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Tätskikt och kantlösningar på tvärspända brobaneplattor av trä
RISE - Research Institutes of Sweden. (Byggteknik, Träbyggande och boende)
2016 (Swedish)Report (Other academic)
Abstract [en]

This report has been prepared within the project DuraTB - Durable Timber Bridges. The

goal of the project is to develop sustainable timber bridges by developing guidelines for

moisture design and developing new and improved bridges and bridge details. This report

describes the results from a subproject with the participation of SP Technical Research

Institute of Sweden, Martinsons Byggsystem AB, Moelven Töreboda AB and the

Swedish Transport Administration. Also waterproofing contractors and entrepreneurs

participated in the work. The purpose of the subproject was to investigate primers and

waterproofing and to improve the edge details of Swedish timber bridges with stresslaminated

decks made of spruce. This report contains a summary of follow-up of

blistering on wooden decks, tests of bitumen primers with regard to adhesion and water

resistance and tests of new edge solutions for wooden bridges.

A review of inspection results from more than one hundred inspected Swedish timber

bridges with asphalt pavement on stress-laminated decks showed that about 30 % had

some remarks about the pavement. The most common damages were cracks especially at

deck ends in connection to abutments. Bridges with blisters at the time of inspection were

few. Laboratory tests of adhesion were carried out which showed that the primer can

contribute to the adhesion of the waterproofing bitumen sheet to the wood, although both

tensile and tear tests gave large variations in the results so it is difficult to draw firm

conclusions. The tests showed that both water-based and solvent-based primer can be

used. Timber bridge manufacturers want to use the more environmentally friendly waterbased

primer in the factory and the more weather resistant and quick drying solvent-based

at the building site. The tests showed, however, also some adhesion of waterproofing

sheets to a wood surface without primer, even to a damp or dirty surface. Testing of water

resistance of primer on wood surfaces showed that the primer provides some moisture

protection which is favorable for the wood. The penetration of moisture was less than for

untreated wood, but the primer was not completely waterproof. An untreated moist wood

surface, however, dried out relatively quickly. At the testing of edge details with

installations of edge steel angels on wooden deck specimens, the steel angels showed a

tendency to deform under the effect of heat from welding of the waterproofing bitumen

sheet. To get a robust solution with little deformation also mechanical fixings to the wood

deck was tested and is recommended.

Several parties are involved in the construction process, so there is a need for detailed

descriptions for the work. This subproject has contributed to some new sections in the

Swedish AMA (General material and work descriptions) used by the construction

industry, to improve the information about timber bridges and assist the construction of

durable timber bridges.

 

Place, publisher, year, edition, pages
Borås, 2016. , 74 p.
Series
SP Rapport, ISSN 0284-5172 ; 2016:90
Keyword [en]
timber bridge, stress-laminated decks, moisture content, asphalt surfacing, waterproof bitumen sheet, bituminous primer, deck edge
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-29415OAI: oai:DiVA.org:ri-29415DiVA: diva2:1093971
Projects
DuraTB - Durable Timber Bridges
Funder
VINNOVA
Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2017-05-11Bibliographically approved

Open Access in DiVA

Tätskikt och kantlösningar(22098 kB)29 downloads
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RISE - Research Institutes of Sweden
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CiteExportLink to record
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Citation style
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