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Thermally conductive cementitious grout for geothermal heat pump systems

Patent ·
OSTI ID:873806
 [1]
  1. Old Field, NY
+ Show Author Affiliations

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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY
Assignee:
United States of America as represented by Department of Energy (Washington, DC)
Patent Number(s):
US 6251179
OSTI ID:
873806
Country of Publication:
United States
Language:
English

References (1)

Thermally conductive cementitious grouts for geothermal heat pumps. Progress report FY 1998 report November 1998

Similar Records

Thermally conductive cementitious grouts for geothermal heat pumps. Progress report FY 1998
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Related Subjects

/106/166/507/
addition
admixture
agent
air
allows
ash
bentonite
blast
blast furnace
bond
bond strength
bore
bore holes
boreholes
calcium
calcium oxide
capacity
cement
cement-sand
cementitious
cementitious grout
combinations
conductive
conductivity
contain
contains
decreased
entraining
equivalent
filling
fly
fly ash
furnace
geothermal
geothermal heat
grout
grouts
heat
heat pump
heat transfer
holes
improved
improved thermal
latex
method
neat
optionally
oxide
permeabilities
provide
provide improve
provide improved
pump
pump systems
reducing
sand
sand grout
shallower
shrinkage
silica
silica sand
slag
strengths
superplasticizer
systems
thermal
thermal conductivity
thermal heat
thermally
thermally conductive
thermoplastic
transfer
water