PERFORMANCE OF LOCALLY MADE COMPACTION RAMMER FOR COMPACTING GRANULAR BACKFILL SOIL

Authors: M. Roknuzzaman1*, M.I. Mostazid1,2, M.A. Asef1 and A.R. Rakin1
* Corresponding Author
Published on 2023-07-30
DOI: https://www.doi.org/10.59125/JST.21105
Abstract:

It is a usual practice to use locally made compaction rammer to compact small-scale compaction works like plinth filling and backfilling in Bangladesh. As no formal specification is followed to make such rammers and compacting soil with them, the present study is taken into consideration to develop some guidelines for making the local compaction rammers and evaluating their performance in compacting backfill soil by measuring the relative compaction. Three different rammers of different weights are made using concrete and bamboo handles. A 150 mm thick layer of backfill soil is compacted using the rammers in the conventional approach which is usually practiced by local workers. Relative compaction values after a certain number of blows are measured using sand replacement tests. Observations are made for 10 rounds of compaction with each rammer. The number of blows required to attain an acceptable level of compaction for rammers with different weights is presented. The heavier rammers are found to attain the desired compaction quicker than the lighter ones. Relative compaction of about 90% is achieved with a 13.5 kg rammer and a 9 kg rammer. To attain the same level of compaction, 2 additional rounds of blows are required in the case of the 9 kg rammer. On the other hand, about 82% compaction is achieved with a 6 kg rammer by 10 rounds. The findings of the study assist in helping the countryside constructors to maintain a proper degree of compaction for smaller scale building backfills.

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