Iraqi Journal of Chemical and Petroleum Engineering (Dec 2012)
Prediction of The Chemical Composition and Physical properties of Aged Asphalt Cement
Abstract
In the present work a modification was made on three equations to represent the experiment data which results for Iraqi petroleum and natural asphalt. The equations have been developed for estimating the chemical composition and physical properties of asphalt cement at different temperature and aging time. The standard deviations of all equations were calculated. The modified correlation related to the aging time and temperature with penetration index and durability index of aged petroleum and natural asphalts were developed. The first equation represents the relationship between the durability index with aging time and temperature. loge(DI)=a1+0.0123(2loge T-a3(1/30.t2+1/2.t)) The second equation represents the relationship between the penetration index with aging time and temperature. Log(PI)e=b1-0.2013(T-(b3+b4t))2 The third equation represents the relationship between the durability index with penetration index. Logeloge(PI)=a-0.5627loge(DI) The values of penetration index and durability index for all aged samples were compared with predicted values. These correlations give a percent of error in the range of 1.2 to 7.4%.
