1、Designation: D6372 15Standard Practice forDesign, Testing, and Construction of Microsurfacing1This standard is issued under the fixed designation D6372; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A n
2、umber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the design, testing, and constructionof mixtures of polymer modified asphalt emulsion, mineralaggregate, mineral fi
3、ller, water, and other additives, properlyproportioned, mixed and spread on a paved surface. It iswritten as a guide and should be used as such. End usespecifications should be adapted to conform to job and userrequirements.NOTE 1This practice references test methods outside the jurisdictionof ASTM
4、that may or may not have a precision statement.1.2 The values stated in SI units are to be regarded as thestandard.1.3 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
5、safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C88 Test Method for Soundness of Aggregates by Use ofSodium Sulfate or Magnesium SulfateC131 Test Method for Resistance to Degradation of Small-Size Coarse A
6、ggregate by Abrasion and Impact in the LosAngeles MachineD2397 Specification for Cationic Emulsified AsphaltD2419 Test Method for Sand Equivalent Value of Soils andFine AggregateD3910 Practices for Design, Testing, and Construction ofSlurry SealE145 Specification for Gravity-Convection and Forced-Ve
7、ntilation Ovens2.2 ISSA Documents:ISSA Technical Bulletin No. 100,Test Method forWetTrackAbrasion of Slurry Surfaces3ISSA Technical Bulletin No. 109, Test Method for Measure-ment of ExcessAsphalt in Bituminous Mixtures by Use ofa Loaded Wheel Tester and Sand AdhesionISSA Technical Bulletin No. 139,
8、Test Method to ClassifyEmulsified Asphalt/Aggregate Mixture Systems by Modi-fied Cohesion Tester, Measurement of Set and CureCharacteristics3ISSA A143 Revised May 2003 Recommended PerformanceGuidelines For Micro-Surfacing3ISSA Technical Bulletin No. 144, Test Method for Classifi-cation of Aggregate
9、FillerBitumen Compatability bySchultze-Breuer and Ruck ProceduresISSA Technical Bulletin No. 147, Test Methods for Mea-surements of Stability and Resistance to Compaction,Vertical and Lateral Displacement of Multilayered FineAggregate Cold Mixes33. Terminology3.1 Definitions of Terms Specific to Thi
10、s Standard:3.1.1 polymer modified emulsified asphalt micro surfacingmixturesas related to this practice, mixtures of fine aggregatewith mineral filler, mixing water, and field control additive,uniformly mixed with polymer modified emulsified asphalt.4. Summary of Practice4.1 This practice outlines t
11、he basic properties for materials,mix design procedures, and application techniques for thedesign and application of microsurfacing. The mix developedthrough this practice should be capable of being spread invariable thick cross sections, which after curing and initialtraffic consolidation, resist c
12、ompaction through the entiredesign tolerance range of bitumen content and variable thick-ness to be encountered.The end product should maintain a highfriction surface and variable thick sections throughout itssurface life. The mix should be a quick traffic system andshould be able to accept rolling
13、traffic on a 12.7 mm thicksurface within 1 h after placement in 24C temperature and50 % or less humidity.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.24 onAsphalt Surface Treatments.Current edition app
14、roved June 15, 2015. Published August 2015. Originallyapproved in 1999. Last previous edition approved in 2010 as D6372 05 (2010).DOI: 10.1520/D6372-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSta
15、ndards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from International Slurry Surfacing Association, 3 Church Circle,PMB 250, Annapolis, MD 21401.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Unit
16、ed States15. Significance and Use5.1 This microsurfacing practice is written as a guide andshould not be construed as a specification. End use specifica-tions should be adapted to conform to job and user require-ments.6. Design6.1 AggregatesThe aggregate shall be a manufacturedcrushed stone such as
17、granite, slag, limestone, chat, or otherhigh quality aggregate or combination thereof. The aggregateshall be totally crushed with 100 % of the parent aggregatebeing larger than the largest stone in the gradation to be used.Recommended grading requirements are shown in Table 1.When tested by Test Met
18、hod D2419, the combined aggregateprior to the addition of any chemically active mineral fillershall have a sand equivalent of not less than 65. When tested byTest Method C88 the aggregate shall have a weighed averageloss not greater than 15 % using sodium sulfate or 25 % usingmagnesium sulfate. Test
19、ing by Test Method C131 shall showan abrasion resistance of 30 % maximum.6.2 Mineral FillerMineral filler shall be any recognizedbrand of nonairentrained portland cement or hydrated lime.The mineral filler shall be free of lumps and accepted uponvisual inspection. The type and amount of mineral fill
20、er neededshall be determined by a laboratory mix design and will beconsidered as part of the aggregate gradation.6.3 Emulsified AsphaltThe emulsified asphalt shall be aquick set polymer modified asphalt emulsion conforming to therequirements of Specification D2397 for CSS-1h. The polymermaterial sha
