ASTM D6372-05(2010)
(Practice)Standard Practice for Design, Testing, and Construction of Micro-Surfacing
Standard Practice for Design, Testing, and Construction of Micro-Surfacing
SIGNIFICANCE AND USE
This micro-surfacing practice is written as a guide and should not be construed as a specification. End use specifications should be adapted to conform to job and user requirements.
SCOPE
1.1 This practice covers the design, testing, and construction of mixtures of polymer modified asphalt emulsion, mineral aggregate, mineral filler, water, and other additives, properly proportioned, mixed and spread on a paved surface. It is written as a guide and should be used as such. End use specifications should be adapted to conform to job and user requirements.
Note 1—This practice references test methods outside the jurisdiction of ASTM that may or may not have a precision statement.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D6372 −05(Reapproved 2010)
Standard Practice for
Design, Testing, and Construction of Micro-Surfacing
This standard is issued under the fixed designation D6372; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 ISSA Documents:
ISSATechnicalBulletinNo.100,TestMethodforWetTrack
1.1 Thispracticecoversthedesign,testing,andconstruction
Abrasion of Slurry Surfaces
of mixtures of polymer modified asphalt emulsion, mineral
ISSATechnical Bulletin No. 109,Test Method for Measure-
aggregate, mineral filler, water, and other additives, properly
mentofExcessAsphaltinBituminousMixturesbyUseof
proportioned, mixed and spread on a paved surface. It is
a Loaded Wheel Tester and Sand Adhesion
written as a guide and should be used as such. End use
ISSATechnical Bulletin No. 139, Test Method to Classify
specifications should be adapted to conform to job and user
EmulsifiedAsphalt/Aggregate Mixture Systems by Modi-
requirements.
fied Cohesion Tester, Measurement of Set and Cure
NOTE 1—This practice references test methods outside the jurisdiction 3
Characteristics
of ASTM that may or may not have a precision statement.
ISSAA143 Revised May 2003 Recommended Performance
1.2 The values stated in SI units are to be regarded as the
Guidelines For Micro-Surfacing
standard.
ISSATechnical Bulletin No. 144, Test Method for Classifi-
cation of Aggregate Filler—Bitumen Compatability by
1.3 This standard does not purport to address all of the
Schultze-Breuer and Ruck Procedures
safety concerns, if any, associated with its use. It is the
ISSATechnical Bulletin No. 147, Test Methods for Mea-
responsibility of the user of this standard to establish appro-
surements of Stability and Resistance to Compaction,
priate safety and health practices and determine the applica-
Vertical and Lateral Displacement of Multilayered Fine
bility of regulatory limitations prior to use.
Aggregate Cold Mixes
2. Referenced Documents
3. Terminology
2.1 ASTM Standards:
3.1 Definitions of Terms Specific to This Standard:
C88Test Method for Soundness of Aggregates by Use of
3.1.1 polymer modified emulsified asphalt micro-surfacing
Sodium Sulfate or Magnesium Sulfate
mixtures—asrelatedtothispractice,mixturesoffineaggregate
C131Test Method for Resistance to Degradation of Small-
with mineral filler, mixing water, and field control additive,
Size CoarseAggregate byAbrasion and Impact in the Los
uniformly mixed with polymer modified emulsified asphalt.
Angeles Machine
4. Summary of Practice
D2397Specification for Cationic Emulsified Asphalt
D2419Test Method for Sand Equivalent Value of Soils and
4.1 This practice outlines the basic properties for materials,
Fine Aggregate
mix design procedures, and application techniques for the
D3910Practices for Design, Testing, and Construction of
design and application of micro-surfacing. The mix developed
Slurry Seal
through this practice should be capable of being spread in
E145Specification for Gravity-Convection and Forced-
variable thick cross sections, which after curing and initial
Ventilation Ovens
traffic consolidation, resist compaction through the entire
design tolerance range of bitumen content and variable thick-
nesstobeencountered.Theendproductshouldmaintainahigh
friction surface and variable thick sections throughout its
This practice is under the jurisdiction ofASTM Committee D04 on Road and
Paving Materials and is the direct responsibility of Subcommittee D04.24 on
surface life. The mix should be a quick traffic system and
Bituminous Surface Treatments.
should be able to accept rolling traffic on a 12.7 mm thick
Current edition approved Dec. 1, 2010. Published December 2010. Originally
surface within 1 h after placement in 24°C temperature and
approved in 1999. Last previous edition approved in 1999 as D6372–05. DOI:
50% or less humidity.
