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You need a volume of 50 cubic metres/yards of compacted clay material 50/.9 = 55 cubic metres/yards of the bank volume material that you need to keep on site. If you excavated an area of 200 cubic metres/yards of clay and you need to backfill a 50 cubic meter/ yard area, then you know with the swell percentage that the loose pile of material has a volume of 300 cubic metres/yards.Īpply the shrink percentage of -10% to the bank volume.ġ cubic metre/yard of bank clay material after compaction becomes 0.9 cubic metre/yard in volume. With the shrinkage percentage you can estimate the amount of material you need to keep. use it for backfilling or grading and it needs to be compacted, as you are compacting the material it will reduce the amount of voids, reducing the volume. If you needed to keep some of the material on site, e.g. If you had to take all this excavated material off site by means of trucking you could be in for quite a surprise if you calculated the volume that had to be removed from the material in its natural state. If you dig it out of the ground and throw it on a pile it loosens up and adds void spaces/air pockets to the material resulting in an increased volume. One cubic metre/yard of clay becomes 1.5 cubic metre/yard as it changes from bank to loose. That means that for every 1 cubic metre/yard of material that you excavate the volume increases by 50%. Both the loose and compacted volume are calculated from the bank volume.Įxample: If you are excavating dry clay it is listed as having a swell of 50% and a shrinkage of -10%.