Svällande brandstopp i fasadsystem - En experimentell studie

Detta är en Master-uppsats från Lunds universitet/Avdelningen för Brandteknik

Sammanfattning: Since many new techniques and new materials have been introduced in the construction of facades there is a need to better understand the behavior when exposed to a fire. Recent facade fires involving rainshield claddings have displayed major consequences regarding the personal safety of the occupants and towards an economic loss. More understanding is therefore needed to better prevent fires such as the Grenfell Tower 2017 from ever happening again with such destructive force. Especially there is a lacking knowledge about how an intumescent fire seal behaves when exposed to reality-based conditions such as humidity levels and fire exposures. The test setup used consisted of a newly developed intermediate scale setup of a rainshield facade and cone calorimeter tests according to ISO 5660. The intermediate scale test was developed in three phases. The first phase aimed to analyze the fire characteristics of test setup. The second phase analyzed how a graphite-based fire seal behaved in a facade system surrounded by non-combustible materials. The third phase analyzed how a graphite-based fire seal behaved in a façade system surrounded by combustible materials. The test included both dry and moisture saturated linear fire seals. This thesis found that when a fire seal of the type graphite-based was exposed in the test rigg with a fire of 25 kW when moisture saturated compared to a dry fire seal the delay of response could be up to 15 minutes. When a combustible material was places above the fire stop it ignited before the fire stop was activated in both the experiments done with that setup. This could be shown by the recorded temperature above a dry fire seal during phase 3. The temperatures reached up to 1282 °C and sustained temperatures over 400 °C for 280 seconds. The expansion of the fire seal was found to be controlled by the different layers within the fire seal and how they interact with each other at moisture saturation or dry conditions.

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