Open Access

ARTICLE

Development of SBS composite modified asphalt incorporating polydopamine-enhanced MoS₂

Y. L. Hou^*, L. Z Bai

Department of Railway Engineering, Zhengzhou Railway Vocational and Technical College, Zhengzhou 451460, China

* Corresponding Author:

Chalcogenide Letters 2024, 21(10), 785-796. https://doi.org/10.15251/CL.2024.2110.785

Received 27 June 2024; Accepted 07 October 2024;

Abstract

This study investigated the development of a novel composite modified asphalt incorporating PDA-MoS₂ into styrene-butadiene-styrene (SBS) modified asphalt. The successful synthesis of PDA-MoS₂ was confirmed through various characterization techniques. The incorporation of PDA-MoS₂ into SBS modified asphalt resulted in significant improvements in performance properties. With a PDA-MoS₂ content of 0.7 wt%, the modified asphalt showed a notable 15.1% rise in softening point and a 24% drop in penetration in comparison to the control SBS modified asphalt. Dynamic Shear Rheometer tests revealed a 2.4-fold increase in the rutting factor at 60°C. Multiple Stress Creep Recovery tests demonstrated enhanced rutting resistance, with a 72.2% reduction in nonrecoverable creep compliance at 0.1 kPa stress level. Electrochemical measurements showed improved corrosion resistance, evidenced by lower current densities and higher charge transfer resistance. Microstructural analysis revealed well-dispersed PDA-MoS₂ particles forming a compact network structure within the asphalt matrix. The hydrophilicity of the modified asphalt increased, with a 35.3% decrease in water contact angle. The synergistic effect between PDA-MoS₂, SBS, and asphalt components, facilitated by enhanced interfacial interactions and chemical bonding, contributed to the observed performance improvements. The results indicate that PDA-MoS₂ has the potential to improve the characteristics of SBS modified asphalt as a modifier.

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Keywords

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