Tamping. The term “tamping” as used herein in conjunction with the phrase “treating surfaces of unset concrete” shall mean the final compaction and surface finish to be applied to unset concrete beds, or the like, with a steel shod beam tamper, either manually or mechanically operated unless otherwise stated. The resulting surface finish shall have a slightly ribbed appearance.
Tamping. If the material is to be compacted by tamping, or under appropriate circumstances, rolling, the material shall be deposited and spread in uniform, parallel layers not exceeding 8 inches thick before compaction. Before the next layer is placed, each layer shall be tamped as required so as to obtain a thoroughly compacted mass. Care shall be taken that the material close to the bank, as well as in all other portions of the trench, is thoroughly compacted. When the trench width and the depth to which backfill has been placed are sufficient to make it feasible, and it can be done effectively and without damage to the pipe, backfill may, on approval, be compacted by the use of suitable rollers, tractors, or similar powered equipment instead of by tamping. For compaction by tamping (or rolling), the rate at which backfilling material is deposited in the trench shall not exceed that permitted by the facilities for its spreading, leveling and compacting as furnished by the Contractor. If necessary to ensure proper compaction by tamping (or rolling), the material shall first be wet by sprinkling. However, no compaction by tamping (or rolling) shall be done when the material is too wet either from rain or too great an application of water to be compacted properly; at such times the work shall be suspended until the previously placed and new materials have dried out sufficiently to permit proper compacting, or such other precautions shall be taken as may be necessary to obtain proper compaction.
Tamping. Use a tamper cart with a minimum 200-pound load or a vehicle tire as recommended by the manufacturer. Tamp the edges of the tape. Use a modified tamper cart roller if necessary. Use of a vehicle tire to tamp a long line application of temporary removable pavement marking tape is acceptable provided the vehicle is recommended by the manufacturer and acceptable to the Representative. When using the tamper cart do not twist or turn the tamper cart on the tape and make sure all edges are firmly adhered.
Tamping. Whenever earth fill is placed adjacent to structures or at locations where it is not practicable to use a roller, the fill materials shall be tamped by use of mechanical reamers or tampers. Each layer shall be compacted to a density equal to or greater than obtained under the above rolling procedure for the type of compaction designated Each successive layer shall contain only that amount of material, which will insure proper compaction, but in no instance shall any layer be greater than thirty (30) centimeters (loose measurement) in depth. The Engineer or his Representative must approve each layer before the next layer is placed.
