According is IS 2386 the formula of bulking of sand

=(A−BB)×100

A=bulking sand

B=dry sand

In question concrete mix ratio is given by 1:2:4

Cement= X , sand = 2X, aggregate = 4X

Bulking of sand=15 %

15=(A−BB)×100=(2X−BB×100)→B=1.739X

then ratio of dry sand to cement

=Bcement=1.739XX=1.739

Question

# If bulking of sand is 15% and concrete mix ratio is 1:2:4 then what is correct volume batch concrete mix ratio?

If bulking of sand is 15% and concrete mix ratio is 1:2:4 then what is correct volume batch concrete mix ratio?

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