Modification of the Thermal and Mechanical Properties of Asphaltic Materials Using Biopolymers Derived from Nanochitosan
نویسندگان
1 Department of Chemistry, Faculty of Education for Pure Science, University of Mosul, Mosul, IRAQ
2 Department of Petroleum and Refining Engineering, Faculty of Petroleum and Mining Engineering, University of Mosul, Mosul, IRAQ
doi
10.30492/ijcce.2025.2066349.7203چکیده
Pavement deterioration due to thermal cracking and fatigue is one of the most significant challenges facing road and infrastructure engineering, especially in areas with harsh climate conditions. Many conventional asphalt modifiers often fail to address this problem; this has led to increased interest in modern materials such as biopolymers derived from nanomaterials. This research aims to improve thermal and mechanical properties of local asphalt produced from AL-Doura refinery with a new methodology by adding new polymers prepared from nanochitosan: crosslinked polymer (SCNCS) and crosslinked polymer (SVCNCS), which were characterized using TGA, EDX techniques using different weights of both polymers ranging from 1-5 %wt. in the presence of 0.5% Polyphosphoric acid (PPA) at 180°C for 1h. Rheological properties of the modified samples were measured, including ductility, penetration, softening point, and PI. The best modified samples were selected, and the optimum conditions for the modification process were determined, including temperature, reaction time, and the percentage of added PPA. The best modified samples obtained (As24), (As27) were taken and characterized by FT-IR, XRD, FESEM, TGA techniques, and were subjected to the Marshall test, chemical immersion, and Thin Film Oven Test (TFOT) test. The study gave excellent results regarding the asphalt's resistance to deformation processes and its anti-aging properties.
