Concrete Mix Design Calculation as per IS Code means the Government of Indian release guidelines for concrete strength and quality control. Indian standard code gives proper guidelines and methods for designing concrete mix to get proper strength of concrete.
What is Concrete Mix?
Mix design can be defined as the method of calculating suitable quantity of materials of concrete and find out the required proportions with the object of producing concrete of certain minimum strength and durability as economically as possible.
Concrete Mix Design is a process of calculating the quantity of materials like cement, sand, aggregate, water, and admixtures to achieve or make specified strength of concrete.
In simple words, the method of calculating materials quantity that make required grade of concrete.
The concrete mix design is not easy task considering the widely varying properties of the constituent materials, the conditions that prevail at the site of work, in particular the exposure condition and the conditions that is essential for different construction work for which the mix is designed.
Design of concrete mix demands deep knowledge of concrete materials properties; these make the task of mix design more complex and difficult.
Design process of concrete mix required deep knowledge material properties and properties of concrete in plastic condition; it also needs wider knowledge and experience of concreting.
Even the quantity of materials of concrete calculated in laboratory requires modification and re adjustments to suit the field conditions.
Concrete Mix Design Example as per IS Code – 10262: 2019
The Bureau of Indian Standards recommended a set procedure for the design of concrete mix mainly based on the work done in national laboratories. The mix design procedure is covered in IS 10262: 2019. The methods can utilize for both medium strength and high strength concrete.
Data Required for Mix Proportioning:
tep – 7 Mix Calculation for 1 m³:
Material quantity calculation for concrete mix design as per IS Code – 10262 : 2019,
A) Volume of concrete = 1 m³
B) Volume of Air Content wet concrete = 0.01m³
C) Volume of cement = [Mass of cement] / {[Specific Gravity of Cement] x 1000}
= 318/{3.15 x 1000} = 0.1 m³
D) Volume of water = [Mass of water] / {[Specific Gravity of water] x 1000}
= 197.15/{1 x 1000} = 0.197 m³
F) Volume of all in aggregate = [(A-B)-(C+D)]
= [(1-0.01)-(0.100+0.197)]= 0.99-0.297
= 0.693 m³
G) Weight of coarse aggregate= E x Coarse Aggregate Volume x Specific Gravity of coarse Aggregate x 1000
= 0.693 x 0.60 x 2.795 x 1000
= 1162.16 kg/m³
H) Weight of fine aggregate= E x Volume of Fine Aggregate x Specific Gravity of Fine Aggregate x 1000
= 0.693 x 0.46 x 2.517 x 1000
= 802.36 kg/m³
MIX Proportion by Volume:
Cement = 318 kg/m³
Water = 197.15 Liter/m³
Fine aggregate = 802.36 kg/m³
Coarse aggregate 20 mm = 1162.16 x 60 %= 697.29 kg/m³
Coarse aggregate 10 mm = 1162.16 x 40 %= 464.86 kg/m³
Water-cement ratio = 0.62
Weight of Materials for 1 Bag ( 50 kg) Bag of Cement:
We know that volume of 50 kg bag of cement is 0.035 m³. so if we divide weight of cement for by volume of 1 bag of cement we will get number of bags of cement required for making 1 cubic meter of concrete.
Cement = 318 kg / 0.035 = 11.13 Nos. of Bags
Now divide all other quanitity by 11.13 to get materials quantity for 50 kg or 1 bag of cement
Fine Aggregate (Sand) = 802.36 / 11.13 = 72.08 kg
Coarse Aggregate ( 20 mm) = 697.29 / 11.13 = 62.64 kg
Fine Aggregate (10 mm) = 464.86 / 11.13 = 41.76 kg
Water = 197.15 / 11.13 = 17.71 liter.
