Viscosity and salinity effect on thermal performance of bentonite-based grouts for ground heat exchanger

Chulho Lee; Sangwoo Park; Dongseop Lee; In Mo Lee; Hangseok Choi

doi:10.1016/j.clay.2014.09.008

Viscosity and salinity effect on thermal performance of bentonite-based grouts for ground heat exchanger

Chulho Lee, Sangwoo Park, Dongseop Lee, In Mo Lee, Hangseok Choi

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Due to its high swelling potential and low hydraulic conductivity, the bentonite-based grout has been popularly used to backfill a borehole constructed for a closed-loop vertical ground heat exchanger in a geothermal heat pump system. In this study, three types of bentonites were compared in terms of viscosity and thermal conductivity. With the consideration of the groundwater inflow, the viscosity and thermal conductivity of the bentonite grouts having bentonite contents of 5%, 10%, 15%, 20% and 25% by weight were also examined. To evaluate the effect of salinity in the coastal area on the swelling potential of the bentonite, volume reduction tests were performed. And in order to reproduce the particle segregation of bentonite-sand mixture when the bentonite-based grout has relatively low viscosity, the segregation was observed using a ring-type separable test apparatus.

Original language	English
Pages (from-to)	455-460
Number of pages	6
Journal	Applied Clay Science
Volume	101
DOIs	https://doi.org/10.1016/j.clay.2014.09.008
Publication status	Published - 2014 Nov 1

Bibliographical note

Funding Information:
This research was supported by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport of the Korean government (No. 13 Construction Research T01) and by a grant from the Strategic Research Project (Development of Key Excavation Solutions for Expandable Urban Underground Space) funded by Korea Institute of Civil Engineering and Building Technology .

Publisher Copyright:
© 2014 Elsevier B.V.

Keywords

Bentonite
Ground heat exchanger
Salinity
Segregation
Thermal conductivity

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1016/j.clay.2014.09.008

Cite this

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title = "Viscosity and salinity effect on thermal performance of bentonite-based grouts for ground heat exchanger",

abstract = "Due to its high swelling potential and low hydraulic conductivity, the bentonite-based grout has been popularly used to backfill a borehole constructed for a closed-loop vertical ground heat exchanger in a geothermal heat pump system. In this study, three types of bentonites were compared in terms of viscosity and thermal conductivity. With the consideration of the groundwater inflow, the viscosity and thermal conductivity of the bentonite grouts having bentonite contents of 5%, 10%, 15%, 20% and 25% by weight were also examined. To evaluate the effect of salinity in the coastal area on the swelling potential of the bentonite, volume reduction tests were performed. And in order to reproduce the particle segregation of bentonite-sand mixture when the bentonite-based grout has relatively low viscosity, the segregation was observed using a ring-type separable test apparatus.",

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author = "Chulho Lee and Sangwoo Park and Dongseop Lee and Lee, {In Mo} and Hangseok Choi",

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AU - Park, Sangwoo

AU - Lee, Dongseop

AU - Lee, In Mo

AU - Choi, Hangseok

N1 - Funding Information: This research was supported by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport of the Korean government (No. 13 Construction Research T01) and by a grant from the Strategic Research Project (Development of Key Excavation Solutions for Expandable Urban Underground Space) funded by Korea Institute of Civil Engineering and Building Technology . Publisher Copyright: © 2014 Elsevier B.V.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Due to its high swelling potential and low hydraulic conductivity, the bentonite-based grout has been popularly used to backfill a borehole constructed for a closed-loop vertical ground heat exchanger in a geothermal heat pump system. In this study, three types of bentonites were compared in terms of viscosity and thermal conductivity. With the consideration of the groundwater inflow, the viscosity and thermal conductivity of the bentonite grouts having bentonite contents of 5%, 10%, 15%, 20% and 25% by weight were also examined. To evaluate the effect of salinity in the coastal area on the swelling potential of the bentonite, volume reduction tests were performed. And in order to reproduce the particle segregation of bentonite-sand mixture when the bentonite-based grout has relatively low viscosity, the segregation was observed using a ring-type separable test apparatus.

AB - Due to its high swelling potential and low hydraulic conductivity, the bentonite-based grout has been popularly used to backfill a borehole constructed for a closed-loop vertical ground heat exchanger in a geothermal heat pump system. In this study, three types of bentonites were compared in terms of viscosity and thermal conductivity. With the consideration of the groundwater inflow, the viscosity and thermal conductivity of the bentonite grouts having bentonite contents of 5%, 10%, 15%, 20% and 25% by weight were also examined. To evaluate the effect of salinity in the coastal area on the swelling potential of the bentonite, volume reduction tests were performed. And in order to reproduce the particle segregation of bentonite-sand mixture when the bentonite-based grout has relatively low viscosity, the segregation was observed using a ring-type separable test apparatus.

KW - Bentonite

KW - Ground heat exchanger

KW - Salinity

KW - Segregation

KW - Thermal conductivity

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M3 - Article

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SN - 0169-1317

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JO - Applied Clay Science

JF - Applied Clay Science

ER -

Viscosity and salinity effect on thermal performance of bentonite-based grouts for ground heat exchanger

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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