Fill material shall be compacted as soon as practicable after deposition. Following the development of approved methods and plant, satisfactory completion of the compaction trials, the placement and compaction of the fiII shall commence in accordance with the agreed methods. Compaction shall be undertaken in accordance with the minimum requirements of 95% standard density at optimum moisture content as determined by the Modified Proctor test and as approved by the Employer.Water used for compaction of fill material shall be reasonably free of salts, oils, acids, alkalis, organic matter, or other deleterious substances.When the fill type and its proposed method of laying have been approved by the Employer this method shall be used for the actual filling operations. No changes in material properties, its source of supply or placement method shall be allowed without the Employer’s approval and further compaction trials where necessary. Fill shall generally be placed in layers not exceeding 200mm maximum loose thickness. In small and narrow areas, i.e. trenches for services, etc., fill layers shall not exceed 150mm loose thick.Each layer of rockfill embankments shall be compacted by at least 12 passes of a towed vibratory roller with a static mass per meter width of roll at least 1800kg or a grid roller with a mass per metre width or roll of at least 8000kg or other approved plant. Earthmoving plant shall not be accepted as compaction equipment.
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