# how we calculate of Sand, cement and aggregate of M20 ratio or other ratio?

Ex. 1:1.5:3 is the ration of M20 and now how much sand or cement or aggregate we use in this?

Ex. 1:1.5:3 is the ration of M20 and now how much sand or cement or aggregate we use in this?

- M20 = 1:1.5:3

Volume = 1+1.5+3=5.5

Total volume ingredients for using =1.57

Volume of broken stone Require = (3/5.5) x 1.57 = 0.856 m3

Volume of sand Require = (1.5/5.5) x 1.57 = 0.471 m3

Volume of cement = (1/5.5) x 1.57 = 0.285 m3

= 0.285 x1440 = 411 kg

For 1m3 of M20 (1:1.5:3)

Broken stone = 0.856 m3

Sand = 0.472 m3

Cement = 8.22 bag - Mr Sanjeev Kumar

To calculate proportion of cement, sand, coarse agrregate and water, It required to do mix design & for this initially it is requird to find out the properties of all ingradients used for preparing concrete...... - observation based on slump test frist we have to check for wokability and then water cement ratio.it is also a codal provision IS-456 for the nominal mix design.the ratio of cement sand and agregates depends upon grade of concrete.basically it is a test result
- @Usama Metwly:

Respected sir i would like to ask one doubt i.e how the below value come .

Total volume ingredients for using =1.57 - What mean M20 is?
- Dear Sanjeev Kumar,

Its good to see your queries.

M20 (1 cement :1.5 sand :3 stone/brick aggregate). To determine the proportions you have to perform mix design, for this you have to find out the sp.gr. of cement, CA, FA, and water cement ratio, type of exposure, Maximum size of aggregate etc. Once the W/C ratio is determined use 186 kg water (for 20mm CA) to find out the qty. of cement per cum of concrete. Then determine the qty. of FA and CA with the help of formula given in IS:10262-1982, and then divide all the ingredients by cement, then you will get the proportion similar to you mentioned which are in kg.Or you can follow IS:10262 -2009, where the calculations are easier.

Further queries do contact me. - Thank you very much Usama Metwly Sir.

I appreciate your reply, but i doubt is coming. What is meaning of 1.57 and why we use this? - weight of sand, jelly, cement, admixture, water can be predetermined by MIX DESIGN from a reputed lab...volume mix is no longer used at least in professional managed projects
- mr sanjeev this is just a guess,

but, i think Mr. Usama Metwly has taken a rough value of 1.57 as total volume of ingredient.

that is if the Total volume ingredients is 1.57 then if you calculate u'll get Broken stone = 0.856 m3, Sand = 0.472 m3, Cement = 8.22 bag as answer.

instead if we assume or have: Total volume ingredients for using as 2.36 (varies), [this is when you know the overall amount of materials you have].

Volume of broken stone Require = (3/5.5) x 2.36 = 12.8 m3

Volume of sand Require = (1.5/5.5) x 2.36 = 0.64 m3

Volume of cement = (1/5.5) x 2.36 = 0.42 m3

= 0.42 x1440 = 604.8 kg

For 1m3 of M20 (1:1.5:3)

Broken stone = 1.28 m3

Sand = 0.64 m3

Cement = 12.09 bags (where 1 bag is 50 Kg) - 1:1.5:3 or 1:2:4 or 1:4:6 ....etc. .......... Not always represent a volumetric relations, sometime these numbers represent weight not volume. It depends on the mixture design,code, materrial specifications and other site requirements.
- With respect to the above calculations

for 1 m3 or 1 kg or 1 ton ... Etc. Concrete 1:1.5:3

cement (1/5.5) m3 or kg, or ton...etc

sand (1.5/5.5) m3 or kg, or ton...etc

gravel (3/5.5) m3 or kg, or ton...etc - This method is not used now a days. the above method is called volume batching. if you take by weight, it is known as weigh batching.

But presently, the ratio is decided after having detailed testing on the aggregates and cement. You can go through the reference of Ambuja Cement booklets on concrete

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