India has paved a kilometre of highway with a bitumen mix that uses processed steel slag as the aggregate instead of gravel.
The Ministry of Science and Technology said steel slag has superior mechanical properties, and is 32% cheaper to use.
It added that the steel slag section was 28% thinner than conventional paving.
Indian conglomerate JSW Steel carried out the project guided by CSIR-Central Road Research Institute for the National Highways Authority of India.
The company used 80,000 of Conarc steel slag to pave a section between Indapur and Panvel on National Highway 66 running between Mumbai and Goa.
The project showed the potential of “transforming the waste of steel industries into wealth”, the ministry said.