Tensile Strength Test of Stones | Crushing Test of Stones | Stones | Construction Materials | By Ashutosh Nautiyal and Akhand Dutta

Tensile Strength Test of Stones (IS: 1121 (Part III)) 

Stones

Requirements:-

• 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.

Procedure:-

• 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)
     
          W=applied load(N)

          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.

Precaution:-

• 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

*Self Typed
*Source- Internet, Books, Self-Analysis