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# Ratio about concrete

what is the quantity of 20mm concrete, sand used for 1 CUM R.C.C
Asked by: Interview Candidate | Asked on: Jul 14th, 2011
Showing Answers 1 - 5 of 5 Answers
RAMA MOHANA RAO

Answered On : Jul 16th, 2011

Your Question was wrong, what I am understand is M20 concrete 20mm metal is used.
m20- volumetric ratio - 1: 1.5 : 3

metal - 0.92 m3
sand - 0.46 m3
cement -0.31m3-441kgs in design mix 240kgs in moderate condition

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krishnan rano

Answered On : Dec 16th, 2011

For 1m3 of solid concrete the dry concrete mix should be 1.52m3.
so 1.52/(1+1.5+3) will give u the proportion for one part which is .267
therefore for cement .276m3
for sand .414m3
for coarse aggregate .818m3

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DALEY.VIDYASAGAR

Answered On : Jun 30th, 2012

I can understand your answer you asking about M20 CONCRETE .
CALCULATION:
Coefficient Method is actually M20 ratio is for Nominal mix 1:1.5:3
1:cement,
1.5:sand,
3:coarse aggregate,
For 1 cum concrete preparation required 0.46 cum of sand &0.92cum coarse aggregate and then 1/1.5(sand)x0.46x1440(cement Wt/1cum)=441.6kgs (or)441.6/50kgs(1bag of cem.)=8.83bags.

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N.Ravikmar

Answered On : Jul 2nd, 2012

The total volume of materials needed for getting 1cum of concrete is 1.5cum.
The mix prop for M20 is 1:1.5:3.
So let a be the qty of cement,
then a+1.5a+3a=1.5
5.5a=1.5
a=0.27
so cement=0.27cum,sand=o.41cum,gravel=0.81cum.
This is more descriptive way to understand,the way of cal.the qnty.

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Amr

Answered On : Sep 23rd, 2012

The answers above not correct .. when we use that equation x+1.5+... = 1

we have to multiply by 0.7 as compaction factor so it will be

.7 ( x+1.5x + ... ) = 1

then get x the weight of each one

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