Analys av brandskyddat trä i konkalorimeter: Om brandskyddsmedels beständighet efter tio års åldring
Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
For buildings which requires higher fire resistance the wood panels can be treated to reduce the risks in the event of a fire. Constructions which are used in damp and outdoor environments are being exposed of great strains which affects the efficiency of the fire retardant. These additives usually consist of inorganic salts with water soluble and hygroscopic abilities that makes the fire retardants to leach and migrate out from the wood. To avoid this the wood can be treated with a protective layer of paint, past studies have shown that alkyd based and linseed-oil based paints are the most efficient for this kind of purpose. The aim with this study is to evaluate the durability of fire retardants for wood panels which has been naturally aged for ten years.To test a product’s fire characteristics and classify it according to European standards the medium-scale method Single Burning Item – En 13823 is being used. In some cases the large-scale method Room Corner Test – ISO 9705 is used. These test methods are however demanding in regards to their cost and time consumption why prediction models have been proposed to anticipate the test results by using results from small-scale tests in a cone calorimeter according to ISO 5660.In this study 25 panels, which were treated with six different kind of fire retardants, were used. The variation between the panels contains also of protective paint layers and the amount of fire retardants. Since the end of the ageing period the panels have been stored in a conditioning room to acuire the right temperature and moisture. Every panel were tested by testing two samples according to ISO 5660 and the results were analysed according to the prediction models Rule of Thumb, The Trätek-model as well as two programs in Cone Tools.The prediction models clearly shows that the fire retardants’ sustainability does not extend over ten years. Some of the panels were classified as best as class D which corresponds to an untreated wood panel. The effect of a protective paint layer was not enough but the alkyd based paint gave the best results. The predictive class for each panel varied between the different models. To sum up only 11 of the 25 panels were predicted to the same class for all four models. The fire retardants have after ten years of ageing no more affect on time to ignition or on the heat release that emits during the initial fire development. That’s why all the products were classified to the same euroclass as for untreated wood or lower.
Place, publisher, year, edition, pages
2016. , 72 p.
Teknik, Brandskyddsmedel, träpanel, utomhusbruk, prediktering, ytskiktsklass
IdentifiersURN: urn:nbn:se:ltu:diva-47366Local ID: 4ecea643-28b1-4d46-9d5d-bb3043010358OAI: oai:DiVA.org:ltu-47366DiVA: diva2:1020687
Subject / course
Student thesis, at least 15 credits
Fire Protection Engineer, bachelor's level
Validerat; 20160126 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved