Mix Design M-50 Grade

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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

Grade Designation = M-50
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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Comments
  • Shashi B Kumar September 27, 2009 at 2:29 pm

    Sir,
    It is very useful to me. I am working in a PSC sleeper industry and we produce PSC Slab of 6.1m span also.
    thank you and wishing you a very happy dasahra.

  • m.kumaran October 5, 2009 at 3:49 pm

    It is very useful to my study . I am studying in B.E., (civil)

  • krishna chaitanya November 3, 2009 at 9:20 pm

    hi
    this is MKC
    It is very wonderful see to your mix design.But still some of the things are missing there that u are preparing ur mix design by considering some of the indian standard.
    In any IS will not say 20% reduction of water and in the ending stage increasing 2.5%

  • Ramakant November 13, 2009 at 3:45 am

    Dear Gurjeet Singh

    How it is possible
    on Assume water cement ratio = 0.35(only 20% water reduction
    according aginest superplatiser) & Cement Content 422 Kg/m3
    u have acchived strength of M-50 with Micro Silica ?

    Plz. reviwe it as u feel comfort

    • Gurjeet November 13, 2009 at 10:31 pm

      Hi, As we are providing plasticizers which means we are increasing the plasticity or fluidity of the concrete. So we can reduce the amount of water required. It is basically done to increase the workability which itself reduce the amount of water required. If we don’t use plasticizer then the amount of water will be increased so as to get the desired workability. And for starting the mix design we have to assume some water cement ratio so as to calculate the quantities of the cement and water.Depending upon the amount of workability required and the site conditions we assume it.
      Please let me know if u still need any clarification
      Yes it is true we have acheived M-50 strength with with 422kg cement amount.
      please elaborate your question regarding acheiving strength with micro silica

  • brahmdeo prasad November 13, 2009 at 8:01 am

    hi
    it is very good to see u mix design.
    i have one question for u, if i used cement of grade 53 – o.p.c inseded of grade 43 -o.p.c used , we want to used fly ash and 400 k.g of cememt, can you give us the detail mix design for M-50 grade of concrete.

  • R.Hemalatha December 19, 2009 at 9:23 am

    sir v r doing a project by using M50 grade of concrete, OPC 43grade.
    Without using any admixtures. can u pls tell me how to calculate the
    water cement ratio and full details about the mix design.
    Thank u

  • dinesh December 22, 2009 at 10:24 am

    sir,
    we are constructing a road with dry Lean concrete(150 mm thk. top layer over a 200mm brick soling) , 13 km. long in sundarban island.pls. guide us on the matter that how to do the rolling over DLC with a 8 ton static roller and how to determine the OMC of the DLC.
    Thank u.

  • larghun January 16, 2010 at 12:08 am

    if you could please tell me the number 1 and 2 aggregate to mm i mean nubmer 1 aggregate is equel to ?mm

  • Minis January 20, 2010 at 2:15 pm

    if you could please me give more tip regarding the mix.

  • habib khan February 6, 2010 at 12:37 pm

    sir
    these are very good notes but sir i want that it should be gernal. because if you sent me gernal notes for concrete mix design i will be very thankful to you for this kind action
    thanks

  • MAHENDRAN B April 12, 2010 at 3:50 am

    dear sir,
    how to fix proportion on concrete? why add to the fly ash

  • Rajendra Ringshia May 2, 2010 at 8:36 am

    I need mix design procedure for Zero near slump concrete for mfg Precast concrete interlocking pavements of M50 grade. This paper deals with .5 W/C

  • b s patil June 1, 2010 at 9:17 am

    Sir, I need mix design procedure for concrete( with OPC)without fly ash; in two cases,(1)having crushed sand as fine agreegate and M1, M2 coarse aggregates,and (2) having both crushed sand and natural sand (river sand) as fine aggregates with M1, M2 coarse aggregates, for any grade of concrete

  • d.r.shetty June 21, 2010 at 6:32 am

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

  • AMIT KUMAR TA June 30, 2010 at 9:27 am

    Respecred Sir

    i shall be highly oblige if you kindly send M60 GRADE CONCRETE mix design as early as possible

  • UCzar Kho (Mynmar) July 8, 2010 at 11:55 pm

    Thank you very much for many kinds of mix design. I am working with Chinese engineers and they are using Chinese Code in Concrete. I want to know the different code used in Indian Standard AND Chinese standard. They use C10, C15, C20, C25, C30 and so on. Could you please compare IS and that of Chinese.

    Thank you.

  • HARVINDER July 17, 2010 at 1:48 pm

    hi your mix design is based on w. c. ratio so upload this also without admixtures

  • Sajan July 27, 2010 at 3:41 am

    Whate is W4 water impermiable concrete?
    please forward C40 W4 grade concrete

  • Dheeraj Agrawal August 17, 2010 at 2:11 am

    Please provide me with the information regarding–

    1. M70 amd M75 concrete compostion
    2. M70 and M75 concrete uses
    3. M70 amd M75 concrete strength

  • ashok August 24, 2010 at 11:00 am

    hi guys… I am currently in need of design manual for The FIBRE REINFORCED CONCRETE.. can any one please help me .

  • Post a comment

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