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

Transverse Strength Test of Stones (IS: 1121 (Part II)

Stones

Requirements:-

• Test pieces should be blocks of the size of 200 mm * 50 mm * 5 mm.

• A suitable form of apparatus is required to perform the tensile strength test on stones.

Procedure:-

• These test pieces are used to determine the transverse 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). 

• Each specimen piece is supported upon two self-aligning bearers A and B(40 mm in diameter each) and the distance between centres of bearers being 150 mm.

• Bearer A is supported horizontally on two bearer screws C, which carry hardened steel balls D.

• Bearer B is supported on one such screw and ball.

Image From Book By S.K. Duggal

• The load is then applied centrally on the specimen piece at a uniform rate of 2 kN/min through a bearer E(40 m in diameter) placed midway between the supports upon the upper surface of the specimen S and parallel to the supports.

• The Transverse Strength(R) of the specimen is given by:-

Transverse Strength

           where R=Transverse Strength in N/mm2
       
           W= Central breaking load in N
       
           L=Length Of Span in mm
       
           b= Average Width in mm of the test piece at the midsection
       
           d=Average Depth in mm of the test piece at the midsection
                 
           

• The average of three results(separately for saturated and dry condition) should be taken to determine the transverse strength of the stone. 

Precaution:-

• If any test piece is giving result as much as 15% below the average value, it should be examined for defects.

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