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The mix design M-50 grade (Using Admixture –Sikament) provided here is for reference purpose only. Actual site conditions vary and thus this should be adjusted as per the location and other factors.

Parameters for mix design M50

Type of cement = O.P.C-43 grade
Brand of cement = Vikram ( Grasim )
Admixture = Sika [Sikament 170 ( H ) ]
Fine Aggregate = Zone-II

Sp. Gravity
Cement = 3.15
Fine Aggregate = 2.61
Coarse Aggregate (20mm) = 2.65
Coarse Aggregate (10mm) = 2.66

Minimum Cement (As per contract) =400 kg / m3
Maximum water cement ratio (As per contract) = 0.45

Mix Calculation: –

1. Target Mean Strength = 50 + ( 5 X 1.65 ) = 58.25 Mpa

2. Selection of water cement ratio:-
Assume water cement ratio = 0.35

3. Calculation of water: –
Approximate water content for 20mm max. Size of aggregate = 180 kg /m3 (As per Table No. 5 , IS : 10262 ). As plasticizer is proposed we can reduce water content by 20%.

Now water content = 180 X 0.8 = 144 kg /m3

4. Calculation of cement content:-
Water cement ratio = 0.35
Water content per cum of concrete = 144 kg
Cement content = 144/0.35 = 411.4 kg / m3
Say cement content = 412 kg / m3 (As per contract Minimum cement content 400 kg / m3 )
Hence O.K.

5. Calculation for C.A. & F.A.: [ Formula’s can be seen in earlier posts]-

Volume of concrete = 1 m3
Volume of cement = 412 / ( 3.15 X 1000 ) = 0.1308 m3
Volume of water = 144 / ( 1 X 1000 ) = 0.1440 m3
Volume of Admixture = 4.994 / (1.145 X 1000 ) = 0.0043 m3
Total weight of other materials except coarse aggregate = 0.1308 + 0.1440 +0.0043 = 0.2791 m3

Volume of coarse and fine aggregate = 1 – 0.2791 = 0.7209 m3
Volume of F.A. = 0.7209 X 0.33 = 0.2379 m3 (Assuming 33% by volume of total aggregate )

Volume of C.A. = 0.7209 – 0.2379 = 0.4830 m3

Therefore weight of F.A. = 0.2379 X 2.61 X 1000 = 620.919 kg/ m3

Say weight of F.A. = 621 kg/ m3

Therefore weight of C.A. = 0.4830 X 2.655 X 1000 = 1282.365 kg/ m3

Say weight of C.A. = 1284 kg/ m3

Considering 20 mm: 10mm = 0.55: 0.45
20mm = 706 kg .
10mm = 578 kg .
Hence Mix details per m3
Increasing cement, water, admixture by 2.5% for this trial

Cement = 412 X 1.025 = 422 kg
Water = 144 X 1.025 = 147.6 kg
Fine aggregate = 621 kg
Coarse aggregate 20 mm = 706 kg
Coarse aggregate 10 mm = 578 kg
Admixture = 1.2 % by weight of cement = 5.064 kg.

Water: cement: F.A.: C.A. = 0.35: 1: 1.472: 3.043

Observation: –
A. Mix was cohesive and homogeneous.
B. Slump = 120 mm
C. No. of cube casted = 9 Nos.
7 days average compressive strength = 52.07 MPa.
28 days average compressive strength = 62.52 MPa which is greater than 58.25MPa
Hence the mix accepted.

We are thankful to Er Gurjeet Singh for this valuable information.

More Entries :
• vasan sampath April 10, 2009 at 2:42 pm

it is very use full to my study

• Vijay G. April 15, 2009 at 5:01 am

Mr Gurjeet,
On what basis you have considered admixture is giving 20% water reduction.
have checked that?
What is the workability, wet density & strength you got?

• Kapil April 15, 2009 at 10:21 am

Dear sir we are using M:40 and M:60 with OPC cement, is it possible to achive M:40 with PPC cement.

• AP April 16, 2009 at 9:30 am

Dear Gurjeet Singh

Can I please know which part of India are u working??I’ve been in Delhi where v had to design M50 grade. We used tosham aggregates and had to add cement @ 440 kg per cu.m. Its interesting u achieved in just 422kgs. congrats

• Mehul April 17, 2009 at 4:40 pm

Hi Dear Sir,

Mehul Waghadiya Hear, iam technical manager for GTH company,

Please give me a idea or reference for Conducting and Casting of Dry lean concrete at Lab and how to calculat this design mix and how to calculate the proportion.

Thanking You

• Navin April 22, 2009 at 10:56 am

Is it anybody have mix design of M70 Concrete

• Maheshkumar Thakur May 6, 2009 at 8:39 am

what is the sp.grvity of concrete? hw it is calculated?

• Bilal Ahmad Hakimi May 6, 2009 at 5:51 pm

Hi to all my dear sirs
? m n Turkey and I w?ll start my lessons after 3 months. I want to b a super eng?neer. So I want some adv?ces from u teachers and some lessons from u.
w?sh u all the best

• Bilal Ahmad Hakimi May 6, 2009 at 6:01 pm

I forgot to say that I want to b c?v?l eng?neer. I m from from Afghan?stan I came here for studay?ng.

• Prabhu May 13, 2009 at 10:06 am

Dear sir,
It is very useful for Practcal experiences.

Regards,
PRABHU.

• ravi hosamani May 31, 2009 at 9:05 am

i want more infromation testing on cement

• nabil June 25, 2009 at 11:42 am

if we want to use Silica Fume + GGBS to improve the durability (ISAT.RCP Penetration …)have you got any suggest of the % concrete mix with OPC

• Nagesh June 26, 2009 at 4:47 am

Dear sir,
It is very useful for Practcal experiences.

Regards,
Nagesh.

• jagmal singh July 20, 2009 at 8:53 am

It is very useful for practical .
what i want to known how u assume water cement ratio 0.35.

• Sanjay kumar singh July 29, 2009 at 5:28 am

Dear sir,
It is very useful for Practcal experiences.

S K Singh

• SANTOSH KUMAR PATEL August 11, 2009 at 11:49 am

I AM DESIGNING M-50 CONCRETE FOR PRESTRESSED MEMBER, WHICH NEED EARLY STRENGTH OF 15mpa IN 24HRS, MIN. CEMENT SHOULD BE 400KGS/CUM, CLIENT REQUIREMENT IS TO MAINTAIN A CEMENT QTY OF 470KGS BUT IS456-2000 DIDNOT PERMIT THAT PLEASE GIVE ME SOLUTION

• NAGUR August 21, 2009 at 2:55 pm

Dear sir,

I am very thankful for your valuable solution for its contents.

• manikandan.v September 2, 2009 at 3:41 am

sir,
i would like to know how calculate 1:2:4,1:2:3 & 1:1.5:3

1 cu.mtr concretes required cement,sand,aggregate & water

etc.and also i need howmany grade of concrete mix normaly

used (Like m15,m20,m50 etc).

thank you……….(HAPPY ONAM)

• sonali September 11, 2009 at 7:53 am