21、ll be milled or blended into the asphalt or emulsi-fier solution prior to the emulsification process. The cementmixing test shall be waived for this emulsion. The five daysettlement test may be waived. Refer to ISSADocumentA143.7. Composition of Microsurfacing Mixtures7.1 A job mixture shall be sele
22、cted that conforms to thespecifications for a quick traffic system, meaning that it will beable to accept traffic after a short period of time and is capableof being spread in variable cross sections, wedges, ruts, scratchcourses, and surfaces and that after curing and initial trafficconsolidation r
23、esists compaction throughout the entire designtolerance range of bitumen content and variable thickness to beencountered. The mixture should maintain a high frictionsurface, and variable thick sections throughout the service lifeof the mixture. The mixture shall be able to accept rollingtraffic on a
24、 12.7 mm thick surface within 1 h after placement at24C temperature and 50 % or less humidity. The mixture shallconform to one of the gradation types listed in Table 1. Type IIis suitable for urban and residential streets and airport runways.It shall be applied at the minimum rate of 5.4 to 8.1 kg/m
25、2.Type III is suitable for primary and interstate routes and to fillwheel ruts. It shall be applied at the rate of 8.1 to 16.2 kg/m2.for primary and interstate routes. The application for wheel rutsshall be as prescribed in Appendix X1.8. Test Procedures For Mix Design of Polymer ModifiedEmulsified
26、Asphalt Microsurfacing Systems8.1 Cohesion Test:8.1.1 This test procedure is used to determine various settimes of the microsurfacing mixture. It measures torque of amicrosurfacing mixture as it coalesces and develops cohesivestrength. The amount of torque developed plotted over timeshows how the mi
27、xture is developing resistance to movement.Specific torque and time values are defined as “set time” and“early rolling traffic time” (see Fig. 1).8.1.2 Set time is defined as the lapsed time after casting aspecimen of the microsurfacing mixture after which it cannotbe remixed homogeneously (there is
28、 no free emulsion tolubricate the system) and no lateral displacement is possiblewhen it is compacted. It is further defined as the time whenthere are no signs of free emulsion when pressed with anabsorptive paper towel and there is no free emulsion dilutedand washed away when rinsed with water.8.1.
29、3 Early rolling traffic time is defined as the time at whichthe microsurfacing mixture will accept rolling traffic withoutpicking or deformation.8.1.4 Set times for the microsurfacing mixture shall bedetermined as outlined in 6.3 of Practice D3910.NOTE 2Referenced ISSA Technical Bulletin No. 139.8.2
30、 Wet Track Abrasion Test:8.2.1 This test procedure is used to determine the minimumasphalt content and resistance to abrasion.TABLE 1 Grading RequirementsSieve SizeType II PercentPassingType III PercentPassingStockpile Tolerance9.5 mm 100 1004.75 mm 90 to 100 70 to 90 5 %2.36 mm 65 to 90 45 to 70 5
31、%1.18 mm 45 to 70 28 to 50 5 %600 m 30 to 50 19 to 34 5 %330 m 18 to 30 12 to 25 4 %150 m 10 to 21 7 to 18 3 %75 m 5 to 15 5 to 15 2 % FIG. 1 Classification of Mix Systems by Modified Cohesion TestCurvesD6372 1528.2.2 It establishes the minimum permissible emulsion con-tent of a given microsurfacing
32、 system and the long termmoisture susceptibility of the system.8.2.3 The test shall be run in accordance with PracticeD3910, Section 6.4.NOTE 3Referenced ISSA Technical Bulletin No. 100.FIG. 2 Loaded Wheel TesterD6372 1538.3 Loaded Wheel TestThis test procedure measures theamount of compaction and d
33、isplacement characteristics ofmulti-layered microsurfacing mixtures under simulated rollingtraffic compaction (see Fig. 2).8.3.1 Summary of Test Procedure:8.3.1.1 A 500 g dry aggregate weight mixture is preparedusing 0/#4 or other gradation aggregate and the desiredquantities of fillers, water, addi
34、tives, and asphalt emulsion.After 30 s of vigorous mixing, the mixture is cast into 12.7 by50.8 mm by 38.1 cm mold centered over a 0.60 mm mountingplate and immediately struck-off uniformly with a woodendowel or U shaped wooden screed using a sawing action. Theinside surfaces of the mold may be coat
35、ed with a thin coatingof petroleum jelly or a mixture of glycerin and talc as a moldrelease to prevent sticking.8.3.1.2 As soon as the mixture is sufficiently set to preventfree flow, the mold is carefully removed without disturbing thespecimen. The specimen is air cured for 24 h, then dried to acon
36、stant weight in a forced draft oven at 60C for 18 to 20 h.After cooling, the specimen is measured centrally for widthand net thickness. The net weight of the specimen is obtainedand recorded. The specimen is then mounted in the loadedwheel track machine and subjected to 1000, 56.7 kg cycles ofcompac
37、tion. The specimen is then removed and immediatelyremeasured laterally in the wheel path and the results recorded.The lateral displacement is expressed as the percent increase ofthe original width. The specific gravity should be expressed asthe increase by percent after compaction of the specimen.8.
