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Resonant Shock Compaction, LLC (RSCL) has developed, patented and licensed its technology, Resonant Shock Compaction (RSC), to compact coal ash, soil, mining waste,  concrete and other granular materials into strong and durable blocks.

Coal ash can be compacted into ton-sized blocks or panels to construct building walls, earth retaining walls or artificial ocean reefs. Typically these blocks contain 50% to 80% ash with only 5% cement or lime binders, and they are as strong and durable as concrete blocks. Block performance testing has been performed by certified testing laboratories in accordance with ASTM and other approved standards.

Alternatively RSC compacted coal ash blocks may be crushed and screened to manufacture lightweight and normal weight aggregate. Similarly, waste fines from rock quarry aggregate crushing and concrete recycling may be used to manufacture aggregate. All fines generated in this RSC aggregate production can be recycled into the next run.

RSC is a vigorous vibratory-compaction process. Granular materials and binders are placed in a mold then vibratory shock compacted for 2 to 5 seconds. Compacted blocks are ejected from the mold and transferred to storage. Typical granular materials tested include coal ash, waste rock quarry material, mineral mine tailings, crushed (recycled) concrete and soil. Uniquely, the RSC coal ash blocks contain about 50% to 90% ash and only about 5% cement or lime binder, however, the blocks are about as strong and durable as concrete.

The process can also be used to compact and stabilize contaminated soil  to achieve safe storage, transportation and disposal. Typically cement or lime binders are used, but phosphates, clays and other binders may be used too. Alternatively, the blocks may be heated to sinter or vitrify them, as an alternative to very expensive  vitrification. This is a robust process that permits compaction of almost any contaminated soil or debris into a strong and durable waste form. The RSC process achieves about 50% volume reduction and can achieve 80% waste loading. U.S. Department of Energy (DOE) has supported this work.

Research, development and demonstration facilities are located at the University of Denver, Environmental Materials Laboratory.

RSC technology has been licensed for use in the United States, Japan and India.