Thermally conductive cementitious grout for geothermal heat pump systems
Abstract
A thermally conductive cement-sand grout for use with a geothermal heat pump system. The cement sand grout contains cement, silica sand, a superplasticizer, water and optionally bentonite. The present invention also includes a method of filling boreholes used for geothermal heat pump systems with the thermally conductive cement-sand grout. The cement-sand grout has improved thermal conductivity over neat cement and bentonite grouts, which allows shallower bore holes to be used to provide an equivalent heat transfer capacity. In addition, the cement-sand grouts of the present invention also provide improved bond strengths and decreased permeabilities. The cement-sand grouts can also contain blast furnace slag, fly ash, a thermoplastic air entraining agent, latex, a shrinkage reducing admixture, calcium oxide and combinations thereof.
- Inventors:
-
- Old Field, NY
- Issue Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- OSTI Identifier:
- 873806
- Patent Number(s):
- 6251179
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C - CHEMISTRY C09 - DYES C09K - MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- DOE Contract Number:
- AC02-98C1110886
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- thermally; conductive; cementitious; grout; geothermal; heat; pump; systems; cement-sand; cement; sand; contains; silica; superplasticizer; water; optionally; bentonite; method; filling; boreholes; improved; thermal; conductivity; neat; grouts; allows; shallower; bore; holes; provide; equivalent; transfer; capacity; addition; bond; strengths; decreased; permeabilities; contain; blast; furnace; slag; fly; ash; thermoplastic; air; entraining; agent; latex; shrinkage; reducing; admixture; calcium; oxide; combinations; pump systems; bore holes; cementitious grout; provide improved; improved thermal; calcium oxide; thermal conductivity; fly ash; heat pump; heat transfer; thermally conductive; silica sand; geothermal heat; thermal heat; sand grout; provide improve; blast furnace; bond strength; /106/166/507/
Citation Formats
Allan, Marita. Thermally conductive cementitious grout for geothermal heat pump systems. United States: N. p., 2001.
Web.
Allan, Marita. Thermally conductive cementitious grout for geothermal heat pump systems. United States.
Allan, Marita. Mon .
"Thermally conductive cementitious grout for geothermal heat pump systems". United States. https://www.osti.gov/servlets/purl/873806.
@article{osti_873806,
title = {Thermally conductive cementitious grout for geothermal heat pump systems},
author = {Allan, Marita},
abstractNote = {A thermally conductive cement-sand grout for use with a geothermal heat pump system. The cement sand grout contains cement, silica sand, a superplasticizer, water and optionally bentonite. The present invention also includes a method of filling boreholes used for geothermal heat pump systems with the thermally conductive cement-sand grout. The cement-sand grout has improved thermal conductivity over neat cement and bentonite grouts, which allows shallower bore holes to be used to provide an equivalent heat transfer capacity. In addition, the cement-sand grouts of the present invention also provide improved bond strengths and decreased permeabilities. The cement-sand grouts can also contain blast furnace slag, fly ash, a thermoplastic air entraining agent, latex, a shrinkage reducing admixture, calcium oxide and combinations thereof.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}
Works referenced in this record:
Thermally conductive cementitious grouts for geothermal heat pumps. Progress report FY 1998
report, November 1998
- Allan, M. L.; Philippacopoulos, A. J.