Gradation Requirements: Pervious Backfill Material Sieve % Passing ¾ [150 mm]
100
No. 200 [75µm]
2 to 10
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Asphalt Materials
804.1Performance Graded Asphalt Binder
1 Provide
PGAB in accordance with the high- and low-grade temperatures specified.
804.1.1 Binder Properties 1 Provide binder in accordance with AASHTO M 320, excluding pressure aging vessel
residue tests for dynamic shear, physical hardening, and direct tension. When the difference between specified high- and low-grade temperatures is at least 90, provide binder that also is in accordance with AASHTO T 301 with at least 60 percent elongation recovery. Test at 77 °F [25 °C] using RTFO residue, and sever the specimen immediately after elongation. 2 Do not provide or use PGAB with fibers or other discrete particles larger than 0.010 in
[250 µm] or with carcinogenic modifiers. 3 Base asphalt may be modified
with no greater than 1.00 percent phosphoric acid. Ensure the total phosphorus content does not exceed 3800 ppm.
804.1.2 Authorization 1 Ensure the supplier is listed on the department’s website as an authorized supplier for
applicable grade(s) of PGAB. Information about suppliers is available on the WYDOT website. 804.1.3 Testing - Vacant
804.2Liquid Cut-Back Asphalt - Vacant
804.3Emulsified Asphalt
1 Provide and use a blend of asphalt binder, water, emulsifiers, and polymer, if specified.
When specified, polymerize using at least 3 percent polymer by weight [mass] of the asphalt binder. 2 Ensure that emulsions show no separation, such as a white/milky appearance after
mixing/stirring/agitating in tank, are smooth and homogeneous throughout, and are in accordance with the Materials Testing Manual. Provide pumpable emulsion suitable for application through a distributor without plugging or reducing flow through filters, piping, or nozzles.
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Asphalt Materials