1、Designation: D 6704 08Standard Test Method forDetermining the Workability of Asphalt Cold Mix PatchingMaterial1This standard is issued under the fixed designation D 6704; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number 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 provides a procedure for determinationof the workability of asphalt cold mix patching materials.1.2 T
3、his test method is applicable to asphalt cold mixpatching materials that will be stockpiled or packaged incontainers, subjected to different climatic conditions, and laterused for roadway patching operations.1.3 The within-laboratory repeatability standard deviationhas been determined to be 10 % bas
4、ed on one lab, three testreplicates, and two different samples. The between-laboratoryreproducibility of this test method is being determined and willbe available on or before August 2013. Therefore, this testmethod should not be used for purchasing purposes.1.4 The values stated in SI units are to
5、be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This procedure may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user
6、 of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 702 Practice for Reducing Samples of Aggregate toTesting SizeD8 Terminology Relating to Materials for Roads and P
7、ave-mentsD75 Practice for Sampling AggregatesD 3665 Practice for Random Sampling of ConstructionMaterialsD 4753 Guide for Evaluating, Selecting, and SpecifyingBalances and Standard Masses for Use in Soil, Rock, andConstruction Materials TestingD 5581 Test Method for Resistance to Plastic Flow ofBitu
8、minous Mixtures Using Marshall Apparatus (6 inch-Diameter Specimen)3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 workabilitythe average maximum resistance to pen-etration by a designated penetrometer into a compacted asphaltcold mix that is confined in a designated box.3.2 D
9、efinitions for other terms used in this test method maybe found in Terminology D8or a standard unabridged dictio-nary.4. Summary of Test Method4.1 This test method is used to determine the relative valuefor workability of an asphalt cold mix patching material to beused under different climatic condi
10、tions.4.2 Cold patching samples are obtained from the asphaltcold mix stockpile or removed from its container, cooled to aspecified temperature, and measured for workability.5. Significance and Use5.1 This test method may be used to generate informationconcerning the potential characteristics of han
11、dling, placing,compaction, and performance of an asphalt cold mix.5.2 Workability is one of the main factors that influences thesuitability and ultimately the performance of asphalt cold mixsuitability for use as a roadway patching material.5.3 This test method is applicable to asphalt cold mixesman
12、ufactured with modified or unmodified asphalt emulsions,cutback asphalts, or combinations thereof.6. Interferences6.1 Differences in the aggregate gradation, size, shape, andsurface properties, and the residual asphalt binder can signifi-cantly affect the workability test method values.1This test me
13、thod is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.27 onCold Mix Asphalts.Current edition approved Dec. 1, 2008. Published December 2008. Originallyapproved in 2001. Last previous edition approved in 2001 as D 6704 01
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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box
15、 C700, West Conshohocken, PA 19428-2959, United States.6.2 Procedure variances can affect the values obtained.Careful adherence to this test method will decrease thelikelihood of differences caused by departures from procedureparameters.7. Apparatus7.1 Freezer, capable of maintaining a temperature o
16、f 10 61C.7.2 Balance, conforming to the requirements of Specifica-tion D 4753, Class GP5.7.3 Boxes, three square workability boxes or other similarmolds, constructed to measure 165 by 165 by 50-mm deepinside dimensions and sufficiently rigid for forming and mea-suring the asphalt cold mix specimens
17、(Fig. 1).7.4 Compaction Hammer, specified in Test Method D 5581with a flat tamping foot (Fig. 2) of 150 by 150 by 6-mm thickattached to the bottom of the hammer and a 4536-g slidingweight with a free fall of 457.2 mm.7.5 Compression Testing Machine, as specified in TestMethod D 5581 and modified as
