Experimental Research On The Technical Standards Of Asphalt In Hainan Highway

Hainan province is located at the low latitudes in the southern areas of our country,and in which,Hainan Island with coastal area all around,has created the long time high temperature,and rainfall climate characteristics.In this paper,with a comprehensive survey of Hainan province climate and geography data being made,our current index system of asphalt technology and the asphalt PG grade system of the United States Superpave asphalt technology specification were used as the road asphalt quality controlling standards of Hainan,moreover,based on the current internationally recognized mature PG grading technical standards,standard range suitable for environmental and traffic conditions in Hainan have been trying to put forward from the related indicators of the existing asphalt technology indicator system of our country.Firstly,the Hainan area climate data in recent 10 years was collected.After that,This paper calculated minimum,maximum pavement design temperature of 18 regions of Hainan by using SHRP high-temperature model formula and C-SHRP formula,the minimum pavement design temperature was 6??12.01?,the maximum pavement design temperature was 56.40 ??58.83 ?,that was the asphalt PG graded suitable for 18 regions were two:PG64-10 and PG58-10.Secondly,seven kinds of matrix asphalt and two kinds of SBS modified asphalt which are commonly used im Hainan area were chosen.Detections were given respectively to their penetration,softening point,ductility and viscosity of conventional asphalt performance indicators before and after RTFOT test.In addition,evaluations of their high temperature rutting resistance and medium temperature fatigue resistance performance were given through the dynamic shear rheological tests.Finally,ten kinds of new matrix asphalt were obtained by doing short-term aging test of 30 minutes,60 minutes,85 minutes,170 minutes and 255 minutes to South Korea SK70#asphalt and Esso 70#asphalt.six kinds of 'new modified asphalt 'were obtained by doing RTFOT test of 85 minutes,170 minutes and 255 minutes to two kinds of SBS modified asphalt.Then 16 kinds of new asphalt label were determined according to asphalt index system in our country,meanwhile,the PG grades of the asphalt were also determined.Meanwhile,according to the grey correlation method,the evaluation of correlation between commonly used index of asphalt in our country and high temperature rutting resistance factor and medium temperature fatigue resistance were given,the evaluation of correlation of high temperature rutting resistance factor is higher than the evaluation of correlation of medium temperature fatigue resistance.Based on high and medium temperature indicators fitting curve,and combined with the situation of actual high and medium temperature in Hainan area,the index ranges of matrix asphalt and.modified asphalt suitable for Hainan area were obtained in this paper,which is included A?B?C,three grades.