STAR® Technology

Sustainable Materials

With the STAR® Process, coal ash is transformed into a high-quality, sustainable material for concrete, reducing the amount of other natural resources needed in construction. Since structures built with fly ash concrete will last longer, fewer resources will be depleted in the future. Using fly ash in this way exemplifies sustainable development.

STAR® Ash contributes environmental benefits to concrete producers and facility owners:

  • Lower Greenhouse Gas emissions result from the reduction of demand for Portland cement. For every ton of fly ash used there is roughly a 1-ton reduction in CO2 emissions that otherwise result from the manufacture of Portland cement.
  • Reduced use of virgin resources resulting from the reduced production of cement which requires the mining of limestone and shale.


Best Practice

STAR® Technology is a stand-alone solution that is cost-effective and eliminates long-term liability. Coal ash is transformed so it can be recycled and encapsulated in concrete. This beneficial use meets all environmental agency requirements for coal ash usage.

Permanent Solution

Once transformed into a concrete matrix, any contaminants in coal ash are locked up forever. The elimination of ash storage facilities means the elimination of the need for long-term monitoring of wells and structures to detect and prevent ground water pollution.


The STAR® Technology solution to coal ash pond closure is an environmentally sustainable option that offers decades of multiple benefits. Reclaiming coal ash from ponds, and processing it into high-quality, consistent material allows it to be recycled for beneficial use in concrete.

Transformative Sustainability

Embedded In Our Culture

SEFA has recycled over 20 million tons of fly ash in the last 30 years that would have otherwise gone into landfills or ponds, and we were the first company in the world reclaiming and recycling coal ash from ponds for concrete. SEFA has a strong heritage of unsurpassed service to its customers in an environmentally sensitive and sustainable manner.


Leadership In Fly Ash Beneficiation

For four decades, The SEFA Group has been adept at stimulating innovation and new service offerings that can further contribute to customers’ success and environmental stewardship. Innovation begins with being a problem solver. Through SEFA’s determination, STAR® (Staged Turbulent Air Reactor) Technology was developed to provide the Company’s ready-mixed concrete customers an uninterrupted supply of recycled fly ash by utilizing and eliminating ash currently stored in impoundments. It is currently the only technology in the world transforming ash previously stored in ponds into a consistent, high-quality product for concrete.

The heartbeat of SEFA is innovation, and the Company will continue to develop technologies, engineer processes, and invest in equipment that make a positive environmental difference for the future.