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Therm-Ex Grout
Product #20775
Therm-Ex Grout is an engineered system for use as back fill material in earth-coupled heat pump systems. Its elevated thermal conductivity and low permeability allow for excellent heat exchange while protecting groundwater supplies.
Therm-Ex Grout should be pumped using a positive displacement pump capable of generating pressures in excess of 300 psi. Developed using high swelling Wyoming Bentonite, this new generation of grouting material offers efficient installation of closed-loop geothermal heat pump systems.
Specifications
Thermal Conductivity | .93 Btu/hr-ft-OF | 1.05 Btu/hr-ft-OF | 1.13 Btu/hr-ft-OF | 1.2 Btu/hr-ft-OF |
Permeability | <2 x 10-8 | 6 x 10-8 | 6 x 10-8; | 6 x 10-8 |
Solids Content | 64% | 67% | 69% | 71% |
Slurry Weight | 13.6 lb/gal | 14.4 lb/gal | 15.1 lb/gal | 15.2 lb/gal |
Slurry Volume/Batch | 29 gals | 36 gals | 41 gals | 41.5 gals |
Approximate Volumes for Grout | |||
Drilled Hole Diameter | Loop Inside Diameter | Anlr. Volume (ft³/ft) | Anlr. Volume (gal/ft) |
4 | 3/4" | 0.08 | 0.57 |
4.5 | 1" | 0.09 | 0.70 |
5 | 1" | 0.12 | 0.89 |
5.5 | 1" | 0.15 | 1.10 |
6 | 1" | 0.18 | 1.33 |
5 | 1-1/4" | 0.11 | 0.84 |
5.5 | 1-1/4" | 0.14 | 1.05 |
6 | 1-1/4" | 0.17 | 1.29 |
Mixing & Handling
The combination of fresh water, Therm-Ex Grout and silica sand constitute the system for back filling geothermal loops. Use locally available dry silica sand. For best results, use sand ranging in size from 30 mesh to 70 mesh (AFS GFN particle size classification 38 to 50).
Mix as follows:
.93 Btu/hr-ft-OF | 1.05 Btu/hr-ft-OF | 1.13 Btu/hr-ft-OF | 1.2 Btu/hr-ft-OF | |
Water | 17 gal | 20 gal | 21 gal | 22 gal |
Therm-Ex Grout | 1-50lb bag | 1-50lb bag | 1-50lb bag | 1-50lb bag |
Silica Sand | 200lb | 300lb | 350lb | 400lb |
Add the Therm-Ex Grout to the water while agitating. Mix for approximately one minute, then add the sand. Agitate until the sand is uniformly dispersed and pump into place using a tremie line.
For best results, place the tremie line near the bottom of the loop and pump into place. Providing local regulations allow, slowly extracting the tremie line as you come up the hole reduces pump pressure, aids the grout in setting quicker, and reduces the opportunity for formation
damage.