Tensile Strength Test of Stones (IS: 1121 (Part III))
- A testing machine of sufficient capacity for the tests and capable of applying load at the specified rate should be used.
- Take three cylindrical test pieces of diameter greater than or equal to 50 mm.
- The ratio of diameter to height should be 1:2 for the test pieces.
- The testing machine should be equipped with two steel plates of width 25 mm, thickness 10 mm and length equal to the length of the test piece.
- These test pieces are used to determine the tensile strength of the stone in each saturated(immersed in water at 20 to 30°C for 3 days) and dry condition(dried in an oven at 105±5°C for 24 hours and cooled in a desiccator to 20 to 30°C room temperature).
- Each test piece to be tested is sandwiched between two steel plates of the dimensions mentioned above.
- Now, the load is applied without shock and increased continuously at a uniform rate until the specimen splits and no greater load is sustained by it.
|Image From Book By S.K. Duggal|
- Then, the maximum load applied to the specimen is recorded.
- Finally, the Split Tensile Strength(S) of the stone under observation is calculated by using the formula specified below:-
|Split Tensile Strength|
where S=split tensile strength (N/mm2)
d=diameter of specimen(mm)
L=length of specimen(mm)
- The average of three results separately for each condition should be recorded as the split tensile strength of the sample.
- In any case, if any test piece gives a value of as much as 15% below the average, it should be examined for defects and if found defective the test piece should be rejected.
|Mind Map for Tensile Strenght test on stones|
*Source- Internet, Books, Self-Analysis