Effectiveness of rigid insulation for thermal protection of buried water pipes in rock trenches

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Conference27th Annual CSCE Conference, Cold Regions Engineering Specialty Conference: 03 June 1999, Regina, SK., Canada
Pages389398; # of pages: 10
Subjectlatent heat, frost penetration, insulation, buried pipes, rock trenches; Water mains
AbstractLaboratory tests were conducted to investigate the effect of latent heat on frost penetration in backfill specimens. Each specimen was prepared and placed in PVC moulds, which represent a rock trench. Rigid polystyrene insulation boards and expanded polystyrene beads were used in some specimens. The specimens were then subjected to a sudden temperature drop from 22oC to -15oC. The preliminary study showed that high moisture content backfill materials had a lower cooling rate and a longer time plateau around the freezing point than low moisture content ones because of the low thermal diffusivity and the release of latent heat. The use of polystyrene insulation actually promoted a faster frost penetration than without the insulation. The study shows that the rigid insulation was not effective in delaying frost advance to the centre of the specimens.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number43093
NPARC number20331212
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Record identifier3b151201-8483-4ad1-9ba9-7fc9ef24c7e9
Record created2012-07-18
Record modified2016-05-09
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