Properties of Concrete : (Part-1) _ STRENGTH PARAMETER #2

1. Properties in Strength Parameter:  #2

          After knowing Compressive Strength and Tensile strength of concrete, it is mandatory to know about the Characteristic Strength of concrete.

    C. CHARACTERISTIC STRENGTH OF CONCRETE: It is defined as the value of the strength of concrete below which not more than 5% of the test results are expected to fall. This may be for both Cylinder and Cube.

 

• Partial Factor of Safety: Factor of Safety is defined as the ratio of  "Load carrying capacity of a member to the Load on the member."

Factor of safety (f) = (Load carrying capacity of a member)/(load on the member)

• This is generally used in Limit State Method.

• Types of Factor of Safety: 
• Partial Factor of Safety for LOAD
•  Partial Factor of Safety for MATERIALS.

For Detailed Information about Partial Factor of Safety, kindly check it out in 

IS 456: 2000- Clause 36 of Page No.: 67 

• Characteristic Strength of Member/Cube = Compressive Strength (fck)
• Characteristic Strength of Structure = 0.67 * Compressive Strength (fck) = 0.67 * fck

• Design Strength:  The Strength to be taken for the purpose of "Design" is well known to be Design Strength parameter.

Design Strength (Fd) =  ( Characteristic Strength of structure) /(Partial Factor of Safety of material)

• Design Strength = (0.67 * fck) / (1.5) = 0.45 * fck