38、3.2 Apparatus:8.3.2.1 Balance, capable of weighing 2000 g or more towithin 6 1.0 g.8.3.2.2 Loaded Wheel Tester, (as described in ISSA TB109)consisting of a 7.62 cm diameter soft rubber wheel loaded with56.7 kg which reciprocates through a 30.48 cm horizontal pathat the rate of 44 cycles per minute.8
39、.3.2.3 Suitable Heavy Gage Round Bottom Bowl, suitableto prepare 500 gram mixes.8.3.2.4 Long Handled Steel Spoon, or suitable spatula formixing of aggregate emulsion mixtures.8.3.2.5 Specimen Mounting Plate, (0.60 mm galvanizedsteel 7.62 by 40.6 cm, deburred).8.3.2.6 Specimen Mold, 12.7 mm thick by
40、76.2 mm 40.6cm outside and 50.8 mm by 38.1 cm inside dimensions.8.3.2.7 Calipers, capable of measuring specimen width towithin 0.01 mm.8.3.2.8 Oven, forced draft constant temperature thermostati-cally controlled at 60 6 3C. See specification E145 Type IIB.8.3.3 Preparation of Test Specimen:8.3.3.1 A
41、 500 gram dry weight aggregate mixture is pre-pared using the 4.75 mm and smaller fractions, the desiredquantities of fillers, water additives, and asphalt emulsion.8.3.3.2 After 30 s of vigorous mixing, cast the mixture intothe mold, centered over the 0.60 mm mounting plate andimmediately struck-of
42、f uniformly with a wooden dowel or Ushaped wooden screed using a sawing action. The castingoperation should be completed within 15 s so that no more than45 s has elapsed from starting the mix to finishing thespecimen.8.3.3.3 As soon as the mixture is sufficiently set to preventfree flow, carefully r
43、emove the mold without disturbing thespecimen. Then air-cure the specimen for 24 h and then dry toa constant weight in a forced draft oven at 60C for 18 to 20 h.8.3.3.4 After cooling for2htoroom temperature, measurethe specimen with the calipers for net lateral thickness.8.3.3.5 Then mount the speci
44、men in the loaded wheel testermachine and subject it to 1000 cycles of compaction at atemperature of 226 2C.8.3.3.6 Then remove the specimen from the loaded wheeltester machine and immediately remeasure laterally.8.3.3.7 Reference Document ISSA Technical Bulletin No.147.8.4 Classification TestThis t
45、est procedure covers the de-termination of the relative compatibility between aggregatefiller of specific gradation and emulsified asphalt residue.8.4.1 Summary of Test ProcedureThe test procedure pro-vides a rating system or grading values for abrasion loss,adhesion, and high temperature cohesion c
46、haracteristics of aspecified aggregate-bitumen combination for comparison withtest values of referenced combinations.8.4.2 Apparatus:8.4.2.1 Balance, capable of weighing 1000 g sensitive to0.01 6 0.005 g.8.4.2.2 Oven, forced draft constant temperature thermostati-cally controlled at 60 6 3C. See Spe
47、cification E145 Type IIB.8.4.2.3 Suitable Heavy Gage Round Bottom Bowl, to con-tain 200 g of mixture.8.4.2.4 Suitable Mixing Spatula, or long handled metalspoon.8.4.2.5 Metal Pill Mold, consisting of a base, a case 30 mminside diameter by 70 mm height and a 29 mm diameter ram.8.4.2.6 Constant Force
48、Press, capable of exerting a constantforce of 1000 kg.8.4.2.7 Shuttle Cylinders, consisting of acrylic tubes 60 mminside diameter by 400 mm inside length containing 1100 6 25mm. Volume enclosed with water tight metal caps at each end,one of which is readily removable.8.4.2.8 Abrasion Machine, capabl
49、e of holding at least twopairs of shuttle cylinders and rotating them end for end abouta central axis at 20 rpm (see Fig. 3).8.4.2.9 Open Top 6 mm Galvanized Hardware ClothBaskets, 50 mm diameter by 50 mm high with suitable meansfor suspension in boiling water.8.4.2.10 Hot Plate, capable of heating 500 ml of water toboiling.8.4.2.11 800 ml Metal or Glass Beaker, capable of holdingboiling water.8.4.3 Preparation of Test Specimen:8.4.3.1 The aggregate to be used shall be dry sieved andregraded as prescribed (see Table 2).8.4.3.2 Weigh into the m
