2017-056B - Laserfiche WebLink

Home Browse Search

1. Reclaiming The work item for Reclaimed Asphalt Base Course shall consist of pulverizing an existing bituminous pavement and its base course and mixing them together, adding water and new base material, injecting the specified stabilizing agent directly into the mixing chamber of the reclaiming machine and uniformly mixing it with the pulverized material at the rate and depth specified; and watering, shaping, grading, and compacting the blended material to produce a stabilized base course, true to the established line and grade of the road. The Contractor will be required to perform reclaiming work while traffic is maintained in another lane or lanes of the road. The work item for Reclaimed Asphalt Base Course shall include all necessary traffic control services provided during the reclaiming operation which are not covered under other work items in the Contract. All traffic control and maintenance of traffic is to be performed in conformity with Agency standards with Roadway and Traffic Design Standards, published by the Florida DOT, and with the Manual for Traffic Control Devices, published by the U.S. Department of Transportation. 2. Materials a. References: the abbreviated title, "FDOT Specifications," used herein refers to the Standard Specifications for Road and Bridge Construction 2015, of the Florida Department of Transportation. b. Stabilizing Agent: Stabilizing agent shall consist of emulsified asphalt, type CSS -1 h, meeting the requirements of ASTM D2397-98 and shall be injected in the base material. c. Asphalt Emulsion mix design: Asphalt emulsion is to be used as the stabilizing agent. The Contractor shall obtain a mix design study based on the material in the existing layers. Prior to scheduling the work, the Contractor shall obtain the services of an independent laboratory which shall sample the pavement, base, subgrade and shall perform a modified Marshall Stability Test and a recommendation as the depth of mixing and the rate and depth of emulsion treatment. The Reclaimed Asphalt Base Course shall have a minimum Structural Number (SN) of 1.8 for the total thickness of the finished/completed base course. The Contractor shall be responsible for preparing Mix Designs for the Reclaimed Asphalt Base Course prior to the start of construction. The Contractor will also be required to test the completed base course and provide test results that verify that the completed base course meets the specified Structural Number. All Mix Design testing/preparation and testing for verification of the Structural Number shall be performed by an independent testing laboratory and all costs associated with the Mix Design preparation and SN verification testing shall be the responsibility of the Contractor. The assumed Project Mix Design is based on a mixture of 9" of reclaimed asphalt and limerock or cemented coquina base and 2.75 gallons/SY of CSS -1 H Emulsified Asphalt. The target Mix Design shall have a minimum Asphalt Structural Number (SN) of 0.20 per inch. The Mixture used in the work shall be as determined by the project specific Mix Design Testing. The Testing Laboratory preparing the Reclaimed Asphalt Base Course Mix Designs and SN verification testing shall be an accredited laboratory that is regularly engaged in asphalt testing including the preparation of Mix Designs for Cold Recycled Bituminous Base Course or Reclaimed Asphalt Base Course, and testing to establish and verify Structural Number for asphalt base course layers. The Contractor shall provide 01025-25 Technical Specifications F\Public Works\ENGINEERING DIVISION PROJECTS\1139-CR 512 Wbnd Resurfacing -Roseland Rd to US 1-SCOP\Admin\bid documents\Master Contract Documents\Technical Specifications REVISED.doc