FOCUS
Fire service measures Bay
Material Bay 1 RDF piled
Duration of test
50 hours
Maximum temperature recorded
400-500°C
Comments
Slight heating through the block, but still able to hold a bare hand on the outside edge of the blocks. Flame penetration through gaps in the blocks downwind of the fire.
Bay 2 RDF piled 50 hours 400-500°C
Slight heating through the block, but still able to hold a bare hand on the outside edge of the blocks. Flame penetration through gaps in the blocks downwind of the fire.
Bay 3 Plastic semi piled
Bay 4 Pre crushed wood piled
2 hours 20 hours 1,100°C 950°C
Wetting agent A water and wetting agent solution was applied, and it was noted that the wetting agent did knock the fire down quickly, resulting in a reduced temperature 2m below the surface of the pile. But it was also noted that, in common with the other agents, the application of copious quantities did not improve its efficiency, but just added to the water runoff.
Re ignition of piled waste Through the holes used to pilot the ignition, a jet of wetting agent mixture was applied to the piles, and allowed to run until water agent mixture was running freely through the joints in the Legioblock walls. The thermocouple readings were observed
to have dropped to ambient temperature, and therefore it was assumed that the fires had been extinguished, and the site was left overnight for approximately 12 hours.
Slight heating through the block, but still able to hold a bare hand on the outside edge of the blocks.
Post fire spalling of the inner face of the block, but remained stable.
However, the next morning it became
apparent that the cores of both fires had returned to their original fire conditions and had reached the pre extinguished temperature. This behaviour was also observed at the earlier test at Barling in Essex, which leads the author to believe that the core residue has become chemically predisposed to re ignition. This is not understood at present and
it will require further research to establish the cause of such repeated re ignitions. Firefighting crews should be cautious and isolate burnt material for a number of days in order to establish that the material will not re ignite.
Fire resisting block work
The fire resisting block work was formed using blocks provided by Legioblock, although, walls formed of concrete blocks supplied through
Figures 10, 11 and 12 (left, above and right)
28 NOVEMBER 2018
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