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

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Description

Research commenced in FY 97 to determine the suitability of superplasticized cement-sand grouts for backfilling vertical boreholes used with geothermal heat pump (GHP) systems. The overall objectives were to develop, evaluate and demonstrate cementitious grouts that could reduce the required bore length and improve the performance of GHPs. This report summarizes the accomplishments in FY 98. The developed thermally conductive grout consists of cement, water, a particular grade of silica sand, superplasticizer and a small amount of bentonite. While the primary function of the grout is to facilitate heat transfer between the U-loop and surrounding formation, it is also essential ... continued below

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84 p.

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Allan, M.L. & Philippacopoulos, A.J. November 1, 1998.

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Description

Research commenced in FY 97 to determine the suitability of superplasticized cement-sand grouts for backfilling vertical boreholes used with geothermal heat pump (GHP) systems. The overall objectives were to develop, evaluate and demonstrate cementitious grouts that could reduce the required bore length and improve the performance of GHPs. This report summarizes the accomplishments in FY 98. The developed thermally conductive grout consists of cement, water, a particular grade of silica sand, superplasticizer and a small amount of bentonite. While the primary function of the grout is to facilitate heat transfer between the U-loop and surrounding formation, it is also essential that the grout act as an effective borehole sealant. Two types of permeability (hydraulic conductivity) tests was conducted to evaluate the sealing performance of the cement-sand grout. Additional properties of the proposed grout that were investigated include bleeding, shrinkage, bond strength, freeze-thaw durability, compressive, flexural and tensile strengths, elastic modulus, Poisson`s ratio and ultrasonic pulse velocity.

Physical Description

84 p.

Notes

OSTI as DE99001528

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  • Other Information: PBD: Nov 1998

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  • Other: DE99001528
  • Report No.: BNL--66103
  • Grant Number: AC02-98CH10886
  • DOI: 10.2172/307835 | External Link
  • Office of Scientific & Technical Information Report Number: 307835
  • Archival Resource Key: ark:/67531/metadc684830

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  • November 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 13, 2015, 11:25 p.m.

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Allan, M.L. & Philippacopoulos, A.J. Thermally conductive cementitious grouts for geothermal heat pumps. Progress report FY 1998, report, November 1, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc684830/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.