Publikacje

Abstract:

Multidimensional analysis was carried out to check the impact of bitumen foaming on its properties.Unmodified bitumen 50/70, bitumen 50/70 modified with 2.5% synthetic wax and control bitumen70/100 were used in the experiment. The main research goal was to establish whether it is possible topredict the Ageing Index (IS) using a data set consisting of three main subsets containing i) foamingparameters (ERm, HL), ii) selected rheological properties of bitumen (for example ZSV,d) before and afterfoaming, and (iii) bitumen chemical changes after foaming determined using FTIR spectroscopy. All bitu-men types were foamed at various temperatures (110°C to 180°C), air pressures (100 kPa to 700 kPa)and water contents (1% to 5%). Due to large multicollinearity between input variables, the input dataset was transformed into a new data set that was reduced using Factor Analysis (FA). The use of theFA method together with the data from the FTIR analysis allowed building a highly effective regressionmodel for predicting the Ageing Index. The Ageing Index model had a matching error of 0.1 and the coef-ficient of determination > 95%. Analysis results were validated against the bitumen 70/100 results. Itshould be noted that the input data set presented here can be a good starting point for predicting otherrheological characteristics of foamed bitumen.

POWRÓT

Strona główna > Publikacje

Multi-dimensional analysis of the foaming process impact on 50/70 bitumen ageing