APPENDIX A8 - wictg.co.uk

Specification for the reinstatement of Openings in Highways Second Edition112 APPENDIX A8 Compaction Granular, Cohesive and Cement Bound MaterialsAll graded granular, granular, cohesive/granular, cohesive and cement bound materials laidabove the surround to apparatus shall be compacted in accordance with Table Chalk MaterialsAll chalk materials, including medium and high-density chalks shall be compacted inaccordance with Table However, if the chalk is unstable after compaction, theunstable material shall be removed and replaced with fresh material. Fresh chalk shall becompacted in accordance with Table , except that the specified number of compactionpasses shall be reduced by one pass. If the chalk is still unstable after compaction, it shallbe deemed to be unsuitable for use as backfill and replaced with suitable Requirements for Granular, Cohesive and Cement BoundMaterialsCohesive MaterialGranular MaterialCompaction Plant(less than 20% granular content)(20% or more granular contentandincluding cement bound material)Weight CategoryMinimum Passes/LiftMinimum Passes/Liftfor compacted lift thickness up tofor compacted lift thickness up to100 mm150 mm200 mm100 mm150 mm 200 mmVibrotamper50 kg minimum48 #NP48 NPVibrating RollerSingle Drum1000-2000 kg/m8 NPNP6 NPNP2000-3500 kg/m

Specification for the Reinstatement of Openings in Highways – Second Edition 112 APPENDIX A8 Compaction Requirements A8.1 Granular, Cohesive and Cement Bound Materials

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