SECTION 303: BASE COURSE
303.1 Description
This Work consists of providing , hauling, and placing Base Cour se.
303.1.1 Stockpiling
This Work consists of providing, hauling, and stockpiling Base Course at specified locations.
303.1.2 Removing, Processing, and Placing Base Course
This Work consists of removing, hauling, processing, placing e xisting Base Course Material.
303.2 Materials
303.2.1 General
Base Course consists of one (1) or more of the following: 1. Crushed stone; 2. Crushed or screened gravel; 3. Caliche; 4. Sand; 5. Recycled Asphalt Pavement (RAP) not to exceed 50%; recycled concrete pavement (RC) not to exceed 75%; and the combined RAP and RC not to exce ed 75% by weight; 6. Processed glass aggregate. Base Course shall not contain organic matter or other Deleteri ous Materials, including silt and clay balls. The Department will allow a maxi mum of ten percent (10%) (by w eight) processed glass aggregate, uniformly distributed, in composite Base Course. Pr ocessed glass aggregate shall meet physical properties and delet erious substance requirements in accordance with AASHTO M 318.
303.2.2 Aggregate Acceptance
The Department will accept Base Course based on random samples taken by the Department from the Roadway. Unless the Contract specifies oth erwise, the Contractor shall produce Material in compliance with Table 303.2.2:1, “Type I Ba se Course Gradation Band or Table 303.2.2:2, “Type II Base Course Gradation Band” as specif ied in the Contract and Table
303.2 2:3, “Base Course Physical Properties.”
Table 303.2.2:1 Type I Base Course Gradation Band Sieve size % passing 1.0 inch 100 ¾ inch 80--100 No. 4 30-60 Type I Base Course Gradation Band Sieve size % passing No. 10 20-45 No. 200 3.0-10.0 Table 303.2.2:2 Type II Base Course Gradation Band Sieve size % passing 1.0 inch 100 ¾ inch 85-95 No. 4 40-70 No. 10 30-55 No. 200 6.0-15.0 Table 303.2.2:3 Base Course Physical Properties Property Specification Limit Fractured Facea Minimum 50% on Untreated Material AIb Maximum 35 LL Maximum 25 PI Maximum 6 aMaterials retained on or above the No. 4 sieve shall have at le ast two (2) Fractured Faces when evaluated in accordance with AASHTO T-335, “Determin ing the Percentage of Fractured Faces in Coarse Aggregate.” bMaximum AI of 35 for untreated natural aggregate source when ca lculated in accordance with Section 910, “AGGREGATE INDEX”.
303.3 Construction Requirements
303.3.1 Subgrade
The Contractor shall place base course on subgrade prepared in accordance with Section 207, "Subgrade Preparation."
303.3.2 Mixing and Placing
The Contractor shall: Place maximum six (6) inch (com pacted) lifts, unless specified otherwise. Not Place Base Course Material on frozen Subgrade. Compact Base Course to at least 96% of maximum density as dete rmined by AASHTO T 180 (Modified Proctor) , Method D (TTCP Modified). The Department will use nuclear testing methods to determine i n-place densities in accordance with AASHTO T 310 and TTCP procedures for wet densit y moisture correction.
303.3.3 Surface Tolerance
Section 303: Base Course Page 132 The surface tolerance shall not exceed ½ inch within ten (10) feet as verified by the Department. All deviations greater than ½ inch shall be correc ted by the Contractor and reverified by the Department.
303.3.4 Plan Base Course and Sub-base Depths
The Department will monitor and record Base Course depth durin g the placement in accordance with the Department’s “Minimum Testing Requirements. ” If the placed thickness deviates from the requirements by more than minus ½ inch, the C ontractor shall add Material and reprocess to correct the deficiency.
303.3.5 Stockpiled Base Course
The Contractor shall stockpile base course material at locatio ns shown on the Plans and prevent segregation of Materials at each stockpile. The Contra ctor shall maintain each stockpile in accordance with the following requirements: 1. Place stockpiles upon prepared sites; 2. Make stockpiles neat and regular to prevent segregation; 3. Provide enough storage space for each size of aggregate; 4. Prevent contamination (store s tockpiles away from vehicular and Equipment traffic); 5. Keep the storage site neat and orderly and keep the stockpil es accessible for sampling; and 6. Acceptance by the Department will be at the final stockpile location.
303.3.6 Removing and Processing Existing Base Course
The Contractor shall: 1. Minimize contamination of Base Course Material when removing it from the Roadway for reuse, and; 2. Meet the requirements as indi cated in Section 303.3.2 “Mixin g and Placing.”
303.3.7 Sampling and Testing
The Contractor and Department shall sample and test the Base C ourse in accordance with Section 906 “Minimum Testing Requirements” for Base Course . Department personnel may test locations other than the random locations generated fo r statistical analysis. These tests will not be used for pay fa ctor determination, but may be used to determine Acceptance or rejection of loc alized Material.
303.3.7 1 Contractor Quality Control
The Contractor shall develop and administer a Quality Control plan that ensures the product meets the requirements o f Section 902, "Quality Control ." The Contractor shall ensure that the Quality Control plan addresses the following elements: 1. Contractor management and process control personnel, 2. Testing Equipment and lab facilities, 3. Aggregate production, 4. Aggregate quality, 5. Stockpile management, 7. Mixing and processing, 8. Transporting, 9. Placing and spreading, 10. Compaction, 11. Line and grade control, and 12. Criteria for the correction or rejection of unsatisfactory Materials. The Contractor shall: 1. Provide copies of TTCP wallet cards or certifications for pe rsonnel who are responsible for sampling and testing the Base Course. 2. Update the list as required i f personnel substitutions are m ade. 3. Use test results, inspections, and other Quality Control pra ctices to assure the quality of each material source and to control processes for cr ushing, mixing, proportioning, processing, transpor ting, placing, spreading, an d compacting quality.
303.3.8 Acceptance
The Department will accept Base Course Materials based on samp les taken in accordance with the Section 906, “Minimum Testing Requirements” after placement but before compaction. Acceptance will be in accordance with Section 303. 2.2, “Aggregate Acceptance” and Section 303.3, “Construction Requirements. If necessary, t he Contractor shall re-work the Base Course until all requirements are met at no additional exp ense to the Department.
303.4 Method of Measurement
When calculating the square yardage the Department will use th e average Base Course width and the station-to-station length along the centerline. The dimensions will show on the typical section of the Plans. When calculating the weight of t he material, the Department will deduct the weight of moisture that exceeds the optimum moisture content plus two percent (2%). No additional payment shall be made for the stockpile pa d.
303.5 Basis of Payment
The Department will pay for the accepted quantities of Base Course as determined in Pay Item Pay Unit Base Course Cubic Yard or Ton Base Course _____inch Depth Square Yard Remove, Process and Place Base Course Square Yard or Ton Stockpiled Base Course Cubic Yard or Ton
303.5.1 Work Included in Payment
The Department will consider as included in the payment for th e pay item(s) listed in this section and will not measure or pay separately for the followin g Work: 1. Providing, hauling, placing, and compacting Base Course Mate rial; 2. Stockpiling, if required by contract; Section 303: Base Course Page 134 3. Quality Control in accordance with Section 902, “Quality Con trol;” and 4. Remove, process, and place Base Course, if required by contr act. Section 306: Portland Cement o r Lime Treated Subgrade Page 135