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' SECTION 02301 <br /> SUBGRADE <br /> 1 . DESCRIPTION <br /> A. The subgrade will be constructed such that after being compacted it will <br /> ' conform to the line, grade, and cross sections as shown on the Drawings . <br /> Shoulders shall be stabilized and compacted as specified herein for subgrades . <br /> 2 . LIMEROCK BEARING RATIO <br /> A. The subgrade shall have a minimum bearing ratio of 40 as determined by the <br /> Limerock Bearing Ratio Test. In an area where the bearing ratio is less than 40, <br /> stabilizing material approved by the Engineer shall be furnished by the <br /> Contractor, spread and mixed in accordance with Section 160-5 . 3 " Mixing " of <br /> the 1991 Edition of the Florida D . O . T. Standard Specifications for Road and <br /> Bridge Construction (FDOT Specs) . <br /> 3 . CONSTRUCTION DETAILS <br /> A. The subgrade shall be shaped, graded, and rolled to conform to the lines and <br /> grades as shown on the Drawings . Fine grading of the subgrade to its final <br /> profile shall be accomplished after the existing ground has been excavated as <br /> close as possible to the design elevations . In fill areas , fine grading of the <br /> ' subgrade shall be accomplished after fill is spread and compacted in accordance <br /> with Section 02203 of these Specifications . <br /> ' B . All drainage culverts and utility conduits which will be installed under the <br /> pavement shall be installed prior to the final shaping and compaction of the <br /> subgrade . As-built elevations shall be confirmed to meet design drawings prior to <br /> ' placement of base material . <br /> 4. COMPACTION <br /> A . The top of the subgrade in both cuts and fills shall be compacted to a <br /> minimum of 98 percent of the maximum dry density to the depth specified on the <br /> ' Plans . The required density shall be maintained until the base course has been <br /> constructed . The subgrade shall be compacted with an approved self-propelled <br /> steel drum or pneumatic tired roller weighing not less than 8 tons . All hollows <br /> ' and depressions which develop under rolling shall be filled in with suitable <br /> material . The process of grading and rolling shall be repeated until no depressions <br /> develop . After compaction, the top surface of the fine grade shall be true to line <br /> ' and grade at all locations . If the fine grade becomes rutted or displaced due to <br /> any cause whatsoever, the Contractor shall regrade it and recompact it. <br /> Ditches , drains, and swales shall be maintained along the completed <br /> ' subgrade section after their construction. <br /> C : \ D0wn1oad \ techspec - 02301 . doc 02301 - 1 <br /> 1 <br />