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The characteristic strength of concrete in the actual structure is taken as:
- a)fck
- b)0.85 fck
- c)0.67 fck
- d)0.447 fck
Correct answer is option 'C'. Can you explain this answer?
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The characteristic strength of concrete in the actual structure is ta...
For design purposes, the compressive strength of concrete in the structure shall be assumed to be 0.67 times the characteristic strength. The partial safety factor = 1.5 shall be applied in addition to this.
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Hence the option C is correct.
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The characteristic strength of concrete in the actual structure is ta...
Characteristics Strength of Concrete
The characteristic strength of concrete is the strength of the material below which not more than 5% of the test results are expected to fall. It is used to determine the structural design of a concrete element.
Formula: fck = fck + 1.65s
Where,
fck = characteristic compressive strength of concrete
s = standard deviation
The standard deviation for concrete is generally 5 MPa. Therefore, the characteristic strength of concrete in the actual structure is taken as 0.67 fck.
Explanation:
The value of 0.67 fck is used in structural design calculations to ensure that the element can withstand the expected loads without failure. This value is obtained by multiplying the characteristic strength of concrete by a factor of 0.67. This factor is used to account for the variations in strength that can occur due to factors such as the quality of materials used, the mixing and curing processes, and the conditions under which the concrete is placed.
The value of 0.67 fck is also used to determine the grade of concrete required for a particular application. For example, if the required compressive strength of concrete for a particular application is 30 MPa, then the grade of concrete required would be M40, which has a characteristic strength of 40 MPa.
Conclusion:
In conclusion, the characteristic strength of concrete in the actual structure is taken as 0.67 fck. This value is used in structural design calculations and to determine the grade of concrete required for a particular application.
The characteristic strength of concrete is the strength of the material below which not more than 5% of the test results are expected to fall. It is used to determine the structural design of a concrete element.
Formula: fck = fck + 1.65s
Where,
fck = characteristic compressive strength of concrete
s = standard deviation
The standard deviation for concrete is generally 5 MPa. Therefore, the characteristic strength of concrete in the actual structure is taken as 0.67 fck.
Explanation:
The value of 0.67 fck is used in structural design calculations to ensure that the element can withstand the expected loads without failure. This value is obtained by multiplying the characteristic strength of concrete by a factor of 0.67. This factor is used to account for the variations in strength that can occur due to factors such as the quality of materials used, the mixing and curing processes, and the conditions under which the concrete is placed.
The value of 0.67 fck is also used to determine the grade of concrete required for a particular application. For example, if the required compressive strength of concrete for a particular application is 30 MPa, then the grade of concrete required would be M40, which has a characteristic strength of 40 MPa.
Conclusion:
In conclusion, the characteristic strength of concrete in the actual structure is taken as 0.67 fck. This value is used in structural design calculations and to determine the grade of concrete required for a particular application.
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The characteristic strength of concrete in the actual structure is taken as:a)fckb)0.85 fckc)0.67 fckd)0.447 fckCorrect answer is option 'C'. Can you explain this answer?
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