10.1520/D6372-05R10.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from International Slurry Surfacing Association, 3 Church Circle,
the ASTM website. PMB 250, Annapolis, MD 21401.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6372−05 (2010)
5. Significance and Use trafficona12.7mmthicksurfacewithin1hafterplacementat
24°Ctemperatureand50%orlesshumidity.Themixtureshall
5.1 This micro-surfacing practice is written as a guide and
conformtooneofthegradationtypeslistedinTable1.TypeII
should not be construed as a specification. End use specifica-
issuitableforurbanandresidentialstreetsandairportrunways.
tions should be adapted to conform to job and user require-
It shall be applied at the minimum rate of 5.4 to 8.1 kg/m .
ments.
Type III is suitable for primary and interstate routes and to fill
wheel ruts. It shall be applied at the rate of 8.1 to 16.2 kg/m .
6. Design
forprimaryandinterstateroutes.Theapplicationforwheelruts
6.1 Aggregates—The aggregate shall be a manufactured
shall be as prescribed in Appendix X1.
crushed stone such as granite, slag, limestone, chat, or other
high quality aggregate or combination thereof. The aggregate
8. Test Procedures For Mix Design of Polymer Modified
shall be totally crushed with 100% of the parent aggregate
Emulsified Asphalt Micro-Surfacing Systems
being larger than the largest stone in the gradation to be used.
8.1 Cohesion Test:
Recommended grading requirements are shown in Table 1.
8.1.1 This test procedure is used to determine various set
When tested by Test Method D2419, the combined aggregate
times of the micro surfacing mixture. It measures torque of a
prior to the addition of any chemically active mineral filler
microsurfacing mixture as it coalesces and develops cohesive
shallhaveasandequivalentofnotlessthan65.Whentestedby
strength. The amount of torque developed plotted over time
Test Method C88 the aggregate shall have a weighed average
shows how the mixture is developing resistance to movement.
loss not greater than 15% using sodium sulfate or 25% using
Specific torque and time values are defined as “set time” and
magnesium sulfate. Testing by Test Method C131 shall show
“early rolling traffic time” (see Fig. 1).
an abrasion resistance of 30% maximum.
8.1.2 Set time is defined as the lapsed time after casting a
6.2 Mineral Filler—Mineral filler shall be any recognized
specimen of the microsurfacing mixture that it cannot be
brand of nonairentrained portland cement or hydrated lime.
remixed homogeneously (there is no free emulsion to lubricate
The mineral filler shall be free of lumps and accepted upon
the system) and no lateral displacement is possible when it is
visualinspection.Thetypeandamountofmineralfillerneeded
compacted. It is further defined as the time when there are no
shall be determined by a laboratory mix design and will be
signs of free emulsion when pressed with an absorptive paper
considered as part of the aggregate gradation.
towel and there is no free emulsion diluted and washed away
6.3 Emulsified Asphalt—The emulsified asphalt shall be a when rinsed with water.
8.1.3 Earlyrollingtraffictimeisdefinedasthetimeatwhich
quicksetpolymermodifiedasphaltemulsionconformingtothe
requirements of Specification D2397 for CSS-1h or section the micro-surfacing mixture will accept rolling traffic without
picking or deformation.
