**Concrete Mix Design:-**

Concrete is a composite mixture which consists of Cement, Sand and Aggregate. Concrete mix design is the procedure for finding the right quantities of these materials to achieve the desired strength. Accurate concrete mix design makes concrete construction economical. Large constructions such as Bridges, dams requires huge amount of concrete, using the right quantity of constituents make the structure economical. In order to calculate or find the right amount of cement, sand and aggregate required in **1m ^{3}** of concrete; you need to know about different grades of concrete.

As per IS456:2000, Different grades of concrete are classified into M5, M7.5, M10, M15 etc., whereas **M** stands for **Mix** and the number behind **M** stands for **Characteristic Compressive strength(fck) of the concrete in N/mm ^{2} @28 days** when checked with 15cm×15cm×15cm

**cube**in

**direct compression test.**

Contents

- Concrete Mix Design:-
- Different grades of concrete :
- Different types of Concrete mixes:
- Nominal Mix:
- Design Mix:
- Calculation of Quantities of Cement, Sand and Aggregate in 1m3 of concrete:-
- Concrete Mix Design for M20 Grade Concrete:-
- Calculation of Volume of Cement in 1m3 of Concrete:-
- Calculation of Volume of Sand (Fine Aggregate) in 1m3 of Concrete:-
- Calculation of Volume of Coarse Aggregate in 1m3 of Concrete:-
- Amount of Water Required for 1m3 of Concrete:-
- Table for Quantity of Cement, Sand, Aggregate, Water required for Different grades of concrete :-
- Concrete Calculator (Concrete Mix Design Automatic Calculator):

**Concrete Mix design of M5, M7.5, M10, M15, M20, M25, M30 and higher grades of concrete is calculated as below:**

The procedure for finding the different grades of concrete mixes are same. The below mentioned method can be applied to any grade of concrete by changing the values. To make ease in understanding we are finding the Concrete mix design of M20 grade concrete.

The Concrete mix ratio for M20 grade of concrete is 1:1.5:3 that mean 1 part of cement, 1.5 part of sand (fine aggregate) and 3 parts of aggregate (crushed stone) in volume and then batched for mixing. To know the Concrete Mix Design follow below:-

**Mix Design (M) = Cement: Sand :Aggregate **

As per BS 8500-2 British/European standards The grade of concrete is denoted as C10, C15, C20,C25, etc., **‘C’ **which means ‘**Concrete** **Strength class’ **and number behind **C** refers to characteristic Compressive strength of Concrete in N/mm^{2} @ 28 days when tested with the 15cm dia & 30cm height **cylinder **in **direct compression test**

The grade of concrete is also denoted as C16/20, C20/25, C25/30, etc., which means **Concrete Strength Class (C) **the number behind** C refers** to Compressive strength of Concrete in N/mm^{2} when tested with** Cylinder / Cube.**

Remember :

1MPA = N/mm^{2}

## Different grades of concrete :

Different grades of concrete has different Concrete Mix proportions which means different concrete mix ratios. As Per **IS456:2000, ** the Concrete mix design has the following concrete mix proportions :-

Type of Concrete | Concrete Grade | Mix Ratio | Characteristic Compressive strength of Concrete @28Days in N/mm2 |
---|---|---|---|

Ordinary concrete | M5 | 1:5:10 | 5 N/mm^{2} |

M7.5 | 1:4:8 | 7.5 N/mm^{2} | |

M10 | 1:3:6 | 10 N/mm^{2} | |

M15 | 1:2:4 | 15 N/mm^{2} | |

M20 | 1:1.5:3 | 20 N/mm^{2} | |

Standard Concrete | M25 | 1:1:2 | 25 N/mm^{2} |

M30 | Design Mix | 30 N/mm^{2} | |

M35 | Design Mix | 35 N/mm^{2} | |

M40 | Design Mix | 40 N/mm^{2} | |

M45 | Design Mix | 45 N/mm^{2} | |

M50 | Design Mix | 50 N/mm^{2} | |

High Strength Concrete | M55 | Design Mix | 55 N/mm^{2} |

M60 | Design Mix | 60 N/mm^{2} | |

M65 | Design Mix | 65 N/mm^{2} | |

M70 | Design Mix | 70 N/mm^{2} |

## Different types of Concrete mixes:

Concrete Mixes are primarily divided into the two different types :

**Nominal Mix: **

Nominal Mix is generally adopted for small scale constructions. In this type of mix, the mix ratios and concrete constituent proportions are prefixed and specified. Eg: M20(1:1.5:3); the quantity of cement, sand and aggregate is batched in volume as per the fixed ratio 1:1.5:3. From the above table till M25 grade, the concrete proportions are called as **Nominal mix concrete.**

**Design Mix: **

Design mix concrete is adopted for high rise constructions. In this type of mix, the mix ratios are decided by an Engineer after analysing the properties of individual ingredients of concrete. Like, cement is tested for Fineness modulus and Specific gravity of cement in the lab while deciding the Design mix ratio. There is No Pre-fixed ratio, and ingredients are are batched in weight. From the above table, concrete grades more than M25 falls in Design mix.

