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Improvement of earthing systems with backfill materials

Long term performance of several backfill materials, which are freely available as industrial wastes or at a low cost in Sri Lanka, have been investigated by taking the earth resistance of deep driven Galvanized Iron (GI) electrodes over a period of 2-3 years. The best performing material, metal oxi...

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Main Authors: Gomes, Chandima, Lalitha, Chamath, Priyadarshanee, Chamalee
Format: Conference or Workshop Item
Language:English
Published: IEEE 2010
Online Access:http://psasir.upm.edu.my/id/eprint/45141/1/Improvement%20of%20earthing%20systems%20with%20backfill%20materials.pdf
http://psasir.upm.edu.my/id/eprint/45141/
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spelling my.upm.eprints.451412020-08-07T02:25:59Z http://psasir.upm.edu.my/id/eprint/45141/ Improvement of earthing systems with backfill materials Gomes, Chandima Lalitha, Chamath Priyadarshanee, Chamalee Long term performance of several backfill materials, which are freely available as industrial wastes or at a low cost in Sri Lanka, have been investigated by taking the earth resistance of deep driven Galvanized Iron (GI) electrodes over a period of 2-3 years. The best performing material, metal oxide powder (a waste product of steel industry), was tested against several commercially available and traditionally used backfill materials. It was found that these industrial wastes reach the level of performance of commercially available backfill materials after several months. It was also found that the percentage of material erosion of GI due to corrosion in the presence of metal oxide powder is less than 1 % after more than two years in contact. Lime and coke breeze also show good performance with respect to corrosion while commercially available natural Bentonite performs the best. Sodium Chloride, a backfill material that is widely used in South Asia, gave highly undesirable outcome; the earth resistance of the relevant electrode fluctuates in a wide range of values and the corrosive effects are unacceptably high. The resistivity and the change of resistivity of each material under dry and wet conditions were measured to find a relation between the earth resistance and the observed parameters. Under dry conditions the resistivity of most of the well performed backfill materials has somewhat higher values, however under wet conditions the resistivity markedly reduces to a low value. This change of resistivity appears to be a characteristic of a good backfill material. However, Sodium Chloride, which possesses such characteristic, should not be used as a backfill material due to a number of drawbacks. IEEE 2010 Conference or Workshop Item PeerReviewed text en http://psasir.upm.edu.my/id/eprint/45141/1/Improvement%20of%20earthing%20systems%20with%20backfill%20materials.pdf Gomes, Chandima and Lalitha, Chamath and Priyadarshanee, Chamalee (2010) Improvement of earthing systems with backfill materials. In: 30th International Conference on Lightning Protection (ICLP 2010), 13-17 Sept. 2010, Cagliari, Italy. (pp. 1-9). 10.1109/ICLP.2010.7845822
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Long term performance of several backfill materials, which are freely available as industrial wastes or at a low cost in Sri Lanka, have been investigated by taking the earth resistance of deep driven Galvanized Iron (GI) electrodes over a period of 2-3 years. The best performing material, metal oxide powder (a waste product of steel industry), was tested against several commercially available and traditionally used backfill materials. It was found that these industrial wastes reach the level of performance of commercially available backfill materials after several months. It was also found that the percentage of material erosion of GI due to corrosion in the presence of metal oxide powder is less than 1 % after more than two years in contact. Lime and coke breeze also show good performance with respect to corrosion while commercially available natural Bentonite performs the best. Sodium Chloride, a backfill material that is widely used in South Asia, gave highly undesirable outcome; the earth resistance of the relevant electrode fluctuates in a wide range of values and the corrosive effects are unacceptably high. The resistivity and the change of resistivity of each material under dry and wet conditions were measured to find a relation between the earth resistance and the observed parameters. Under dry conditions the resistivity of most of the well performed backfill materials has somewhat higher values, however under wet conditions the resistivity markedly reduces to a low value. This change of resistivity appears to be a characteristic of a good backfill material. However, Sodium Chloride, which possesses such characteristic, should not be used as a backfill material due to a number of drawbacks.
format Conference or Workshop Item
author Gomes, Chandima
Lalitha, Chamath
Priyadarshanee, Chamalee
spellingShingle Gomes, Chandima
Lalitha, Chamath
Priyadarshanee, Chamalee
Improvement of earthing systems with backfill materials
author_facet Gomes, Chandima
Lalitha, Chamath
Priyadarshanee, Chamalee
author_sort Gomes, Chandima
title Improvement of earthing systems with backfill materials
title_short Improvement of earthing systems with backfill materials
title_full Improvement of earthing systems with backfill materials
title_fullStr Improvement of earthing systems with backfill materials
title_full_unstemmed Improvement of earthing systems with backfill materials
title_sort improvement of earthing systems with backfill materials
publisher IEEE
publishDate 2010
url http://psasir.upm.edu.my/id/eprint/45141/1/Improvement%20of%20earthing%20systems%20with%20backfill%20materials.pdf
http://psasir.upm.edu.my/id/eprint/45141/
_version_ 1675328726905126912
score 13.211869

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