Study On Smokesuppresion Ogfc Technique Of Tunnel Pavement Maintenance

Along with the continuous expansion of our traffic construction and the implementation of develop-the-west strategy, a lot of freeways have been built in the west highland。In order to lower longitudinal slop,improve tracks and speed, the number of tunnels increases gradually, also the tunnel mileages accounts for many of the whole freeway mileages. The freeway tunnel is a kind of relatively closed and narrow tubular environment, in which the air flows slowly. Ordinary HMA will contaminate the air badly while constructed in the tunnel and cause the machine breakdown, even jeopardize the health of workers.The text studys the generating mechanism of pitch fume and its major influence factor, then puts forward some feasible methods of cutting pitch fume and improving construction environment. The study adopts simplified ultraviolet spectrophotometry to measure the pitch fume and two methods to cut it. One is viscosity breaker technique, the pitch fume is cut by lowering the application temperature with viscosity breaker ROADBIT-BPL and Sasobit; the other is addition of smoke suppressant Al(OH)3 and Mg(OH)2. The study finds that lowering the application temperature by viscosity breaker technique can cut the pitch fume observably; the addition of smoke suppressant has certain effect, but not markedly, and has certain adverse effect to the property of asphalt. The pavement performance of OGFC-13 with smokesuppressant asphalt can meet the technical requirements of specification.