In Simple, Design Mix refers to the ratios which are decided by the designer.

## Calculation of Quantities of Cement, Sand and Aggregate in 1m^{3} of concrete:-

To calculate the individual quantities of cement, sand and aggregate required for 1m^{3} assume a nominal mix grade of concrete such as M20. You can use same method to calculate any grade of concrete.

### Concrete Mix Design for M20 Grade Concrete:-

Now let us consider M20 grade concrete;

As per IS456:2000, M20 Grade concrete proportion is =** 1 : 1.5 : 3 **

We have to add all the volume to know the total volume = 1 + 1.5 + 3 = 5.5

As we know that during concreting when we place wet concrete, it gets harden after certain standard time. Considering the same it had be decided upon by Civil design Engineers to take a factor of safety ranging from 1.54 to 1.57 to counter that shrinkage.

**i.e volume of dry Concrete = 1.54 to 1.57 times Volume of wet concrete**

I am Assuming** 1.57** as factor of safety

So total volume of concrete required is 1.57 m^{3}

#### Calculation of Volume of Cement in 1m^{3 }of Concrete:-

To calculate the Quantity of Cement in Concrete the following formula is used.

Volume of Cement

=

^{Cement}⁄_{Cement+Sand+Aggregate}x 1.57

**For 1m ^{3} of Concrete = 403.2Kgs of Cement is required. **

No. of Cement Bags required for 1m^{3} of Concrete = 403/50 = 8.06 ~** 8 bags **

Hence we require **8 bags of cement** for 1m^{3} of concrete.

Also Read:

Detailed explanation for No. of bags required for 1 cum of cement

#### Calculation of Volume of Sand (Fine Aggregate) in 1m^{3 }of Concrete:-

The following steps are followed to find the quantity of sand in 1m^{3} of concrete.

Volume of Sand

=

^{Sand}⁄_{Cement+Sand+Aggregate}x 1.57

Sand usually consists of moisture content. It increases the volume of sand (bulking of sand).

For accurate calculation use dry sand or include the effect of bulking as mentioned above in calculation.

Hence we require **672kg** of sand for 1 cu.m of concrete.

#### Calculation of Volume of Coarse Aggregate in 1m^{3 }of Concrete:-

The following formula is used to find the quantity of coarse aggregate in 1m^{3} of concrete.

Volume of Aggregate

=

^{Aggregate}⁄_{Cement+Sand+Aggregate}x 1.57

Density of aggregate may go higher if void spaces decreases. 5mm aggregate has more density when compared with 20mm size of aggregate

Hence We require **1326Kg** of 20mm aggregate for 1m^{3 }of Concrete.

#### Amount of Water Required for 1m^{3 }of Concrete:-

For making concrete, required amount of water is added. Water quantity is depends upon the climatic factors and workability required. We generally maintain 0.35-0.50 of water cement ratio. Remember, above values may change according to the moisture content present in sand and aggregate.

Cement Required for 1m

^{3 }of Concrete =400Kgs

Assume W/C ratio =0.50 (50% of cement)

Water required for 1m^{3 }of Concrete. = 400 x 0.50

Amount of Water Required for 1m^{3 }of Concrete = 200kgs =200 litres

Hence **200 Litres** of Water is required for 1m^{3 }of M20 Concrete

**Summary:** –

**8 bags** of cement required for 1 cu.m of M20 grade concrete.

**672 kg** of Sand required for 1 cu.m of M20 grade concrete.

**1326 kg** of 20mm Aggregate is required for 1 cu.m of M20 grade concrete.

**200 litres** of water is required for 1 cu.m of M20 grade concrete

#### Table for Quantity of Cement, Sand, Aggregate, Water required for Different grades of concrete :-

** **

**Concrete Calculator (Concrete Mix Design Automatic Calculator):**

**You can also refer: **

**Curing of Concrete & Curing methods Important Properties of Concrete 14 Different types of cement**

For Instant updates Join our Whatsapp Broadcast. Save our Whatsapp contact

+919700078271asCivilreadand Send us a message “JOIN“Never Miss an update

Click on Red notification belland allow notification. Stay tuned! More are updated Soon!!.

Civil Read Wishes you ALL the BEST

sir your blog is awesome …but you given a whatsapp number that is not workig…so please add me in your whatsapp group…

my no : 8012791331

hey Naveen,

Save our Whatsapp contact 9700078271 and send us message JOIN. We add u in Broadcast.

Stay connected with civilread

Hi sir,thank u so much for this information

Hi naveen

Your site is very help ful fot me

I want mix designs microw concrete above m60

Like basf 466

Please add me.

I m already send you message on whatsapp

hi sir,good evening

i studied concrete mix design for M20 .its really nice,i learned so much , in addition to ,i want to know the water quantity .but you don’t represents that in the mix design sir

Hi thivakaran,

Thanks for ur feedback

will update it in three days

Stay tuned:)

Hey Thivakaran,

As requested I have added amount of water required for different grades of concrete.

