Mix design is a process of selecting suitable ingredients and determining their relative proportions with the objective of producing concrete of having certain minimum workability, strength and durability as economically as possible.
- Concrete
A mix design can be designed in two ways as explained below
- Nominal Mix
- Design
Nominal Mix
It is used for relatively unimportant and simpler concrete works. In this type of mix, all the ingredients are prescribed and their proportions are specified. Therefore there is no scope for any deviation by the designer. Nominal mix concrete may be used for concrete of M-20 or lower. The various ingredients are taken as given in the table below
|
Grade |
Max. quantity of dry Aggregates per 50 kg of cement |
Fine Aggregate to Coarse Aggregate Ratio, by mass |
Max. Quantity of water in litres |
|
M-5 |
800 |
Generally 1:2 but may varies from 1:1.5 to 1:2.5 |
60 |
|
M-7.5 |
625 |
45 |
|
|
M-10 |
480 |
34 |
|
|
M-15 |
330 |
32 |
|
|
M-20 |
250 |
30 |
Design Mix
It is a performance based mix where choice of ingredients and proportioning are left to the designer to be decided. The user has to specify only the requirements of concrete in fresh as well as hardened state. The requirements in fresh concrete are workability and finishing characteristics, whereas in hardened concrete these are mainly the compressive strength and durability.
Im going through your blog and find out more and more valuable content. thanks a lot.
How to carried out des
What is correct definition of clear cover ?
Sir M35 ke liye or batana plz isme concrete ka ratio kitna Lena h pllllllzzzzzzzz
PLEASE LET ME KNOW IN WHICH IS CODE IT WAS MENTIONED THAT DRY VOLUME SHOULD BR TAKEN 1.54 CUM FOR 1 CUM WET VOLUME ?
IS : 456 may be
IS 10262:2009
mix design
What is controlled mix?
Sir please answer me
What is nominal mix and design mix
I am civil engineering any new in civil project send me email plz
Sir m new hu ..plz kya ap mjhko thodi help krdoge mjhko jada knwledge nai h jb jb appe time ho thode samjha dia krna
Sir , How you calucalated it .. Can you explain in Briefly ??
Thanking You Sir
sir m confused bcz wht vis 1.54 ratio. nd i read in my book building material 1.54 in a ratio of cement in dry waait of 1cum but how plz snd my reason hoiw calculate in 1.54 ratio used in cement dry weight
For dry material of cement concrete using 52 to 55 % extra of volume of concrete. For example : aapko 1:3:6 ratio ki cement concrete use krni h or uska(concrete) volume 10cum h to aap dry mortar find krne k liye is volume m 54% extra lenge ,10+10*54/100=10+5.4= 15.4 cum.
Then isme cement ki quantity nikalne k liye ,15.4/(1+3+6)*1=1.54 cum cement
Similarly for send , 15.54*3/(1+3+6)=4.66 cum and aggregate= cement qty.* 6=9.24 cum
Aapko 10cum 1:3:6 ratio ki concrete bnane k liye itne dry materials ki jrurat pdegi..
What is the important of voids in mix design?
why not we are make a nominal mix above m-20.?
Because nominal mixes don’t take the ingredients characteristics into account ( Specific Mass, Volume , strength,,,etc) which vary from one patch to other, That’s why they are for “less important” mixes.
Sir
I am one of the civil engineer worked in NPCC in the past but any how as I draw to your kind attention I am having some doubts in civil engineering subject can u pl explain them first of all SF and BM Driagrams of all possible loads and supports secondly how to design slabs beams and columns in limit state method with complete notes and lastly how to calculate quantity of aggregates in M15 M20 etc for 1 cum of concrete
You may pl e mail me
Thanking You
gradients ratio in m-15, 1:2:4
then coefficient 1.52
quantity of cement – 1.52/7=.217m3 x28.8=6.25bags
quantity of sand -2x.217=.434m3x1600=694.4kg.
quantity of aggregate 10&20= 4x.217×1650=1475.6kg