377, SSIA. The polymer material shall be milled or blended
into the asphalt or emulsifier solution prior to the emulsifica- 8.1.4 Set times for the micro-surfacing mixture shall be
determined as outlined in 6.3 of Practice D3910.
tion process. The cement mixing test shall be waived for this
emulsion.Thefivedaysettlementtestmaybewaived.Referto
NOTE 2—Referenced ISSATechnical Bulletin No. 139.
ISSA Document A143.
8.2 Wet Track Abrasion Test:
8.2.1 This test procedure is used to determine the minimum
7. Composition of Micro-Surfacing Mixtures
asphalt content and resistance to stripping.
7.1 A job mixture shall be selected that conforms to the
specificationsforaquicktrafficsystem,meaningthatitwillbe
able to accept traffic after a short period of time and is capable
ofbeingspreadinvariablecrosssections,wedges,ruts,scratch
courses, and surfaces and that after curing and initial traffic
consolidation resists compaction throughout the entire design
tolerancerangeofbitumencontentandvariablethicknesstobe
encountered. The mixture should maintain a high friction
surface, and variable thick sections throughout the service life
of the mixture. The mixture shall be able to accept rolling
TABLE 1 Grading Requirements
Type II Percent Type III Percent
Sieve Size Stockpile Tolerance
Passing Passing
9.5 mm 100 100
4.75 mm 90 to 100 70 to 90 ± 5 %
2.36 mm 65 to 90 45 to 70 ± 5 %
1.18 mm 45 to 70 28 to 50 ± 5 %
600 µm 30 to 50 19 to 34 ± 5 %
330 µm 18 to 30 12 to 25 ± 4 %
150 µm 10 to 21 7 to 18 ± 3 %
75 µm 5 to 15 5 to 15 ± 2 % FIG. 1Classification of Mix Systems by Modified Cohesion Test
Curves
D6372−05 (2010)
8.2.2 It establishes the minimum permissible emulsion con- 8.3 Loaded Wheel Test—This test procedure measures the
tent of a given micro-surfacing system and the long term amount of compaction and displacement characteristics of
moisture susceptibility of the system.
multi-layered micro-surfacing mixtures under simulated roll-
8.2.3 The test shall be run in accordance with Practice
ing traffic compaction (see Fig. 2).
D3910, Section 6.4.
8.3.1 Summary of Test Procedure:
NOTE 3—Referenced ISSATechnical Bulletin No. 100.
FIG. 2Loaded Wheel Tester
D6372−05 (2010)
8.3.1.1 A 500 g dry aggregate weight mixture is prepared 8.3.3.4 After cooling for2hto room temperature, measure
using 0/#4 or other gradation aggregate and the desired the specimen with the calipers for net lateral thickness.
quantitiesoffillers,wateradditivesandasphaltemulsion.After
8.3.3.5 Then mount the specimen in the loaded wheel tester
30 s of vigorous mixing, the mixture is cast into 12.7 by 50.8
machine and subject it to 1000 cycles of compaction at a
mm by 38.1 cm mold centered over a 0.60 mm mounting plate
temperature of 226 2°C.
and immediately struck-off uniformly with a wooden dowel or
8.3.3.6 Then remove the specimen from the loaded wheel
U shaped wooden screed using a sawing action. The inside
tester machine and immediately remeasure laterally.
surfaces of the mold may be coated with a thin coating of
8.3.3.7 Reference Document ISSA Technical Bulletin No.
petroleum or a mixture of glycerin and talc as a mold release
147.
to prevent sticking.
