why 50% more is assumed while calculating dry volume of coarse and fine aggregat

why 50% more is assumed while calculating dry volume of coarse and fine aggregates in concrete calculations.whether 50% more is correct? How is it decided? whether the same is applicable to cement volume. Also what about cement mortar dr volume? How much more is to be considered for dry volume of mortar.

Question Posted / ghantola

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why 50% more is assumed while calculating dry volume of coarse and fine aggregates in concrete calcu..

Answer / rdshah

it is consider by shrinkage, wastage and voide having in the concreting.
yes 50 to 52 % correct, it practically prove.

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