The high-strength mix is designed to provide 3000 PSI of compressive strength and RHO design values of 50-65
High-strength LowRHO concrete is used like normal concrete for duct bank encasement. It provides maximum protection against dig-ins and undermining during future excavations. As a rule, high-strength LowRHO is more thermally conductive than low-strength LowRHO, but it is much more difficult to remove in future excavations.
The low-strength mix is designed to provide 100-200 PSI of compressive strength and RHO design values of 70-80
Low-strength LowRHO concrete is used like controlled density fill (CDF) to backfill trenches over the high-strength LowRHO duct banks, and also for encasement where high strength is not desired. It provides superior thermal properties compared with other backfills and is self-compacting, a desirable property in traffic areas.
