Structural Backfill. The designated material as indicated in the Contract Documents to attain the proposed grades abutting or adjacent to site structures.
Structural Backfill a. In-place density tests may be performed at all locations where at least one cubic meter of backfill is required. In-place density tests will be performed as often as the Engineer deems necessary to properly control the quality of the compaction work.
Structural Backfill. Backfill behind walls will begin after the walls have achieved enough strength to withstand stresses from compacting equipment. Our field technician will verify the suitability of the backfill material prior to fill placement. He will observe backfill placement and conduct in-place density tests as the fill progresses. Areas of failed tests will be reworked until passing results are achieved. Trench Backfill Our field technician will be present on an as-needed or full-time basis during all phases of trench backfilling unless otherwise directed by your representative. The sand-cone method is preferred to overcome trench corrections which are necessary for the nuclear method and which can sometimes lead to questionable results. The relative compaction will be computed on the basis of the field density determinations for each particular soil type encountered. The maximum density shall be determined in accordance with the ASTM Standard D1557. This determination will be conducted in the laboratory, but each technician is equipped with the necessary apparatus for conducting this test in the field so that immediate test results can be provided, if necessary.
