Indirect tensile test on cylindrical specimens IT-CY

The diameter of the specimen to be tested could be 80, 100, 120 150 or 200 mm and the height could be between 30 and 75 mm. Both dimensions are chosen relative to the nominal maximum aggregate size of the mixtures. The most common dimensions of specimens are 100 or 150 mm in diameter and 40, 50 or 60 mm in height. 

The test is typically performed at a temperature of 20°C 0.5°C, but any other temperature, usually less than 20°C, may be used. The temperature during testing should be kept constant thus, the testing device is placed in an appropriate climatic/temperature chamber. 

After placing the specimen and before starting to record the results, at least 10 conditioning load pulses (pre-loading) are applied, in order to enable the equipment to adjust the load magnitude and duration to give the specified horizontal transient (diametral) deformation and time. 

After the conditioning load pulses, five more load pulses are applied, during which the applied load and the resulting horizontal deformation are recorded. For each load pulse, the stiffness modulus is determined using the following equation  

After completing the above procedure, the specimen is rotated by 90 10 , and the same procedure for determining the stiffness modulus is repeated in this new position. 

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