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Promat Tunnel
Bormstraat 24 - 2830 Tisselt
Tel. : +32 (0)15 71 81 00
Fax : +32 (0)15 71 81 09 |
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Tunnel Fire Protection > Expert articles
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Runehamar Tunnel Fire Tests - Uptun: Fire Protection
By Octavian Anton , Xiao Wu, Promat International NV , Belgium
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 Runehamar tunnel fire tests (Norway)
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Some boards were collected (Fig.8 shows the locations) for detailed investigations on the matrix behaviour after exposure to most intensive fire or to successive fires (total of 4) . Samples A and B are from overlapped 15mm boards situated at the vertical of the fire , 10m downstream , place where the temperature has reached 1365°C . Sample A was on fire side , sample B backside. A sample C came from a 25mm board situated at the vertical of the source of fire but facing somewhat lower temperature due to the horizontal ventilation . Samples A and B were exposed only to the fire test # 1 , sample C was exposed to all four fire tests . |
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Fig.8 – sampling locations.
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Scanning Electron Microscopy (SEM/EDX) and X-ray diffraction (XRD) were used to investigate on matrix details to establish the profile of temperature evolution inside the product during the fire tests ; the matrix integrity was examined by SEM on polished sections , back-scattered conditions . Thanks to mineral engineering technology , PROMATECT -T has “mineral tracers” , a kind of on site thermometers that can inform about the evolution of the temperature at any place on the board . Figure 9 illustrates the evolution of temperature from the hot to the cold side through the thickness based on mineral phases transformations and engineered crystal morphologies modifications . Some details are shown in figures 10 , 11 and 12 . A temperature profile can be established with maximum 1150°C at 3mm deepness from the exposed surface , maximum 900°C at 7mm , maximum 200°C at 20mm from the exposed surface inside the boards ; the board was exposed up to 1365°C in this test . |
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X-ray diffraction analysis from hot to cold side of the boards demonstrates that on exposed face, on a thickness of 3 – 4mm , a layer of a ceramic insulator was formed at temperatures between 1150° and 1350°C . No defects are created into the matrix during this process (see fig. 10 , left upper side) . |
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The same investigation applied to the sample C revealed that the maximum temperature the exposed face of the board has received was below 1000°C . The temperature was not high enough , and not necessary , to develop the thermal insulator layer . |
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As for the other samples , the SEM/EDX and XRD analysis demonstrate the perfect stability of the matrix of the boards that preserves intact the necessary functions for fire protection . |
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