio of a given mass of material
8、at 25C (77F) to the massof an equal volume of water at the same temperature.4. Summary of Test Method4.1 A weighed sample of oven-dry paving mixture in theloose condition is placed in a tared vacuum vessel. Sufficientwater at a temperature of 25C (77F) is added to completelysubmerge the sample. Vacu
9、um is gradually applied to reducethe residual pressure in the vacuum vessel to 4 kPa (30 mm ofHg) or less and then held for 15 6 2 min. At the end of thevacuum period, the vacuum is gradually released. The volumeof the sample of paving mixture is obtained by immersing thevacuum container with the sa
10、mple in a water bath andweighing or by filling the vacuum container level full of waterand weighing in air. Both the temperature and mass aremeasured at this time. From these mass and volume measure-ments, the specific gravity or density at 25C is calculated.5. Significance and Use5.1 The theoretica
11、l maximum specific gravities and densi-ties of bituminous paving mixtures are fundamental propertieswhose values are influenced by the composition of the mixturein terms of types and amounts of aggregates and bituminousmaterials.5.1.1 Maximum specific gravity is used (1) in the calcula-tion of air v
12、oids in the compacted bituminous paving mixture,(2) in calculating the amount of bitumen absorbed by theaggregate, and (3) to provide target values for the compactionof paving mixtures.6. Apparatus6.1 Containers:6.1.1 Vacuum BowlsEither a metal or plastic bowl with adiameter of approximately 180 to
13、260 mm (7 to 10.25 in.) anda bowl height of at least 160 mm (6.3 in.) shall be equippedwith a transparent cover fitted with a rubber gasket and aconnection for the vacuum line. Both the bowl and covershould be sufficiently stiff to withstand the applied vacuum1This test method is under the jurisdict
14、ion of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.21 onSpecific Gravity and Density of Bituminous Mixtures.Current edition approved Dec. 1, 2003. Published December 2003. Originallyapproved in 1964. Last previous edition approved in 2003 as D
15、2041 03.2For 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.3Withdrawn.1Copyright ASTM International, 100 Barr Ha
16、rbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.pressure without visibly deforming. The hose connection shallbe covered with a small piece of fine wire mesh to minimizethe loss of any fine material.NOTE 1The transparent cover allows observation of the release of airbubbles.6
17、.1.2 Vacuum Flask for Weighing in Air Only, a thick-walledvolumetric glass flask with a capacity of approximately 4000mL, fitted with a rubber stopper with a connection for thevacuum line. The hose connection in the flask should becovered with a small piece of fine wire mesh to minimize theloss of a
18、ny fine material6.2 Balance, capable of being read to the nearest 0.1 g andconforming to the requirements of Specification D 4753, ClassGP2. If underwater measurements will be taken, then thebalance shall be equipped with a suitable suspension apparatusand holder to permit weighing the sample while
19、suspendedfrom the center of the scale.6.3 Vacuum Pump or Water Aspirator, capable of evacuat-ing air from the vacuum container to a residual pressure of 4.0kPa (30 mm of Hg) or less.6.3.1 When a vacuum pump is used, a suitable trap shall beinstalled between the vacuum vessel and vacuum source toredu
20、ce the amount of water vapor entering the vacuum pump.6.4 Residual Pressure Manometer or Calibrated AbsolutePressure GageThis manometer or calibrated absolute pres-sure gage shall be used to confirm the specified pressure isapplied to the container and shall be capable of measuringresidual pressure
21、to 4.0 kPa (30 mm of Hg) or less. It is to beconnected at the end of the vacuum line using an appropriatetube and either a “T” connector on the top of the container orby using a separate opening (from the vacuum line) in the topof the container to attach the hose. To avoid damage, themanometer or ga
22、ge itself is not to be situated on top of thevessel but adjacent to it.NOTE 2Residual pressure in the vacuum vessel in millimetres ofmercury is the difference in the height of mercury.6.5 Manometer or Vacuum Gage, suitable for measuring thevacuum being applied at the source of the vacuum. This devic
