Answer / bhupinder salwan

For converting wet volume of concrete to dry volume of material mix we multiply it by 1.52 to 1.54. As water is added in dry material to make it wet concrete and then placed in shuttering particles slides to readjust in pores and voids reducing the volume of it. The void ratio compressibilty of stone aggressive is 32 to 33% where as that of sand is 20%. Assumig the cement particles being very fine get adjusted in compressed voids total volume of dry material (having 0.33 +0.20=0.53 voids) has nearly 52 to 54 % more volume than when in wet state.So volume of dry material for concrete is arrived at by multiplying wet concrete qnty by 1.54. Based on same reason if we want to get volume of dry material for mortar wet volume should be multiplied by 1.20. However some engineers add 5% to 10% to multiplicative figure of 1.54 or 1.20 to account for wastage and poor workmanship. Hope it is clear.

By Bhupinder Salwan Executive Engineer Indian Railways.

Answer / hidayathulla

First your question is wrong. how ever

for one cum:- ADD 30 to 33 % dry volume Because the volume will reduce after mixing water.so that we add that %. and
for one cum:- ADD 20% of wet mortor for wastage,Uneven surfaces ect.

there fore for one cum :- 1+0.3+0.2 =1.50 to 53.

we can use this at the time of material requirement ect.

Answer / abdul marig

is 1.54 is same for all ratios of cement??? like 1;1;3 or 1;1.5;3

Answer / paripurna nand srivastava

Because when we added water the volume reduce.we can say wet volume is less 1.54 times than dry volume calculated.

Answer / ramya

If wet volume is converted into dry volume then dry volume is raised 54% of wet volume
Hence, dry volume : Wet volume➕ 54%wet
. volume
dry volume : ( 1➕ 0.54 ) wet volume
. dry volume : 1.54 * wet volume

Answer / subhendu suman

Is this factor is mentioned anywhere in IS code?

Answer / afridi

cuz there is water in concrete and for dry volume we
multiply 1.54.

Answer / yini

Because when water is added to cement, it gets used up by hydration of cement and absorption of FA and CA, so the volume decreases. To maintain the volume 1.5 (shrinkage factor) is multiplied with the wet weight.

Answer / khossain445

i dont know

Answer / subhas bera

This is experimental value we dont calculate accurate value.it is assume for 1m3 conc when we convert wet to dry 1.64 is multiply. Cause some vol of conc is reduce and some wastage it is may be not.

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