Pikes Peak Region Asphalt Paving Specifications Version 5 March 20, 2019 Pikes Peak Region Asphalt Paving Specifications Contents 1. General Description ............................................................................................................ 1 2. Materials .............................................................................................................................. 1 A. Aggregates .................................................................................................................. 1 B. Mineral Filler ................................................................................................................ 2 C. Additives. ..................................................................................................................... 3 1. Hydrated Lime ......................................................................................................... 3 2. Anti-stripping Agent .................................................................................................. 3 3. Warm Mix Asphalt (WMA) and Compaction Aids ..................................................... 3 D. Reclaimed Asphalt Pavement ...................................................................................... 3 E. Asphalt Binder ............................................................................................................. 3 1. Mixture Binder Selection .......................................................................................... 4 2. Tack Coat Material Requirements ............................................................................ 5 F. Material Acceptance .................................................................................................... 5 3. Asphalt Pavement Material Mixture Composition............................................................. 5 A. Mix Design .................................................................................................................. 5 B. Plant Mix Production Verification ................................................................................. 6 4. Asphalt Pavement Material Pavement Construction ........................................................ 7 A. Pre-paving Meeting ..................................................................................................... 7 B. Paving Schedule ......................................................................................................... 7 C. Weather Restrictions ................................................................................................... 7 D. APM Production Facilities ............................................................................................ 8 1. Scales ...................................................................................................................... 8 2. Inspection of Plant ................................................................................................... 8 3. Storage Bins and Surge Bins ................................................................................... 8 E. Hauling Equipment ...................................................................................................... 8 F. Placement Equipment ................................................................................................. 9 G. Compaction Equipment ............................................................................................... 9 H. Asphalt Pavement Material Mixture Production ........................................................... 9 1. Preparation of the Asphalt Binder ............................................................................ 9 2. Preparation of the Aggregate ................................................................................... 9 3. Preparation of the Asphalt Pavement Material Mixture ........................................... 10 I. Warm Mix Asphalt Production ................................................................................... 10 J. Preparation of the Underlying Surface. (Subgrade, Milled, Full Depth Reclamation, etc.) .................................................................................................................................. 11 K. Tack Coat .................................................................................................................. 11 L. Patching .................................................................................................................... 12 M. Hauling of APM ......................................................................................................... 12 N. Placing of APM .......................................................................................................... 12 1. Segregation ........................................................................................................... 13 2. Lift Thickness ......................................................................................................... 14 3. Joint Construction .................................................................................................. 14 4. Compaction ............................................................................................................ 16 O. Testing and Inspection .............................................................................................. 16 1. Quality Control (QC) .............................................................................................. 16 2. Quality Assurance (QA) ......................................................................................... 17 3. Testing Responsibilities ......................................................................................... 18 4. Testing Frequencies and Tolerances ..................................................................... 19 5. Contractors’ Quality Control Program ..................................................................... 23 P. Method of Measurement ............................................................................................ 24 Q. Basis of Payment ...................................................................................................... 24 Index of Tables ................................................................................................................... 25 Appendix A – Pre-Paving Conference Agenda .................................................................................. 26 Appendix B – Mix Design Requirements ............................................................................................ 31 Pikes Peak Region Asphalt Paving Specifications 1. General Description These specifications cover the requirements for the construction of Superpave Asphalt Pavement Material (APM). They include the general requirements for the construction of one or more lifts of APM on a prepared surface. The work shall consist of the preparation of the APM meeting the requirements herein, and the placement of the APM to the lines, grades, thickness and typical cross sections shown on the plans or established by the Owning Agency Engineer. When more than one lift is required, each lift shall be compacted to the required density prior the placement of the next lift. In these specifications the following terminology listed in Table 1.01 defines the traffic and volume levels for the different designations. Table 1.01 - Traffic and Volume Designation Designation Volume and Loading Level Low ≤ 300,000 ESALs * Moderate > 300,000 to ≤ 2,500,000 ESALs High > 2,500,000 ESALs < 100,000 ESALs - able to accommodate a 4,000 lb vehicle Trails and Pathways for safety and maintenance purposes Parking Lots 25% of volume used for entrance roadways * Equivalent Single-Axle Loads 2. Materials The APM shall be a mixture of aggregate, approved filler or additives, asphalt binder and may include reclaimed asphalt pavement (RAP). The materials used in the manufacture of APM shall meet the following requirements. A. Aggregates Aggregates shall be of uniform quality, clean, hard, durable particles of crushed stone, crushed gravel, natural gravel or crushed slag free from clay balls, vegetable matter, or other deleterious materials meeting the requirements in Table 2.01. The coarse and fine aggregates for the APM shall be graded and combined in such proportions, the resulting composite blend meets the grading requirements of the job mix formula (JMF). The following Table 2.02 is for identification of material for bidding purposes only. Aggregates meeting the requirements in Table 2.01 shall be used to develop the JMF for the APM. The aggregate shall be composed of clean angular, coarse textured, and comprised of two or more fractured faces. Natural sand may be used to obtain gradation of the blended aggregate mixture but should not exceed 25 percent of the aggregate. If the percent of aggregate passing the #4 sieve is greater than 10 percent by weight of the individual aggregate sample, plasticity will be determined in accordance with AASHTO T 90. The gradation of the aggregates used in the mixture shall meet the criteria shown in the Aggregate Master Range, Table 2.02, and shall not vary from the lower limit on one sieve to the higher limit on the adjacent sieve, or vice versa, but shall be well graded from coarse to 1 fine. The nominal size aggregate used in the APM shall not be more than one-third the thickness of the un-compacted APM lift being constructed. TABLE 2.01 - AGGREGATE PROPERTIES Coarse Fine Property Test Procedure Retained