18、necessary to provide at least45 s of loading.NOTE 1Instead of the compression testing machine, any suitableload-measuring device may be used provided capacity and sensitivitymeet the above requirements.7.6 Blade, a flat steel penetration blade (Fig. 3) measuring130 mm wide, 50 mm in height and 3 mm
19、thick attached to theadapter at the bottom of the proving ring.7.7 Utensils, for handling and transferring mixture samples.8. Hazards8.1 Observe standard laboratory safety precautions whenpreparing and measuring cold mix asphalt specimens.9. Sampling9.1 Obtain field samples in accordance with Practi
20、ceD 3665.9.2 Alternate 1, Stockpile or Packaged Material:9.2.1 After stirring the stockpile, obtain 3 samples in accor-dance with Practice D75 or obtain 3 samples from thecontainer.NOTE 2Asphalt cold mixes that are in stockpile for some time maydevelop a crust on the surface of the pile. This crust
21、should be removed toa depth of 100 mm, over an area of 1 m2, to expose the unweathered mix.9.2.2 Use standard quartering procedures as detailed inPractice C 702 to obtain a 2500 6 100-g laboratory samplefrom each of the 3 field samples.9.3 Alternate 2, Plant Mixed Material:9.3.1 Obtain 3 samples in
22、accordance with Practice D 3665,of cold mix from the material proposed for use.9.3.2 Use standard quartering procedures as detailed inPractice C 702 to obtain a 2500 6 100-g laboratory samplefrom each of the 3 field samples.10. Standardization10.1 Verify calibration of the freezer.11. Procedure11.1
23、Workability:11.1.1 Allow the material to stabilize at ambient laboratorytemperature (25 6 3C).11.1.2 Weigh the material in three separate boxes theamount (about 2 kg) that will result in a compacted specimenheight of 48 to 50 mm.11.1.3 Spread the mix uniformly over the box and level themix, avoiding
24、 any segregation. Discard any excess material.11.1.4 Place the box with the material on any hard and levelsurface, and place the compaction hammer with the modifiedfoot close to the center of the box and apply two blows with thehammer.11.1.5 Place the compacted material and box in the freezerat 10 6
25、 1C for a minimum of 12 h but no longer than 24 h.11.1.6 Attach the penetration blade (see 7.6) to the adapterat the bottom of the proving ring of the Marshall apparatus withthe blade parallel to the front of the machine.11.1.7 Adjust the dial indicator to zero.FIG. 1 Workability BoxFIG. 2 Flat Tamp
26、ing FootFIG. 3 Penetration BladeD670408211.1.8 Immediately transfer the box with the compactedmaterial from the freezer to the loading jack. Place it under theblade and on the support stand, ensuring that it is level andfirmly seated on the support stand.NOTE 3The blade should be centered on the mid
27、dle of the sample.11.1.9 Switch on the motor and bring the specimen close tothe blade and continue the upward movement of the jack headand start the timer when the dial indicator begins to move.Watch the dial carefully and record the highest readingobserved during 30 s of penetration.NOTE 4The rate
28、of penetration used in this test method is the same asTest Method D 5581, 50.8 mm.11.1.10 Stop the motor, lower the jack head and remove thespecimen from the apparatus. The elapsed time for the testfrom removal of the test specimen from the freezer to thecompletion of the 30-s penetration shall not
29、exceed 1 min.11.1.11 Repeat the preceding procedure on the other twospecimens.12. Report12.1 Report the average of the three readings.13. Workability13.1 The typical ranges of workability for asphalt coldmixes are shown in Table 1. The typical rates of workabilityshown in Table 1 may be adjusted for
30、 variations in thetemperature ranges required for use.14. Precision and Bias14.1 The within-laboratory repeatability standard deviationhas been determined to be 10 % based on one lab, three testreplicates, and two different samples. The between-laboratoryreproducibility of this test method is being
31、determined and willbe available on or before August 2013. Therefore, this testmethod should not be used for purchasing purposes.REFERENCES(1) Ministry of Transportation of Ontario “Ontario Laboratory StandardLS289.”(2) Tam, K. K. and Lynch, D. F., “New Methods for Testing Workabilityor through the A
32、STM website(www.astm.org).TABLE 1 Workability Temperature RangesWorkability, N Temperature Range, CA225 to 500 -22 to -1501 to 1000 -12 to 101001 to 2000 -1 to 212001 to 4000 10 to 324001 to 8000 21 to 43AExperience has shown that cold mixes with workability in the ranges shownare suitable for use in the corresponding ambient temperature ranges.D6704083
