How to calculate the quantity of water for a given mix concrete. As it would be required to calculate for mix 1:2:4.

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## NARENDERSINGH

As per Is code 456-200 clauses 6.1.2

maximum free water cement ratio for M15(1:2:4) is 0.50

for 1 cubic metre concrete

1+2+4=7

cement content =1/7 *1 =0.1428 m3

density =mass/volume

density of cement =1440kg/m3 (note :- density of cement varies with grade and brand)

mass of cement =0.1428*1440=205.632 kg (note:- please consider minimum cement content also i.e. also given in clauses 6.1.2 of Is code)

w/c as per IS code is 0.50 for M15

w/c=0.50

water content=0.50*205.632=102.8 m3 =103 litre

Note:-w/c depends on various factors like moisture content of fine/coarse aggregate,workability …..

## vsandeep577@gmail.com

for Mix 1:2:4 water requirement would be-Plain concrete(moderate)The Minimum cement content for M15=240 kg/ m3

and min water cement ratio =water/cement =0.60

=water/240=0.60

Min water requirement for mix=240*.60=120 liters

It is also depend upon climate condition,method of mixing and the purpose of use.

## wissam

Can you please tell me where you got the wet of concrete is 1.54 cu/m

## chrisjackson

The mix 1:2:4 represents the M15 grade of concrete, which means the concrete formed with this ratio has a compressive strength of 15 kN/m^2. 1:2:4 represents the amount of cement, fine aggregate (sand) and coarse aggregate to be added during batching of concrete.

Calculation of Water Quantity for Concrete

If we need to calculate Water quantity for concrete, first find the cement content for the volume. Therefore, Required amount of water = 0.5 X 50 kg = 25 litres / 50 kg cement bag. For the Design mix, the W/C ratio will depend upon the workability, strength requirements.

## Seshachalam Chamarthy

Calculate the existing moisture content in the aggregates (fine & coarse) and it will be deducted from the water content, which is calculated from water cement ratio

Moisture content in Coarse aggregate – x1

Moisture content in fine aggregate – x2

Moisture content based on water cement ration (example -0.355) = 0.355*450kg/cum = 159.75

Net water content is = 159.75 – x1 – x2

## Poras Patel

Dear Sir

First of all you need to know the quantity of cement.

1:2:4 Means M15 Grade

Cement require for 01 Cu.m Concrete is:

Wet volume of concrete is 1.54 Cu.m = (1.54/1+2+4)*1 = 0.22 Cu.m

Now 0.22 Cu.m Cement = 0.22*1440 Kg/m3 (Density of cement) =316.80 kg cement = 316.80 kg

Now W/c Normally require for M15 Grade is 0.50

So water require: W/C = 0.50 =

C*0.50 = Water

316.80*0.50=Water

Water = 158.40 Litre/Cu.mObviously, water quantity cannot be decided based on the quantity mix design proportions only. There are other data which need to be known in order to be able to specify water content quantity for example, types of structural element, maximum aggregate size, and required workability. If these data are available, then the quantity of water can be easily computed from Table 6.3.3 of ACI 211.1-91.

Required slump can be determined based on the structural element type. Maximum aggregate size and slump value can be used to determine quantity of water for 1 meter cubic of concrete.

## muganeza2016

Yes, thank you Mr. Madeh Izat Hamakareem for your good answer.

## aviratdhodare

r = w_{h20}Â / w_{c}Â Â = 8.33 q_{H20}Â / w_{c}Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (1)whereÂr = water to cement ratiow_{h20Â }= weight of water (lbs)w_{cÂ }= weight of cement (lbs)q_{H20Â }= volume of water (US gallon)## Example – Water to Cement Ratio

A batch of concrete has 45 gallons of water and 900 lbs of cement. The water to cement ratio can be calculated as

r =Â8.33 (45 gallons)Â / (900 lbs)Â Â =Â 0.42ÂFor any nominal mix of concrete, there is a maximum free water cement ratio as per Table 5 of IS 456:2000. Depending upon the exposure condition the w/c ratio will vary.

Suppose you are castingÂ M15Â concrete for Moderate condition, the maximum w/c ratio is 0.6. If you are using 240 kg/m^3 of cement, the water required will be

W/c = 0.6 ; w = 240 kg/m^3

then, w= 0.6*c = 0.6 * 240 kg/m^3 = 144 kg/m^3.

## dbnalawade

The accurate quantity of water for a mix depends your selection of water cement ratio, compressive strength, workability, durability, maximum nominal size of aggregate, grading,type of aggregates , absorption and the degree of control. The question of 1:2:4 could be on mix by volume or mass. W/C ratio is usually determined by mass.

IS:456 is s good code to follow for design a mix.

## Dhanya

The W/C ratio varies from 0.4 to 0.6 as per IS 10262(2009) for a normal mix

To calculate the amount of water required for a concrete mix, we need to calculate the quantity of cement required.

Assume the required amount of cement is 50kg

Amount of water required = W/C ratio x cement required.

= 0.5 x 50

= 25 litres/50kg

For the design mix, W/C ratio depends upon the workability and strength requirements.

## vihar varu

The quantity of water calculates the base one depend on the water-cement ratio.

W/C=AS PER IS CODE RATIO(DEPEND ON GRADE OF CONCRETE)

## chrisjackson

If we need to calculate Water quantity for concrete, first find the cement content for the volume. Therefore, Required amount of water = 0.5 X 50 kg = 25 litres / 50 kg cement bag. For Design mix, the W/C Ratio will depend upon the workability, strength requirements.

## Vívèk Gúptã

it has a simple way to solve that.

The taken water ratio of your mix design (multiply)Weight of cement.

W/C*Quantity of cement= Quantity of water