23、ecan be connected directly to the vacuum source or be in thevacuum line close to the source.NOTE 3The vacuum leg of a residual pressure manometer occasion-ally acquires one or more air bubbles that introduce error into the residualpressure reading. The additional vacuum gage or manometer provides am
24、eans to quickly detect differences between the two vacuum measure-ments.6.6 ThermometersCalibrated liquid-in-glass thermom-eters of suitable range with subdivisions and maximum scaleerror of 0.5C (0.9F), or any other thermometric device ofequal accuracy, precision, and sensitivity shall be used. The
25、r-mometers shall conform to the requirements of SpecificationE1.6.7 Water Bath, capable of maintaining, by any means, aconstant temperature of 25 6 1C (77 6 1.8F). The water bathmust be suitable for immersion of the suspended container withits deaerated sample.6.8 Bleeder Valve, attached to the vacu
26、um train to facilitateboth the adjustment of the vacuum being applied to the vacuumvessel and the slow release of vacuum pressure.6.9 Mechanical Agitation Device, capable of applying agentle but consistent agitation of the sample. This device shallbe equipped with a means of firmly anchoring the con
27、tainer sothat it does not move on the surface of the device.NOTE 4If stripping of asphalt is a problem, the device can beequipped with a speed control.6.10 Oven, capable of maintaining a temperature of 110 65C (230 6 9F). This oven is needed when samples other thanlaboratory prepared mixtures using
28、oven-dry aggregate aretested.7. Sampling7.1 Obtain the sample in accordance with Practice D 979.7.2 The size of sample shall be as follows:Nominal Maximum Aggregate Size, mm Minimum Sample Size, g37.5 or greater 500019 to 25 250012.5 or smaller 15007.3 Sample sizes greater than about two thirds of t
29、he volumeof the container shall be tested in portions with none of theportions tested being less than 1250 g.8. Calibration of Containers8.1 BowlsCalibrate the container by accurately determin-ing the mass of the container immersed in water at 25 6 1C(77 6 1.8F). Designate this mass as B.8.1.1 If th
30、e bowl is used for weighing in air, place thevolumetric lid on the bowl while under water. Remove thewater-filled bowl with the lid in place and dry prior todetermining the combined mass of the bowl, lid, and water.Repeat three times and average the results. Designate theaverage mass as D.8.2 Flasks
31、Calibrate the volumetric flask by accuratelydetermining the mass of the flask filled with water at atemperature of 25 6 1C (77 6 1.8F). Designate this mass asD. Accurate filling of the flask shall be ensured by the use of aglass cover plate or similar smooth, flat transparent plate.9. Procedure9.1 I
32、f the paving mixture has been prepared in a laboratoryusing oven-dry aggregates, proceed to 9.2. Any other sampleneeds to be dried to a constant mass (mass repeats within 0.1 %for consecutive 15-min weighings) at a temperature of 105 65C (2216 9F).9.2 Once the sample is dry and while it is still war
33、m,separate the particles of the sample of paving mixture by hand,taking care to avoid fracturing the aggregate, so that theparticles of the fine aggregate portion are not larger than about6 mm. Cool the sample to room temperature. Additionalseparation of the mixture is needed so that the particles o
34、f thefine aggregate portion are not larger than about 6 mm. Place thesample directly into the tared bowl or volumetric flask. Do notuse a container within a container. Weigh the container with thesample and designate the net mass (mass of sample only) as A.9.3 Add sufficient water at a temperature o
35、f approximately25C (77F) to cover the sample completely. Place the cover(bowls) or stopper (flask) on the container.9.4 Place the container with the sample and water on amechanical agitation device and anchor it to the surface of theD 2041 03a2device. Start the agitation and immediately begin to rem
36、ove airtrapped in the sample by gradually increasing the vacuumpressure until the residual pressure manometer reads 3.7 6 0.3kPa (27.5 6 2.5 mm) of Hg. The vacuum should be achievedwithin 2 min. Once the vacuum is achieved, continue thevacuum and agitation for 15 6 2 min.9.5 Gradually release the va
