In this paper IS code method is used to determine the optimum bitumen content for the given samples of different
roads of subtropical climate zone of India. The analysis and testing has been done as per IS code- IRC: SP 11-1988 (Appendix5) and ASTM D 2172. According to this IS code, all the samples should be tested in the lab with the help of bitumen extractor
machine for the same five disturbed samples of bituminous intercity road of subtropical climate conditioned road has been
collected from Gwalior city. The results of samples are compared together and with the actual gradation % of bitumen content
described in IS-code
