The split tensile test is directly used to measure what property of concrete?

The split tensile test is specifically designed to measure the tensile strength of concrete. In this test, a cylindrical concrete specimen is subjected to a diametric compressive load which generates tension within the specimen. This method allows for the estimation of tensile strength since concrete is known to have low tensile strength compared to compressive strength.

By applying tensile stress through compression across the diameter, the test leverages the geometry of the cylindrical sample, generating diametrical stresses that lead to failure. The results obtained from this test provide valuable insights into the material's performance, especially in situations where tensile stresses are expected, such as in the flexural response of beams or slabs.

While compressive strength is typically measured through a different method, such as the standard cube or cylinder compression test, the split tensile test focuses solely on tensile properties. Thus, the correct answer reflects the fundamental purpose of this testing procedure in characterizing concrete materials.