Experimental evaluation of energy storage and rheological properties of bitumen incorporating pani/co pcm

Document Type : Original Article

Authors

Sayyed Ali Hosseini

Hamid Kamalinasab

Faculty of Civil Engineering, Shahrood University of Technology, Shahrood, Iran.

10.22067/jfcei.2026.97262.1396

Abstract

Extreme Increases or decreases in the temperature of asphalt mixtures causes damages such as rutting and thermal cracking in asphalt pavements. The purpose of this study is to evaluate the impact of incorporating phase-change material (PCM) as an additive in asphalt binder to control the temperature of asphalt mixture. For this purpose, polyaniline (PANI) was utilized as the shell material, while coconut (Co) oil was employed as the core phase-change material. This PCM was blended with asphalt binder at weight percentages of 3%, 7%, and 10%, A comprehensive testing program was conducted including Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Rotational Viscosity (RV), Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR), Pressure Aging Vessel (PAV), RTFO and Multiple Stress Creep Recovery (MSCR) tests. DSC results confirm an increase in the thermal energy storage capacity of the modified bitumen, demonstrating over 90% improvement in energy absorption. Analysis of the BBR data—specifically the creep stiffness (St) and m-value—indicates that the low-temperature performance grade of the pure bitumen is -12°C, while for the PCM-modified samples, it improves to -18°C.

Keywords

: Phase change material

Polyaniline

Coconut oil

Composite energy storage

Rheological properties

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