Three Tests of Firehosing Technique and Equipment for the Removal of Fallout from Asphalt Streets and Roofing Materials

摘要

The report describes three separate firehosing experiments. Each employed radio-traced simulant in order to measure removal effectiveness. It was concluded that: (1) Effectiveness of reclamation by firehosing improves as surface roughness decreases and particle size increases. (2) Removal effectiveness improves with effort, but the residual mass is not significantly reduced after the second pass. (3) The flare nozzle is consistently more effective than the fire nozzle in cleaning roof surfaces. This is not the case for paved surfaces. (4) Results from full scale tests show that the removal effectiveness can never equal that achieved under the less realistic operating conditions represented by smaller engineering-scale tests. (5) RN2 exposure reduction factors are not significantly affected by surface roughness, particle size or mass loading. (Author)