| The improvement of recycling technology of reclaimed asphalt pavement (RAP) has been contributing high recycling rate in Japan, almost 98% of the construction waste is recycled in 2008. The acceptability of using RAP into recycled asphalt mix has been evaluated by penetration grade of aged asphalt. However, this method is insufficient for evaluating RAP which contains polymer modified asphalt (PMA), due to low penetration grade of the old PMA. Thus, it would be desirable to establish new evaluation method for recycling PMA inRAP. Based on cooperative research between Public Works Research Institute (PWRI) and Japan Asphalt Mixture Association (JMAA), “bituminous tenacity index” is suggested as a new evaluation index of recycled aggregate. Bituminous tenacity index is obtained bysplitting test and it is clarified that there is a high correlation with aging level of the aged asphalt and/or fatigue failure resistance. The use of bituminous tenacity index enables determining the acceptability of using RAP which contains PMA. |
