Title : BACKFILL WORKS.
Subject : Procedure for the backfill work.
Reference : 1 Project Quality Plan
2 Standard National Indonesia ( SNI)
General.
The work procedure as given are to be applied for the handling of the backfilling to the extent necessary to conform with the finished grades, cross sections and dimensions as shown on the drawings. All timbering and debris shall be removed before backfill is placed.
Generally soil shall be used for bacfilling, except for the top 300 mm layer of a backfill around exterior walls and foundations where also non-gtanular materials such as silt and clay may be used. Spaces not occupied by permanent works shall be refilled to the surface of the surrounding ground or as per level indicated on the drawings before being compacted and neatly graded.
No backfill shall be placed againts any foundation or wall until 21 days after placing the concrete, or until the wall gained sufficient strength to support the imposed load.
Method of Compaction.,
Soil shall be spread in solid laters of 300 mm at near to optimum moisture conytent and compacted to achieve a minimum 0f 90 % of the standard compaction as reccording to the Proctor Density Test.
Compaction shall whwnever possible performed by mechanical means through motorized stampers otherwise manual hand stampers will be used,
Levelling of Final Grading.
The surface of grading shall be graded as per required levels on the drawings . Any settlement below the designed finish grading shall be made good.
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