This report summarizes the findings of research directed at identifying maintenance solutions for bleeding and flushed pavements surfaced with a chip seal. Factors that contribute to bleeding and flushed chip seals include aggregate issues, binder issues, traffic issues, environmental issues, and construction issues. There is no better advice for dealing with bleeding and flushed chip seals than to avoid the problem from the outset by employing a preventive maintenance perspective. Bleeding is an immediate maintenance problem that must be addressed using corrective or in some cases,emergency, maintenance. The basic approaches used to treat bleeding include bridging over the liquid asphalt by applying aggregate of various types and gradations, cooling off the pavement surface by applying water with or without additives, or removing the bleeding asphalt and rebuilding the pavement seal. Flushing, in contrast to bleeding, is typically not a maintenance problem that must be addressed immediately. The basic approaches to treat flushed chip seals are to retexture the existing surface or to adda new textured surface over the flushed pavement. Three promising areas for further research and implementation relative to bleeding/flushing solutions include the use of lime water, the use of ultra high pressure water cutting, and the use of the racked-in seal at intersections.
Abstract