923 SLURRY SEAL MICRO-SURFACING

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923.01 AGGREGATES.
Aggregates shall be crushed stone, compatible with the emulsion, and meet the gradation requirements in D 3910 or D 6372. Aggregates shall also meet the physical requirements for Slurry Seal (SS) and Micro-surfacing (MS) in Table 901 D.
923.02 MINERAL FILLER.
901.01.
923.03 WATER.
921.01.
923.04 EMULSIFIED ASPHALT.
Emulsified asphalt shall be neat or polymer modified. The polymer shall be milled or blended into the asphalt or emulsifier solution prior to the emulsification process. The polymer modified emulsion shall contain 3.0 percent polymer solids minimum by weight of asphalt. The emulsified asphalt shall meet M 208, Grade CSS-1h or CQS-1h. Each load of emulsified asphalt shall be accompanied by a Certificate of Analysis/Compliance that indicates the emulsion meets specification requirements.
923.05 MIX DESIGN APPROVAL.
Submit mix design data for approval at least three weeks in advance of the paving operation. Include the following:
(a) Source, percentage, and grade of emulsified asphalt.
(b) Source, gradation and proportion of each component aggregate.
(c) Source and percentage of additional additives.
(d) Target gradation and residual asphalt content of mix.
(e) Mix design worksheets.
Test the mix design in accordance with D 3910 or D 6372. The mix design report shall show that the test results meet the following:
Slurry Seal
TEST PROPERTY TEST

METHOD

SPECIFICATION

LIMITS

Consistency Test (Mix Time), 77F, s, maximum D 3910 180
Set Time, 77F, m, minimum D 3910 15
Wet Track Abrasion, g/ft2, max

One-hour soak

*ISSA TB-100 75
Residual Asphalt: Type II T 164 or T 308 7.5 – 13.5%
Type III T 164 or T 308 6.5 – 12.0%
Micro-Surfacing
TEST PROPERTY TEST

METHOD

SPECIFICATION

LIMITS

Set Time 77F s, minimum D 6372 30
Wet Track Abrasion, g/ft2, maximum

One-hour soak

*ISSA TB-100 50
Residual Asphalt (by dry weight of aggregates): Type II or Type III T 164 or T 308 5.5 – 10.5%
*International Slurry Seal Association