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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
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 to other backfills, and is self-compacting – a very desirable property in traffic areas.
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Wikipedia
Basic information about the Neher McGrath method, Calculations, Complexities, heating and thermal power transfer in larger underground ductbanks. […]
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Neher-McGrath Institute®
Certification of underground installation, designed or peer reviewed by a Registered Professional Engineer (P.E.) who specializes in the Neher-McGrath Calculation. […]
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Expert Witness
Experiencing issues with an underground installation? These Trail Experiences Expert Witness can provide the Expertise you need to solve any Nether McGrath issue. […]