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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.

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• arunkumar trivedi May 14, 2013 at 4:06 am

thanks sir pl mor sharing y”r knwldg

• prachi May 23, 2013 at 12:53 am

its helps us a gud knowledge to us.. thankfull to all of us..:_)

• SENYO EZEKIEL July 30, 2013 at 10:18 am

• RAJIB MAHATA August 25, 2013 at 8:53 am

thanks

• N.RAJ February 11, 2014 at 7:38 am

thank you sir…………

• S RAJU October 31, 2014 at 2:15 am

Thank u sir …………….

• jyotish kumar November 5, 2015 at 1:17 pm

Thank you sir………..

• sumit sharma March 22, 2016 at 10:17 am

I want m50 grade jobmiix for interlocking paver blocks 100 mm

• Ramniwas June 27, 2016 at 3:39 am

Thanx sir

• raju kumar singh January 27, 2017 at 2:24 am

Excellent knowledge for M50 Grade mix design.
Thank you Sir

• Vikram kohli October 9, 2017 at 8:53 am

Sir I want m50 strength for 100 mm interlock paver

• M.Balaramulu January 10, 2018 at 6:36 am

i request to post M-60 design mix details if any body has and problems encountered in handling of high grade concretes.

• kishore January 11, 2018 at 12:09 am

Why had yu assumed target mean strength 5X1.65 can yu define it

• Khursheed lone February 7, 2018 at 2:30 am

Sir I want M 50 strengh for 200×225×100 mm interlock paver

• pankaj kumar May 22, 2019 at 7:22 am

Concrete Mix Design for M50 grade only for GP2 & 10mm Aggregates

• pankaj kumar May 22, 2019 at 7:23 am

size 650x450x280

• Dilip kale May 31, 2019 at 6:08 am

Sir please tell me for m-50 concrete how many compressive strength required after 28 days as per Is coad.