IMPORTANCE OF A GOOD CONCRETE MIX DESIGN
A good mix design creates the formation of a sound structure. So, designing the concrete mix design plays are vital role in defining the quality of concrete manufactured. The strength & the properties are based on the concrete mix design. So, if the concrete mix is not designed properly it may lead to the failure of the structure. A good mix design assures that the structure built, will be strong enough & will prevent failure.
FACTORS AFFECTING THE CONCRETE MIX DESIGN
There are a few factors that affect the strength & durability of the concrete mix design ratio. They are as follows:
1. SELECTION OF CEMENT
There are various types and brands of cement available in the market. It is important to select a quality of cement that suits the best for the required grade of concrete, hence does not affect the quality of concrete.
2. SELECTION OF AGGREGATES
Different mix does have different properties. These properties are due to the types of materials used in it. So, the selection of aggregates of different types depends upon the physical property required for the concrete mix design.
3. TYPES OF WATER USED
The types of water used for mixing the material to form concrete should not be contaminated. It should be clean & free from all the impurities that harm the concrete.
4. WATER – CEMENT RATIO
The water-cement ratio is specified for a particular grade of concrete. If that ratio is not maintained accordingly, then the quality of concrete may get affected in terms of workability, slump & compaction factor.
5. WORKABILITY OF CONCRETE
The workability of concrete defines the consistency of concrete. The workability of concrete is due to the amount of water added to it. Approximately 2-3% of the variation in water quantity can cause a variation of 20mm in a slump, which would affect the strength of concrete by 2n/mm^2.
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The workability of concrete defines the consistency of concrete. The workability of concrete is due to the amount of water added to it. Approximately 2-3% of the variation in water quantity can cause a variation of 20mm in a slump, which would affect the strength of concrete by 2n/mm^2.
6. DURABILITY OF CONCRETE
Durability is defined as the ability to resist deterioration due to an aggressive environment. The proportion of each material is responsible for the durability of concrete.
ADVANTAGES OF CONCRETE MIX DESIGN
Good Quality: The quality of concrete obtained is better than the nominal mix as the ratio of the quantity of materials is accurate & hence the required strength of concrete can be achieved.
Economical: The nominal mix having no fixed amount of ratio for material, may sometimes suggest more cement on the other hand the design mix gives a fixed quantity of cement & other materials. So that difference. So that difference helps to save as much as 15 to 20% of the cost.
Using the mix design, one can achieve the desirable properties of concrete such as workability, strength, durability, and setting time.
DISADVANTAGES OF CONCRETE MIX DESIGN
It requires a set of skilled workers for its manufacturing as accuracy is needed while the concrete is made.
1. It needs specific attention while it is being prepared. If the desired properties are not achieved, then it may result in the adversity of the structure.
2. The initial cost of mix design is higher.
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