FLEXURAL STRENGTH TEST OF CONCRETE (IS:516-1959)



        Hi friends, you are welcomed in the world of Civil Allied Gyan. In this article I have explained about flexural strength test of concrete.

By the help of this blog you can easily test the flexural strength of concrete. So please continue to the end & keep your love and support on me.

  • IS: 516- 1959

APPARATUS REQUIRED FOR THE TEST:-
  • Compressive testing machines 
  • Bean mould (10×10×50) cm³ or (15×15×70) cm³

https://civilalliedgyan.blogspot.com/2020/04/flexure-test-for-admixture-specimen.html
Compression Testing Machine


PROCEDURE OF THE TEST:-
  1. At first, store the test specimens in water at a temperature of 24°C to 30°C for 48 hours before testing.
  2. Test the specimens immediately on removal from the water while they are still in a wet condition.
  3. Note down the dimension of each specimens before testing.
  4. Wipe cleanly the bearing surfaces of the supporting and loading rollers. Also remove any loose sand or other material from the surface of the specimen where they are to contact with the rollers.
  5. Place the specimens in the testing machine in such a manner that the load shall be applied to the uppermost surface as cast in the mould, along two lines spaced 20.0 cm or 13.3 cm apart.
  6. Align carefully the axis of the specimen with axis of the loading device. No packing should be used between the bearing surface of the specimen and the rollers.
  7. Apply the load with thought shock and increase it continuously at a rate such that the extreme fiber stress increases at approximately 7 kg /cm²/ min.
  8. Approximately 7 kg /cm² /min that is at a rate of loading of 400 kg/min for the 15.0 cm specimen and at a rate of 180 kg /min for the 10 cm specimen load shall be increased during the test shall be recorded.


CALCULATION:- 
                  
/2020/04/flexure-test-for-admixture-specimen.html

Where,          
P = Maximum load in kg applied to the specimen,      
L = Length (in cm) of span on which the specimen was supported,
b = Measured width (in cm) of the specimen,
d = Measured depth (in cm) of the specimen at the point of failure.