| Download | - View author's version: Mitigation of frost heave around manholes: a proven innovation (PDF, 2.6 MiB)
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| Author | Search for: Lowery, M. S.1; Search for: Svec, O. J.1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Research in Construction
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| Format | Text, Article |
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| Conference | INFRA 2001, November 26-28, 2001, Montreal, Quebec, Canada |
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| Subject | Manholes; frost heave; mitigation; manholes; access holes; infiltration pitholes |
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| Abstract | Deformation and cracking of asphalt pavement around sanitary and storm sewers are major and costly problems in northern cities all over the world. The main cause of this pavement deterioration is frost heave, which can lead to a substantial uplift of pavement (5 to 10 cm), as well as to cracking of the asphalt surface around manholes. This paper describes an innovation developed by Otto J. Svec with the trade name GHM-RAD, that prevents freezing temperatures (the 0°C isotherm) from moving below the pavement structure down to the frost-susceptible soil, thereby controlling frost heave around access hole structures.
This new technology is a closed system that modifies the top taper cone section of a manhole by casting slots into its walls. This section is installed surrounded by a donut-shaped bag made of geotextile and containing clean, 51 mrif aggregate. Temperature readings revealed warm sewer air circulated out through the slots and around the "radiator bag". This transferred heat energy kept the ground below the bag from freezing.
With the assistance of the City of Ottawa, two field studies monitored four test sites and two control sites during the winters of 1998-1999 and 2000-2001. Thermocouple readings have provided consistent and conclusive evidence that this innovation prevented freezing temperatures from moving into the frost-susceptible soil during two winters. Also, inflow and infiltration concerns were considered in the second field study and preliminary results indicate additional water inflow through the slots might not be a concern with this innovation. |
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| Publication date | 2001-12-01 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRCC 45190
NRC-IRC-14254 |
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| NPARC number | 20326314 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 8e9bb403-b5e7-4f38-9739-2a6ec0d47bbf |
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| Record created | 2012-07-18 |
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| Record modified | 2024-05-22 |
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