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The mix design M-40 grade for Pier (Using Admixture – Fosroc) 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 M40

Type of cement = O.P.C-43 grade
Brand of cement = Vikram ( Grasim )
Admixture = Fosroc ( Conplast SP 430 G8M )
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 = 40 + (5 X 1.65) = 48.25 Mpa

2. Selection of water cement ratio:-
Assume water cement ratio = 0.4

3. Calculation of cement content: –
Assume cement content 400 kg / m3
(As per contract Minimum cement content 400 kg / m3)

4. Calculation of water: –
400 X 0.4 = 160 kg Which is less than 186 kg (As per Table No. 4, IS: 10262)
Hence o.k.

5. Calculation for C.A. & F.A.: – As per IS : 10262 , Cl. No. 3.5.1

V = [ W + (C/Sc) + (1/p) . (fa/Sfa) ] x (1/1000)

V = [ W + (C/Sc) + {1/(1-p)} . (ca/Sca) ] x (1/1000)

Where

V = absolute volume of fresh concrete, which is equal to gross volume (m3) minus the volume of entrapped air ,

W = mass of water ( kg ) per m3 of concrete ,

C = mass of cement ( kg ) per m3 of concrete ,

Sc = specific gravity of cement,

(p) = Ratio of fine aggregate to total aggregate by absolute volume ,

(fa) , (ca) = total mass of fine aggregate and coarse aggregate (kg) per m3 of
Concrete respectively, and

Sfa , Sca = specific gravities of saturated surface dry fine aggregate and Coarse aggregate respectively.

As per Table No. 3 , IS-10262, for 20mm maximum size entrapped air is 2% .

Assume F.A. by % of volume of total aggregate = 36.5 %

0.98 = [ 160 + ( 400 / 3.15 ) + ( 1 / 0.365 ) ( Fa / 2.61 )] ( 1 /1000 )

=> Fa = 660.2 kg

Say Fa = 660 kg.

0.98 = [ 160 + ( 400 / 3.15 ) + ( 1 / 0.635 ) ( Ca / 2.655 )] ( 1 /1000 )

=> Ca = 1168.37 kg.

Say Ca = 1168 kg.

Considering 20 mm : 10mm = 0.6 : 0.4

20mm = 701 kg .
10mm = 467 kg .

Hence Mix details per m3

Cement = 400 kg
Water = 160 kg
Fine aggregate = 660 kg
Coarse aggregate 20 mm = 701 kg
Coarse aggregate 10 mm = 467 kg
Admixture = 0.6 % by weight of cement = 2.4 kg.
Recron 3S = 900 gm

Water: cement: F.A.: C.A. = 0.4: 1: 1.65: 2.92

Observation: –
A. Mix was cohesive and homogeneous.
B. Slump = 110mm
C. No. of cube casted = 12 Nos.
7 days average compressive strength = 51.26 MPa.
28 days average compressive strength = 62.96 MPa which is greater than 48.25MPa

Hence the mix is accepted.

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

### Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

If you have a query, you can ask a question here.

RAVI says:

i want the mix design for m70 grade concrete using aci method and m60 in is method

sabir says:

i would please to know whether concrete of M40 grade can be prepared the use of sunanda admixture?

Bharat says:

Sir,Please send me the mixing ratio design of Fly ash bricks containing fly ash, gypsum, lime, river sand & conplast hardner solution.
Thanking you,
Bharat Patel

Thulani says:

what ratio to be to get 15mpa / to get 20mpa / 25mpa

Gopal says:

Ratio for M15, 20 annd 25 are 1:2:4, 1:1.5:3 and 1:1:2

VIJAYKUMAR PATIL says:

What is the main role of chemicals in concrete?

Kufre Antia says:

Sir, u’ve given us ratios for M20(0.4:1:1.65:2.9) but i have seen another mixing ration for the same M20(1:2:4). What is causing this iregularities?

firoz says:

sir,
please send me the concrete mix design procedure.

PARMJIT SINGH BHARAJ says:

sir
i want to know compressive strength Pc Beam of m-40,Pt Beam m-50 grade at 28days asper is IS
regards,
PARMJIT SINGH BHARAJ

Send mix ratio. For conncret. is456 m15,20,25,30,35,40

jawahar rajput says:

1 cum/ft = how many litter in grade m 40. (in crush sand )

Please suggest a design mix for M-50 grade paver blocks 100mm thick, with cement content of 325 kg and stone dust.

Prapann Shukla says:

Pls all correction to according the mix design send me.

vinoth says:

i need c4o grde opc mixe design

VINOD says:

Mulji Gohel says:

Sir, i want mix design with flyash with full calculation.

karnani says:

Sir, there is information available on various mix design for the concrete.
It is mainly for the construction.
I am looking for the information of concrete mix for making Pavers in various grades.
There are two type of machines making Paver blocks:-
a) Hydralic press
b) Vibro press
what mix recommended to make concrete pavers for Grade M-30.
Is it different in different machines as mentioned above.

khulekani says:

I want a mix design for blocks and bricks i want to manufacture them.

Varish says:

sir, i want information about brick. How much brick use in 1 m.cu. ?

sir iwant clarification of using stone dust for concrete,pcc,rcc,mortor.what proportion to use please give me your advice thankyou

srinivasan says:

Sir
I need some clarification
1.Mix calculation
1.Target Mean Strength = 40+(5×1.65)
What u mean 5×1.65
Thanking you