Oxidation Influence on the Chemical Content and Some Rheologicaly Properties for Natural Asphalt to Abu Aljeer _ Alanbar

Abstract

Heating of natural asphalt at high temperatures for a long time lead to oxidation of the asphalt , which starting on the surface while with continuous mixing and heating leads to oxidation to all the asphalt molecules and the texture of oxidized asphalt becomes a solid , glossy, dark black of color. The rheological properties before and after oxidation were studied , the results showed that increase of oxidation time , Lead to reduce the degree of penetration(increased stiffness) and an increment in the softening degree, also the oxidation processes load to increase in the fractional Asphaltene compared with that of maltene parts, Which have been separated and estimated by using manual column liquid -solid chromatography and extraction in parallel with a solvent and precipitant the Asphaltene index I A and Gastl index I C were also calculated, the spectra of FT-IR , U.Vvisible and HNMR showed a change in the physical properties of oxidated since there was Chemo -Physical relationship between a chemical content and Rheological properties of the oxidized asphalt .

Effect of Natural Bitumen on the Performance of Hot Asphalt Mixture‏

“…In its natural state, NA is not suitable for pavement applications. To address this, heat treatments over varying intervals (5,10,15,20,25 hrs.) are administered to NA, adjusting its properties to meet the desired performance levels of HMA.…”

“…Test results from the Abdul-Jaleel and Najres [25] study indicated that the thermal oxidation of NA from Abu Aljeer at high temperatures under atmospheric conditions improved its chemical and physical properties, increased the ratio of asphaltene and aromatic parts, and decreased the ratio of saturated and resinous parts. The study also revealed a relationship among the chemical content of asphalt, oxidation processes, and the stability of the colloidal state.…”