Found it useful ? Dont forget to add your comments.

sir Your Blogs are awesome, really providing valuables notes kindly add my what app no. in ur whats app group it is = +2348106432154 (i m in Nigeria working as project engineer)

Thank you☺

Very useful information

Hi sir I am jayabal my what’s up number add please 9787474389

Sir which is the best stream for civil enng to do mtech pls guide me

love u bro

such a information

Pls sir. Kindly add me up on your whatsapp number. 08162578620 Thanks for dis useful tips

kindly add me too, you are wonderful. my whatupp no. +233207094614

sir

volume of the dry concrete =1.57 *5.5

why take only 1.57

dry volume varies from 1.54-1.57 i took max in calculation

Add my what’s app number also

What’s app number 0060149469425

very nice bro plz add my no what’s app no. 9827222988

Pls sir. Kindly add me up on your whatsapp number. 998135003 Thanks for dis useful tips

i find tths tips very useful and have been using it for my calculations

yes you can use this method for calculation. As already mentioned these are approximate values and differs based upon the environmental conditions, moisture content in aggregate, sand, cement, water cement ratio

How many kg sand, cement, aggregate and water is required for 1cum of m25 concrete for mix design

fnd out the ratio of your design mix and apply the above method.

Nice information , pl.add my whats app no.9854031029

hello sir pls add me 09459653214

Sir mujhe bhi aad kar le 7566390343 my what’s up no

use fl infrmtn it hlpd me vry mch

sir wil u guide for project topic????

Hello sir plz add my whatsap no 9977021736

Thanks very nice.

This is awesome. Thanks for the information

Hi,

Good to read from you and wanted to ask you that if we add up the volume of cement, sand,aggregate and water that is 0.28+.42+.85 equals to 1.55c.m,which is higher than 1c.m,it supposed to be 1c.m when we add up each result in c.m right?

you forgot to work out dry volume

hope this clear your doubt

Hello sir,

It is very useful information… And I am also willing to join your whatapp group.. My whatapp number is 9894966784. Thank you

very useful for students

Add me sir.. 8939189459

sir your blog is awesome …

Your blog is good

Add me in group my what’s app number – 7875097226

good explain nice I like

What are this 1440,1600 and 1560 to multiply with factor of safety and volumes ,how we get those please explain in detailed please…….

those are densities of respective constituents

HAI SIR NICE TO SAY I AM ALSO WILLING TO JOIN YOUR WHATSAPP – 7708507879

how can we calculate quantity of cement, sand and W/C ratio for cement mortar(1:4 or 1:5 or etc.)

Hai sir

M20 aggregate is 1326kg

M40 aggregate how many kg please tell me sir

Very nice please add me8825187681

my number 7094726100 , add me whats app

Helo Sir,

Iam really impressed for your information about this website. kindly add me your whats app group sir.

this is my number 850 871 6764

Sir, am non technical I want to improve on civil how to improve am interested on civil

Thank u so much…….

For giving this clarification sir……..

Hello sir…its v nice site….I get to know many things about civil engineering…thank u for this learning platform

sir,

ho con be culculate Quantity 1cement bags of water cement ratio mins 1 bag cement water culculate use liters ? sir please whats app number 0923445891987

Very nice please add me 9481921464

Hello sir, your blog is awesome but you given a whatsapp number that is not workig…so please add me in your whatsapp group…+918275563464

Hi buddy, i have given correct number. If u are facing issues with whatsapp you can also join us from follow us page

for m25 you mention 565 kg cement in 1m3 of concrete…but as per IS Code…max value of cement content is 450 kg in 1 m3..plz correct my doubt ??

Hi Pooja,

M25 is a design mix were proportions are changed as per design.

Well, I have considered above mentioned proportions for different grades of concrete and tabulated the values.

As i clearly mentioned that above mentioned values are approximate values where actual values may change due to the presence of moisture content in atmosphere and constituent materials as well.

Thanks, Hope this helps.

Krishna,

How did you take the density of cement as 1440kg/m3? Did you mentioning OPC ?

yes it is OPC

have any software calculation costing, cement, Sand, stone, labour . Pls help name of software

thanks and regards

revit helps !

formula of cement as 1440kg/m3?

Pls help CC 1.4.8 require Qty cement total M3 67

i didnt get u clearly. Post your query clearly on forum.civilread.com

Dear brother,

I have a problem,

I have received a work order for the following job.

1. P/I of CC 1:4:8 Qty M3 2.000

Providing and laying lean concrete 1:4:8 mix

ratio using S.R. cement, approved quality 3/4” max: size graded crush

2. P/I of CC 1:2:4 Qty M3 25.000

Providing and laying C.C. 1:2:4 with S.R. Cement specified strength at any level using approved quality 3/4” max. size graded crushed stone

3. Laying of Deformed Steel Bars Qty KG 2,000

Installation of deformed steel reinforcement bars

4. P/I of plaster Qty M2 40

Providing & applying 3/4″ thick cement plaster

5. fabrication & Laying of Channel 6″x3″

Qty KG 300

Services for laying/grouting of Channel size 6″ X 3″ at edge of the civil structure

We have to build foundations. Will you pl give me quantity of Cement, sand

My whatsApp # 092-03002565845

post your query clearly on forum.civilread.com