Laserfiche WebLink
Be If the natural soils are acceptable for subgrade material , but do not meet the <br /> required stability, approved stabilizing material may be brought in and uniformly <br /> mixed with the existing material to the depths shown on the Contract Drawings to <br /> produce the required bearing values , in accordance with Section 160-5 . 3 " Mixing" of <br /> the DOT Specifications for Road and Bridge Construction . <br /> ' C . The required density and cross section of the subgrade shall be maintained until the <br /> base has been laid . If the final grade becomes rutted or displaced , regardless of <br /> 1 the reason , re-grade and re-compact it at no additional expense to the OWNER . All <br /> ditches , drains , and swales shall be maintained along the completed subgrade <br /> section after their construction . <br /> D . All drainage culverts , conduits , water and sewer lines , and all other construction to <br /> be placed under the pavement shall be installed before the final shaping and <br /> compaction of the subgrade . <br /> 3 . 2 COMPACTION <br /> A. FLORIDA BEARING VALUE - Unless otherwise specified or shown on the Plans <br /> the stabilized subgrade shall have a minimum Florida Bearing Value of 50 . <br /> Be The subgrade shall be shaped to within 1 /4 inch of the cross section rade shown <br /> 9 P g <br /> on the Contract Drawings prior to taking density tests . Work shall not proceed until <br /> all required density tests have passed . <br /> C . All subgrade shall be compacted to minimum 98 percent of the maximum dry <br /> density per AASHTO T- 180 . <br /> D . Compaction shall be accomplished with a self- propelled steel drum or pneumatic <br /> tired roller weighing at least 8 tons . Fill all hollows or depressions forming due to <br /> rolling with appropriate suitable material . Repeat grading and rolling until <br /> depressions no longer develop . <br /> 3 . 2 COMPACTION TESTS <br /> ' A . Take compaction tests at the locations specified herein or at locations selected by <br /> the ENGINEER or his authorized representative . <br /> jBe As a minimum , Florida Bearing Value tests shall be taken at 200 linear foot <br /> intervals . <br /> jC . Density tests ( Modified Proctor Test) perAASHTO T- 180 shall be taken at minimum <br /> 200 linear foot intervals . Each subgrade material which is inherently different in <br /> Last revised 7/25/02 02510-2 EAST GIFFORD <br /> F:\Public worksweithmstorm ester Projects\Gfford East\construction contracnechnical Specifications\Final SpeciticationsUivision <br /> 2\02510 - Stabilized Subgrade.doc <br /> 1 <br />