37、cuum pressure using the bleedervalve and proceed with one of the following determinations:9.5.1 Weighing in WaterSuspend the bowl (without lid)and contents in water for 10 6 1 min, then determine the mass.Measure and record the temperature of the water in the bath.Designate the mass under water of t
38、he bowl and sample as C.9.5.2 Weighing in Air (Bowl)Slowly submerge the bowland sample in the 25 6 1C (77 6 1.8F) bath, where it shallremain for 10 6 1 min. The lid shall also be placed in the waterbath at the same time. Slide the lid onto the bowl withoutremoving from the water so as to avoid entra
39、pping any air, thenfirmly press the lid down on the bowl. Remove the bowl withthe lid in place from the water bath. Carefully dry the bowl andlid. Determine the mass of the bowl, sample, and lid. Measureand record the temperature of the water in the bowl. Repeat thisprocedure a second time by removi
40、ng the lid and placing boththe lid and the bowl back in the water. It is not necessary towait the 10 minutes before taking the second reading. If themass varies by more than 1.0 g, repeat the procedure until anytwo mass readings are within 1.0 g. Designate the average massof these two readings as “E
41、; the mass of the bowl, lid, water,and sample.”9.5.3 Weighing in Air (Flask)Slowly fill the flask withwater taking care not to introduce air into the sample. Place theflask in a water bath for 10 6 1 min to stabilize the temperaturewithout submerging the top of the flask. Measure and recordthe tempe
42、rature of the water in the flask. Remove the ther-mometers and completely fill the flask using a cover plate,taking care not to entrap air beneath the cover plate. The coverplate shall be the same one used during the calibration of theflask. Wipe any moisture from the exterior of the container andco
43、ver plate. Determine the mass of the flask, plate, and itscontents completely filled with water. Designate this mass as E.10. Calculation10.1 Calculate the maximum specific gravity of the sampleas follows:10.1.1 Bowls Used Under Water Determination:Gmm5AA2C2B!(1)where:Gmm= maximum specific gravity o
44、f the mixture,A = mass of dry sample in air, g,B = mass of bowl under water, g, andC = mass of bowl and sample under water, g.10.1.2 Bowl in Air Determination:Gmm5AA 1 D 2 E(2)where:Gmm= maximum specific gravity of the mixture,A = mass of dry sample in air, g,D = mass of lid and bowl with water at 2
45、5C (77F), g,andE = mass of lid, bowl, sample, and water at 25C(77F), g.10.1.3 Flask Determination:Gmm5AA 1 D 2 E(3)where:Gmm= maximum specific gravity of the mixture,A = mass of dry sample in air, g,D = mass of cover plate and flask filled with water at25C (77F), g, andE = mass of flask, cover plate
46、, sample, and water at25C (77F), g.10.2 If the sample was tested in several portions, report theweighted average maximum specific gravity for all portionstested.11. Supplemental Procedure for Mixtures ContainingPorous Aggregate11.1 If the pores of the aggregates are not thoroughly sealedby the bitum
47、inous film, they may become saturated with waterduring the vacuum procedure. To determine if this has oc-curred, proceed as follows after completing the procedure inaccordance with 9.5.1, 9.5.2, or 9.5.3.11.1.1 Drain the water from the container. To prevent theloss of fine particles, decant the wate
48、r through a 75 m (No.200) sieve.11.1.2 Break several of the large pieces of aggregate andexamine the broken surfaces for wetness. If there is any doubtas to whether the mix has absorbed water, proceed with thisprocedure in order to determine if this correction is needed.11.2 If aggregate has absorbe
49、d water, spread the sample ona flat tray with a nonabsorptive surface and place in front of afan to remove surface moisture. Break agglomerations ofmixture by hand. Stir the sample intermittently in such a waythat the aggregate particles are rolled over rather than simplymoved horizontally on the tray. This process takes about 2 h.Take care to prevent the loss of particles of mixture.11.3 Weigh the tray and sample at 15-min intervals. Whenthe loss in mass is less than 0.05 % for this interval, the samplemay be considered to be surface
