Part 1 — General
1.1 Section Includes
A.Products and procedures for constructing a surface course of one or more layers of asphalt mix comprised of aggregate, asphalt binder, lime, and other additives for bike and pedestrian paths.
B.Mix materials at a central mixing plant.
1.2 Related Sections
A.Section 02741: Asphalt Mix
B.Section 02745: Asphalt Material
C.Section 02746: Hydrated Lime
D.Section 02748: Prime Coat/Tack Coat
1.3 References
A.AASHTO T 11: Materials Finer Than 75 µm (No. 200) Sieve In Mineral Aggregates By Washing
B.AASHTO T 19: Bulk Density (Unit Weight) and Voids in Aggregate
C.AASHTO T 27: Sieve Analysis of Fine and Coarse Aggregates
D.AASHTO T 30: Mechanical Analysis of Extracted Aggregate
E.AASHTO T 89: Determining the Liquid Limit of Soils
F.AASHTO T 90: Determining the Plastic Limit and Plasticity Index of Soils
G.AASHTO T 96: Resistance to Abrasion of Small Size Coarse Aggregate by Use of the Los Angeles Machine
H.AASHTO T 104: Soundness of Aggregate by Use of Sodium Sulfate or Magnesium Sulfate Asphalt Mix – Bike and Pedestrian Paths
I.AASHTO T 112: Clay Lumps and Friable Particles in Aggregate
J.AASHTO T 176: Plastic Fines in Graded Aggregates and Soils by Use of the Sand Equivalent Test
K.AASHTO T 209: Theoretical Maximum Specific Gravity and Density of Asphalt Mixtures
L.AASHTO T 304: Uncompacted Void Content of Fine Aggregate
M.AASHTO T 308: Determining the Asphalt Binder Content of Asphalt Mixtures by the Ignition Method
N.AASHTO T 335: Determining the Percentage of Fracture in Coarse Aggregate
O.UDOT Materials Manual of Instruction (MOI)
1.4 DEFINITIONS Not Used
1.5 Submittals
A.Mix design for verification and approval before paving according to UDOT Materials Manual of Instruction Section 960.
B.Certify, for information, that the mix meets the gradation requirements of Table 2 and that the asphalt binder requirements from the Job Mix Design. Refer to AASHTO T 30 and T 308.
Part 2 — Products
2.1 Asphalt Materials
A.Use the following asphalt materials:
1.Asphalt Binder – Performance Graded (PG) Binder.
2.Flush Coat – CQS-1, CSS-1 or SS-1.
2.2 Aggregate
A.Refer to Section 02745 and Section 02741 excluding Aggregate Properties Table.
B.Use Table 1 following for Aggregate Properties. Asphalt Mix – Bike and Pedestrian Paths Table 1 Aggregate Properties Properties Test Method Test Requirements One Fractured Face AASHTO T 335 N/A Two Fractured Face AASHTO T 335 90% Min. Fine Aggregate AASHTO T 304 45 Min. Angularity Flakiness Index MOI 933 17% Max. Based on ⅜ inch and above L.A. Wear AASHTO T 96 35% Max. Sand Equivalent AASHTO T 176, alternate 45 Min. method 2, pre-wet method (test the sample in the wet condition). Plasticity Index AASHTO T 89 and T 90 0 Unit Weight AASHTO T 19 75 lb/ft3 Min. Soundness Loss AASHTO T 104 – Sodium 16% Max. loss with five Sulfate cycles Deleterious Materials AASHTO T 112 2% Max. Natural Fines --- 10% Max.
C.Meet gradation in Table 2. Table 2 Aggregate Gradations Percent Passing by Dry Weight of Aggregate AASHTO T 11 and AASHTO T 27 Control Sieve Percent ½ inch 100.0 ⅜ inch 90.0 - 100.0 #4 < 90.0 #8 32.0 - 67.0 #200 2.0 - 10.0
2.3 Hydrated Lime
A.Use at least one percent hydrated lime.
B.Refer to Section 02746. Asphalt Mix – Bike and Pedestrian Paths
2.4 Volumetric Design Requirements
A.Perform Superpave Volumetric Mix Design according to UDOT Materials Manual of Instruction 960 and the following:
1.Incorporate hydrated lime into all designs. Refer to Section 02746.
2.Comply with Table 3.
B.The Department verifies the Volumetric Mix Design. Refer to UDOT Materials Manual of Instruction 960.
1.The Department may approve the Volumetric Mix Design from data submitted with the proposed mix design or from a previous mix design.
2.The Department reserves the right to verify any mix design submitted. Table 3 Superpave Volumetric Mix Design Compaction Number of Gyrations (N) % of Gmm (AASHTO T 209) Stage Initial 5 ≤ 91.5 Design 50 ≥ 98.5 Maximum 75 ≤ 100.0
Part 3 — Execution
3.1 Asphalt Mix
A.Refer to Section 02741, Part 3.
3.2 Surface Preparation
A.Refer to Section 02741, Part 3.
B.Refer to Section 02748.
3.3 Compaction
A.Establish a rolling pattern to obtain maximum density without over- stressing the pavement. Asphalt Mix – Bike and Pedestrian Paths
3.4 Asphalt Emulsion
A.Apply the flush coat at a uniform rate of 0.10 gal/yd2 undiluted emulsion or
0.15 gal/yd2 2:1 diluted emulsion.
1.Diluted emulsion 2:1 represents two parts undiluted emulsion and one part water. Asphalt Mix – Bike and Pedestrian Paths
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Source: Utah Standard Specifications for Road and Bridge Construction, 2027 Edition. Pages 486–490 of 1,343. View official source ↗