2014-129A - Laserfiche WebLink

Home Browse Search

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 -1H 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 information for proposed testing laboratories and mix designs shall be subject to the approval of the County. The Mix Design study and recommendations shall be forwarded to the County at least five work days prior to starting operation. d. Granular base material: Granular base material to be added to the reclaimed layers shall consist of limerock meeting the requirements for Limerock Stabilized Base of the FDOT Specifications, Section 911. Further, it shall have a minimum LBR value of 100. 3. Equipment a. General: The Contractor shall accomplish the work utilizing a road reclaimer, a motor grader, a vibratory roller or three -wheeled roller, a water truck with spray bar and such additional equipment as may be necessary to the operation. The required equipment shall be subject to the County's approval, and the County may, at any time during the work, disapprove the use of a particular machine for unsafe, erratic, or inadequate performance. Utilization of a proper road reclaimer and compaction equipment as specified herein is essential to this work, and substitution of other equipment or a different technique shall not be acceptable. b. Reclaimer: The work shall be performed utilizing a road reclaimer machine originally designed for pavement reclaiming. The road reclaimer shall be a CAT 350, larger or a comparable model of equal or greater horsepower and rotor size, produced by another manufacturer. The reclaimer shall be capable of pulverizing and mixing pavement, base materials, and subgrade soil to depth of 16 inches. It shall be capable of injecting asphalt emulsion into the rotor chamber at an accurately controlled rate and of doing so in confined areas inaccessible to a tanker truck. c. Compacting equipment: The Contractor shall compact the reclaimed base material with a vibratory roller weighing not Tess than 13,000 lbs. or by a three wheeled roller weighing not less than 11 tons. The vibrator must be fully operable at maximum amplitude throughout the compacting process. 4. Construction Procedure a. General: When the work is to be performed under traffic, each lane shall be completed in segments, the lengths and limits of which shall be approved by the County. The County may limit the length of the work zone to avoid causing a traffic hazard or undue delay. Before commencing the reclaiming operations, the Contractor shall set alignment stakes (laths) at intervals of 200 feet or Tess on both sides of the road, offset at least 4 feet from the proposed edge of pavement for use in preparing the base and placing the new pavement. The setting of laths shall be in addition to any 01025-29 Technical Specifications F:\Public Works\ENGINEERING DIVISION PROJECTS\1137-OId Dixie Hwy Resurfacing IRF North Relief Canal to 71st St\Admim\Addendums\Technical Specifications ADDENDUM 1 07-31-2014.doc