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Gjutning av isbanor för biltestning
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
1992 (Swedish)Report (Other academic)
Abstract [en]

The effect of limestone and surfactants on thin superimposed ice layers have been examined. The ice quallity is in high extent dependent on the amount and size of encapsulated air bubbles. In laboratory tests a small amount of an anionic surfactant seemed to reduce the production of gasbubbles during freezing. Reduction of porosity in the ice was also obtained by decreasing the air content in the water but this may be somewhat unpractical. White limestone mixed with water showed two positive effects. The water froze faster and the ice became whiter. The whiter ice surface reflected more solar radiation which helps to protect the ground underneeth from heat. Sudden heating of a thick ice cover caused thermal cracking. Therefore it can be recommended that the ice surface in cold weather is sprayed with a fine moisture before flooding.

Abstract [sv]

Inverkan av kalk och tensider vid gjutning av tunna isskikt har studerats experimentellt. Isens kvalitet beror i hög grad på mängden och storleken av inneslutna luftbubblor. Vid kontrollerad frysning av tensidlösningar tycks produktionen av gasbubblor minska i närvaro av anjoniska tensider. Minskad porositet erhölls också genom att avlufta gjutvattnet men det är svårt att utföra vid praktisk tillämpning. Vit dolomitkalk som slammades upp i gjutvattnet hade två positiva effekter. Vattnet frös snabbare och isen blev vitare. Den vitare isytan reflekterar solstrålning bättre vilket skyddar underlaget mot värme. Hastig uppvärmning av en tjock isyta medför risk för termisk uppsprickning. Därför rekommenderas att isytan sprejas med en tunn vattendimma före vattengjutningen vid kall väderlek.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1992. , p. 13
Series
Coldtech, ISSN 1102-4801 ; 92:4
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-23998Local ID: 944cb110-04a2-11dd-b034-000ea68e967bISBN: 91-971792-3-X (print)OAI: oai:DiVA.org:ltu-23998DiVA, id: diva2:997048
Note
Godkänd; 1992; 20080407 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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https://www.ltu.se/webbarkiv/BIB/coldtech/ct92-4.html

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Fransson, Lennart

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