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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.

balwinder singh says:

please sir reply design of M30 M35 M40 on paver block/interlocking tyle 60MM thick

Mohan.g says:

I want to know m40 grade Ratio for making 80 mm concreate paver block , so please send me details.

AJAY says:

EXACT RATIO 1:1/5:3

S.M.Govardhan says:

sir, please specify the M 40 ratios approximately as per IS 10262:2009

jamil says:

How Calculate by volume. Please send email thanks

MURUGAN.S says:

dear sir i want mauvel mix m40 grade of concrete in apartment building

swapnil varpe says:

SIR, GIVE GUIDANCE HOW WE WILL DESIGN FOR HIGH STRENGTH CONCRETE LIKE M-60,M-80 ACTUALLY I WANT DEVELOP HIGH STRENGTH CONCRETE BY USING LOCALLY AVAILABLE MATERIAL

PRAVEEN says:

sir iam planning to manufacture 80mm zig zag interlocking economy pavers to use in petrol pumps, with m40 strength,kindly suggest what is the ratio of cement:rock powder:6mm&8mm chips with how much hydraulic pressure is required. pl. suggest

vp says:

how to calculate batching plant mix design concrete

Hansraj Pawar says:

Hello Sir, Please specify mix design of M40 with Fly ash & use OPC 53 grade

Zeyauddin says:

How to calculate mix design for interlock paving block M30?please explain me detail.send my mail

gordon wright says:

I am working on a tunnel project in North Africa manufacturing precast tunnel segments there are problems with the concrete mix and I can not convince the management of the problems,there is excessive bleeding on the surface,many bugholes and the strength of 20 mpa after three days is very low.My opinion is either too much silica,too many fines in the sand and also dirty aggregate.Please see the attached mix design below
C45
SLUMP . 200mm
W/C RATIO 0.31%
CEMENT CEMEX111A/50%/50% slag
CEMENT 470kg
SILICA FUME 40kg
TOTAL 510kg
FREE WATER 159kg
SAND 0-5mm 772kg
AGGREGATE 5-20MM 900kg
ADD MIXTURE PANTRAHIT PC180 Ha Be
POLYFIBERS 6mm 2KG
All the information is from the original mix design as KG/CU. M.
They are not good at listening to advice so any help would be greatly appreciated
regards Gordon Wright

Azimkhan and shirish shah says:

dear sir, how to design M:40 with cement 53 grade, crushed sand (different sieve no) and permissible admixture to pressure grout for micro piling.

Azimkhan and shirish shah says:

dear sir, I want m:40 design with port land cement 53, crushed sand (sieve no.) and permissible admixture to be used by pressure grout for micro piling.

dheeraj kumar says:

Pl send me M40 Grade of concrete cover block ratio

sachin kotame says:

How to calculate mix design for 3 block by this proportion (1:1.65:2.92)

??ng Khoa says:

Dear sir,
Sir i have just started the manufacturing unit of paving blocks brick will you please send me the design for M15,M20, M25,M30,M35,M40 & M45 BY USING PCB40, Fly ash type F.
Thank you Sir

Sourav pal says:

Sir,
I want to manufacture 60mm paver block.what will be the mix proportion of M30 by 6mm stone , sand and ppc 53grade cement and admixture

Dear sir

I am starting a concrete interlocking block and fly ash brick can you send me the correct mix design with fly ash for m3 of semi dry mix for the above mentioned products.
type mixer in my factory
Rolling pan mixehar
Warm Regards