Section 02232 Limerock Base - Laserfiche WebLink

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02232 - 2/2 PART 2 - PRODUCTS 2.01 LIMEROCK BASE: The CONTRACTOR shall provide new limerock conforming to FDOT Standard Specifications for Road and Bridge Construction SECTION 911. The minimum acceptable density of limerock shall be 120 lbs./cu. ft. PART 3 - EXECUTION 3.01 BASE PREPARATION: The CONTRACTOR shall prepare the existing base by scarifying and disking to a depth of not less than 6 inches for the full width of the proposed base. The base shall be loosened to such an extent that no pieces larger than 3-1/2 inches in the greatest dimension remain bonded together. All unsuitable base materials such as organic matter, muck, roots, brush, or other material that will not compact into a suitable and enduring roadbed shall be removed and disposed off-site. 3.02 REMOVAL OF ASPHALTIC SURFACES: The CONTRACTOR shall remove all asphaltic concrete surfaces prior to scarifying of the existing rock base. All such materials shall be disposed of off-site in areas provided by the CONTRACTOR, unless other disposal is shown on the plans. 3.03 SPREADING AND SHAPING: The CONTRACTOR shall spread existing base materials to the full width of the proposed new base course and to a grade and cross section roughly parallel to the finished grade. Limerock shall be added as necessary to bring the proposed base to the grades required on the Drawings. 3.04 COMPACTING AND FINISHING BASE: The CONTRACTOR shall compact by rolling with either the grid-type roller or the sheep’s foot roller, properly weighted, after the spreading and mixing operations are complete. The material being compacted shall be maintained within plus or minus 2 percent of its optimum moisture content during compaction. Final rolling shall be accomplished with traffic rollers. The base shall be compacted to not less than 98 percent of the maximum density as determined by ASTM D1557-00, and in accordance with FDOT Standard Specifications for Road and Bridge Construction Section 200. 3.05 PRIMING AND MAINTAINING: The CONTRACTOR shall apply prime coat only when the base meets the specified density requirements and the moisture content in the top half of the base does not exceed 90 percent of the optimum moisture of the base material. At the time of priming, the base shall be firm, unyielding and in such condition that no undue distortion will occur. The CONTRACTOR shall be responsible for assuring that the true crown and template are maintained, with no rutting or other distortion, and that the base meets all the requirements at the time the surface course is applied. END OF SECTION