8.4 Classification Test—This test procedure covers the de-
8.3.1.2 As soon as the mixture is sufficiently set to prevent
termination of the relative compatibility between aggregate
free flow, the mold is carefully removed without disturbing the
filler of specific gradation and emulsified asphalt residue.
specimen. The specimen is air cured for 24 h, then dried to a
8.4.1 Summary of Test Procedure—The test procedure pro-
constant weight in a forced draft oven at 60°C for 18 to 20 h.
vides a rating system or grading values for abrasion loss,
After cooling, the specimen is measured centrally for width
adhesion, and high temperature cohesion characteristics of a
and net thickness. The net weight of the specimen is obtained
specified aggregate-bitumen combination for comparison with
and recorded. The specimen is then mounted in the loaded
test values of referenced combinations.
wheel track machine and subjected to 1000, 56.7 kg cycles of
8.4.2 Apparatus:
compaction. The specimen is then removed and immediately
8.4.2.1 Balance, capable of weighing 1000 g sensitive to
remeasuredlaterallyinthewheelpathandtheresultsrecorded.
0.01 6 0.005 g.
Thelateraldisplacementisexpressedasthepercentincreaseof
8.4.2.2 Oven,forceddraftconstanttemperaturethermostati-
the original width. The specific gravity should be expressed as
callycontrolledat60 63°C.SeeSpecificationE145TypeIIB.
the increase by percent after compaction of the specimen.
8.4.2.3 Suitable Heavy Gage Round Bottom Bowl, to con-
8.3.2 Apparatus:
tain 200 g of mixture.
8.3.2.1 Balance, capable of weighing 2000 g or more to
8.4.2.4 Suitable Mixing Spatula, or long handled metal
within 6 1.0 g.
spoon.
8.3.2.2 Loaded Wheel Tester, (as described in ISSATB109)
8.4.2.5 Metal Pill Mold, consisting of a base, a case 30 mm
consistingofa7.62cmdiametersoftrubberwheelloadedwith
inside diameter by 70 mm height and a 29 mm diameter ram.
56.7 kg which reciprocates through a 30.48 cm horizontal path
8.4.2.6 Constant Force Press,capableofexertingaconstant
at the rate of 44 cycles per minute.
force of 1000 kg.
8.3.2.3 Suitable Heavy Gage Round Bottom Bowl, suitable
8.4.2.7 Shuttle Cylinders,consistingofacrylictubes16mm
to prepare 500 gram mixes.
insidediameterby400mminsidelengthcontaining1100 625
8.3.2.4 Long Handled Steel Spoon, or suitable spatula for
mm.Volume enclosed with water tight metal caps at each end,
mixing of aggregate emulsion mixtures.
one of which is readily removable.
8.3.2.5 Specimen Mounting Plate, (0.60 mm galvanized
8.4.2.8 Abrasion Machine, capable of holding at least two
steel 7.62 by 40.6 cm, deburred).
pairs of shuttle cylinders and rotating them end for end about
8.3.2.6 Specimen Mold, 12.7 mm thick by 76.2 mm × 40.6
a central axis at 20 rpm (see Fig. 3).
cm outside and 50.8 mm by 38.1 cm inside dimensions.
8.4.2.9 Open Top 6 mm Galvanized Hardware Cloth
8.3.2.7 Calipers, capable of measuring specimen width to
Baskets, 50 mm diameter by 50 mm high with suitable means
within 0.01 mm.
for suspension in boiling water.
8.3.2.8 Oven,forceddraftconstanttemperaturethermostati-
8.4.2.10 Hot Plate, capable of heating 500 ml of water to
cally controlled at 60 6 3°C. See specification E145Type IIB.
boiling.
8.3.3 Preparation of Test Specimen:
8.4.2.11 800 ml Metal or Glass Beaker, capable of holding
boiling water.
8.3.3.1 A 500 gram dry weight aggregate mixture is pre-
pared using the 4.75 mm and smaller fractions, the desired
8.4.3 Preparation of Test Specimen:
quantities of fillers, water additives, and asphalt emulsion.
8.4.3.1 The aggregate to be used shall be dry sieved and
8.3.3.2 After 30 s of vigorous mixing, cast the mixture into regraded as prescribed (see Table 2).
the mold, centered over the 0.60 mm mounting plate and
8.4.3.2 Weigh into the mixing bowl 200 g of the prepared
immediately struck-off uniformly with a wooden dowel or U aggregate,2gT
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