If you have travelled through a coal-mining region, you have probably seen the huge trucks that pass through these roads every day, carrying tonnes of coal and other mined material.
Over time, that kind of weight takes a toll. Roads crack, wear out faster and need frequent repairs.
Now, researchers at NIT Rourkela have found an interesting way to tackle the problem. They have developed a high-strength material using coal-mining waste, fly ash and a binder, which could one day be used to build roads strong enough to handle heavy truck traffic.
The idea is simple: use waste from mining and industry to help build better roads in the very regions that produce it.
What if coal waste could help build roads?
India mines around one billion tonnes of raw coal every year to meet its energy and industrial needs, according to the Ministry of Coal. Nearly 94% of this comes from surface mines, which generate large quantities of waste.
One such waste is coal parting material — rock and other non-coal material separated during mining. Conventionally disposing of this waste puts considerable pressure on the environment.
NIT Rourkela team saw an opportunity in what was being discarded.
Coal mine parting, a waste material separated during mining, could find a new purpose in infrastructure instead of ending up as a disposal challenge.
Photograph: (NIT Rourkela & Down To earth)
Coal mine partings contain minerals such as silica and alumina, along with clay minerals that have properties including compressive strength and stiffness. The researchers explored how these properties could be put to use in construction.
They developed a composite by combining coal mine parting, fly ash and a binder, and tested different formulations to identify a mixture with the required strength and performance.
Can it handle the weight of heavy trucks?
The need for such a material is particularly relevant in coal-mining regions, where roads regularly carry heavy vehicles transporting mined materials.
“The developed technology is particularly relevant to coal-mining regions, where roads routinely carry heavy vehicles transporting mined materials,” says Prof K. Umamaheshwar Rao, Professor and Director, NIT Rourkela. “Such roads are exposed to significant loads and repeated traffic, resulting in frequent deterioration.”
The innovation, therefore, aims to address two challenges at once: finding a productive use for large volumes of mining and industrial waste while creating infrastructure that can better withstand demanding conditions.
The research team comprises Prof K. Umamaheshwar Rao, Dr Manoj Kumar Mishra and research scholar Dr Subhasrita Chodhury from the Department of Mining Engineering, NIT Rourkela. The technology has been granted Patent No. 597749, under Application No. 202331070306.
Taking the idea from the lab to real roads
Beyond road construction, the researchers see the development as an example of how waste from one industrial process can become a useful resource elsewhere.
Mining waste could soon help build stronger roads in the very regions where it is generated, turning a waste challenge into an infrastructure solution. Photograph: (Bio Powder)
“The developed composite is a classic example of the circular economy principle,” says Prof Manoj Kumar Mishra. “We have used two industrial wastes of huge volume into a resource with significant engineering potential and economic value.”
According to him, the material could help address waste-management concerns while supporting more sustainable infrastructure development using locally available resources.
With pilot-scale field trials now planned, the researchers hope to take this innovation from the lab to real-world roads, where they can assess its long-term strength and durability. It is a promising example of how India’s waste streams can be reimagined as resources for building stronger, more sustainable infrastructure.
