The AASHTO T 283 method involves conducting tests on a comparable set of specimens in an original (unconditioned) state and after conditioning and then comparing the results. In some literature this test is also called the modified Lottman test.
Appropriately prepared specimens are divided into two sets. One set is designed for testing without conditioning, while the other is subjected to conditioning in water and freezing. Both the original and conditioned specimens are tested with an indirect tension apparatus. The ratio of the conditioned tensile strength to the strength of the original specimens is called tensile strength ratio (TSR). TSR is usually required to be greater than 70% or 80% (most often 80%).
