Properties of Concrete
There are various properties of concrete in construction. What are the 6 properties of concrete? While the list below provides more than six, it’s essential to know the core properties.
They are as follows-
- Grades of Concrete (M20, M25, M30, etc.)
- Compressive Strength of Concrete.
- Characteristic Strength of Concrete.
- Tensile Strength of Concrete.
- Durability of Concrete.
- Creep of Concrete.
- Shrinkage of Concrete.
- Unit Weight of Concrete.
- Modular Ratio of Concrete.
- Poisson’s Ratio of Concrete.
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1. What Is the Grade of Concrete
In the measurement MPa, the grade of concrete is expressed.
Where the M stands for mix and the MPa expressed the overall strength of the concrete.
For example for the M20 grade of concrete, Where the M stands for mix and 20 means the maximum compressive strength achieves by the concrete 20N/mm2 at 28 days.
The size of the cube upon which the compressive strength test is done is 150 X 150 X 150 mm.
Different Types Grade of Concrete Is Below
Characteristic Compressive Strength Fck at 28 Days
|High Strength Concrete||
2. The Compressive Strength of Concrete
A quality that varies considerably for the same concrete mix Like a load, the strength of the concrete is also.
3. Characteristic Strength of Concrete
The characteristic strength of concrete is the compressive strength in the cube test of concrete.
In technical word, there is only 5% failure chance of concrete in it’s characteristic concrete.
The target mean strength (Fcm) = fck+(k x s)
- Fck=characteristic strength
- K=1.65 (constant)
- S=standard deviation of concrete cube
4. Tensile Strength of Concrete
The tensile strength of concrete, one of the basic and important properties is which greatly affect the extent and size of cracking in structures.
The concrete is very weak due to its brittle nature in tension. Hence the direct tension is not expected to resist.
When tensile forces exceed their tensile strength the concrete develops cracks.
Furthermore, to determine the tensile strength of splitting tensile strength test on the concrete cylinder is a method concrete.
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5. The Durability of Concrete
To resist its disintegration and decay the durability of concrete is its ability. Influencing the durability of concrete is one of the chief characteristics.
By having adequate cement, the desired low permeability in concrete is achieved, by ensuring full compaction of concrete and by adequate curing sufficient low water/cement ratio.
6. Creep of Concrete
7. Shrinkage of Concrete
If this strain is prevented, hence concrete develops cracks and produces tensile stress in the concrete.
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8. Unit Weight of Concrete
The unit weight of reinforced concrete and plain concrete as specified by IS:456 are 24 and 25 KN/m3
9. Modular Ratio of Concrete
The short-term modular ratio is the modulus of elasticity to the modulus of elasticity of steel of concrete.
The effects of creep and shrinkage are taking into account partially IS code gives the following expression for the long-term modular ratio.
Where, fcbc = permissible compressive stress due to bending in concrete in N/mm2
Long term modular ratio (m) = 280/ (3fcbc).
10. Poisson’s Ratio of Concrete
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