What is Thermal Grouting?

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Thermal grouting can be installed underground or around conduits. Underground electrical transmission and distribution lines dissipate heat generated by electric current into the surrounding ground. This will help improve electrical transmission and increase the life span of the lines.


Thermal grouts are installed around conduits installed in horizontally directionally drilled (HOD) or (HDD) or by other trenchless means casings. Typical mix designs for thermal grout include cement, silica sand, water, and specialty chemical admixtures. Each project uses different grout mixes designed to accomplish the engineering and construction requirements. It is important that a comprehensive quality control program be in place as grout is installed.

There is only one chance to get it right. Grout must be tested prior to going into the bore. Typical on-site checks will include weight (specific gravity); air content; and depending on the mix design, efflux or flow. Unit weight determines that the correct material percentages are maintained.


These grouts should not be confused with fluidized thermal backfills (FTBs}, which are used in open-cut applications. Both classes of materials remove heat from around cables. Thermal grouts should be very flow-able and pump-able- characteristics not typically required of FTBs. As a general rule, FTBs are less expensive than thermal grouts.

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