ASTM D490-92 (R2016) PDF Download

The ASTM D490-92 (R2016) standard is titled "Standard Specification for Road Tar" and it covers 14 different grades of road tar. These grades are RT-1, RT-2, RT-3, RT-4, RT-5, RT-6, RT-7, RT-8, RT-9, RT-10, RT-11, RT-12, RT.C.B.-5, and RT.C.B.-6.

The specification outlines the requirements that the tar must meet in terms of various properties. These properties include water content, specific gravity, specific viscosity, distillate content, softening point of residue from distillation, and total bitumen soluble in carbon disulfide.

To ensure compliance with the specification, specific test methods are provided. These include Engler and float tests, distillation test, and ring-and-ball test. These tests are used to determine the values for the different properties mentioned in the standard.