Study On The Performance Of Repeatedly Recycled SBS Modified Asphalt

SBS modified asphalt is a kind of mixture made through adding SBS high-molecular polymer to base asphalt. On account of the fine performance of SBS modified asphalt both in high and low temperature, SBS modified asphalt has been used in great quantities in the construction of high grade pavement in our country.However, the first batch of SBS modified bituminous pavement in our country have been used 20 years since the 1990 s.Even the pavement built since 21 st century has also been used more than 10 years.These roads need to be overhauled or have been overhauled several times.The overhauling will produce a mass of abandoned SBS modified asphalt pavement materials. Therefore, to recycle these old pavement material, the study on the recycling and repeated recycling of SBS modified asphalt has important significance.This dissertation is based on a plan subject supported by National Science and Technology—The Application and Demonstration Of the Old Asphalt Pavement Recycling Technology. To study the issue of whether the SBS modified asphalt can be recycled and even recycled repeatedly or not, This paper analysed the characteristic indicators and viscous-elastic behaviour of the SBS modified asphalt and the rheological properties of the recycled granular asphalt concrete through the indoor aging and recycling test of SBS modified asphalt.This study found that: both the results of asphalt test and recycled granular asphalt concrete test show that the recycling agent can’t completely restore the performance of SBS modified asphalt to the original level, but can improve the performance of aging asphalt in certain degree.In general, once recycling has the best effect on restoring the characteristics of aged SBS modified asphalt and the recycled modified asphalt retained more characteristics of SBS modification;Though the characteristic indicators of the Repeated recycling SBS modified asphalt has attenuated a lot, but the Repeated recycling SBS modified asphalt still retained a part of modified properties which the base asphalt does not have.