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Polering av asfaltbeläggning
Swedish National Road and Transport Research Institute.
Swedish National Road and Transport Research Institute.ORCID iD: 0000-0002-8242-3407
2008 (Swedish)Report (Other academic)Alternative title
Polishing of the coarse aggregate (English)
Abstract [sv]

I många länder där dubbdäck är förbjudna är trafikpoleringen ett stort problem och föreskrifter finns bland annat för stenmaterialets poleringsbenägenhet. I Sverige har dubbdäckstrafiken medfört att stenmaterialet på vintern ruggats upp varför låga friktionstal varit ovanliga på inslitna beläggningar. Val av allt slitstarkare stenmaterial, övergång till skelettasfalt samt skonsammare dubbar har dock markant reducerat dubbslitaget. På senare år har problem med låg våtfriktion konstaterats på slitstarka beläggningar under sommarhalvåret, framför allt i utsatta lägen och under eftersommaren och hösten. Mätningar har visat att friktionen snabbt kan reduceras om beläggningen är poleringsbenägen och halkrelaterade olyckor har rapporterats på polerade beläggningar.

Denna rapport är en kunskapsöversikt om polering, friktion och i viss mån textur och beläggningsslitage från dubbade fordon. Erfarenheter från friktionsmätningar främst i Stockholm och Göteborg har samlats in. En översyn ges över provningsmetoder och de krav som finns. Kompletterande friktionsmätningar har utförts med flera utrustningar (SAAB Friction Tester och BV12) där mäthastighet, tidpunkt på året, vattenmängd, typ av däck och ringtryck varierats. 

Abstract [en]

In many countries, where studded tyres are prohibited, the traffic polishing of the coarse aggregate in the wearing courses is a problem to a rather great extent. In those countries there are often regulations on the aggregate polishing value. In Sweden, where the use of studded tyres is extensive, the micro texture of the aggregate in the surface of the wearing courses increases during the winter season. Therefore, there have been few problems with low wet friction levels in Sweden. However, the increased use of wear resistant aggregates and stone mastic asphalt together with lightweight studs has led to a reduced amount of wear. During later years, a problem with low friction levels has been noticed in wear resistant surface courses during late summer and fall, especially at high trafficked roads with a complicated geometry. Measurements have shown that the friction level can be reduced rather quickly on surfaces with aggregates that are disposed for polishing and low wet friction related accidents have been reported. This report is a knowledge survey covering polishing, friction and to some extent surface texture and wear caused by studded tyres. Experiences from friction measurements mainly in Stockholm and Gothenburg have been compiled in this report. A review of testing methods and existing requirements is also presented in the report. Friction measurements have been carried out with two friction measurement equipments, SAAB Friction Tester and BV12, where the measuring speed, time of the year, the amount of water film thickness, the type of tyre and tyre pressure have been varied.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2008. , p. 39
Series
VTI notat ; 25-2007
Keyword [en]
Polishing, Surface texture, Wearing course, Aggregate, Friction, Measurement, Test method, Flexible pavement, Porphyry, Quartzite
Research subject
30 Road: Highway design, 33 Road: Surfacing
Identifiers
URN: urn:nbn:se:vti:diva-1658OAI: oai:DiVA.org:vti-1658DiVA, id: diva2:670370
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2018-01-22

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Jacobson, TorbjörnHjort, Mattias
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