Raw Materials, their Inspection and Acceptance Criteria
A) Soil used for backfilling:
1) Murrum: - Murrum for backfilling shall be freshly excavated, free from vegetation, boulders, silt and clay. Murrum can be either hard or soft.
2) Sand: sand for backfilling shall be of medium size, hard, free from organic and other deleterious materials, silt and clay.
3) Rubble: - Rubble for soling shall be hard, tough, and durable. It shall be regular in shape and of size of about 200 to 230 mm.
1) All backfill material other than rubble shall be free from roots, grass and rubbish. It shall be reasonably well graded and of maximum size 80 mm. All lumps and clods of size larger than 80 mm shall be broken down using wooden mallet.
2) Material brought from outside sources shall be approved by Quality Engineer at the place of source and shall be visually checked each time during its delivery and unloading at site throughout the period of backfilling work.
3) Backfill material (Murrum and rubble) shall be tested in laboratory at time of approval from source.
4) Change in source of materials shall be avoided. If unavoidable, the new sample and the source shall be again approved by Quality Engineer before actual commencement of supply of materials at site from fresh sources.
5) All backfill material shall be tested in laboratory once at the time of approval from source.
A) Soil used for backfilling:
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| JCB backhoe loader |
1) Murrum: - Murrum for backfilling shall be freshly excavated, free from vegetation, boulders, silt and clay. Murrum can be either hard or soft.
2) Sand: sand for backfilling shall be of medium size, hard, free from organic and other deleterious materials, silt and clay.
3) Rubble: - Rubble for soling shall be hard, tough, and durable. It shall be regular in shape and of size of about 200 to 230 mm.
1) All backfill material other than rubble shall be free from roots, grass and rubbish. It shall be reasonably well graded and of maximum size 80 mm. All lumps and clods of size larger than 80 mm shall be broken down using wooden mallet.
2) Material brought from outside sources shall be approved by Quality Engineer at the place of source and shall be visually checked each time during its delivery and unloading at site throughout the period of backfilling work.
3) Backfill material (Murrum and rubble) shall be tested in laboratory at time of approval from source.
4) Change in source of materials shall be avoided. If unavoidable, the new sample and the source shall be again approved by Quality Engineer before actual commencement of supply of materials at site from fresh sources.
5) All backfill material shall be tested in laboratory once at the time of approval from source.
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