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The conventional chlorine-based anti-icing filler poses risks of structural damage and environmental pollution during the removal of frozen pavement, and its long-term effectiveness is not guaranteed. In light of this, a novel environmentally-friendly slow-release biologically active anti-icing filler with a core-membrane structure was designed and prepared in this study. The particle morphology characteristics and composition of the slow-release biologically active anti-icing fillers were assessed using scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR). The anti-freezing and the slow-release mechanism of the slow-release biologically active anti-icing fillers were comprehensively discussed. Additionally, a service life model was developed to predict the effective anti-icing cycle and performance. The results demonstrated that the salting-out method effectively coated the antifreeze protein (AFP), maintaining its desirable appearance and achieving an ideal coating effect. After 27, 35, and 44 cycles of immersion freeze-thaw, the anti-icing packing samples with 3%, 6%, and 9% mass reached the failure state respectively. Furthermore, the modeling of the slow-release active anti-icing micro-surface service life indicated that the effective anti-icing life increased with higher dosages of the anti-icing filler. Overall, this study highlights the favorable long-lasting anti-icing effect of the slow-release biologically active anti-icing filler, offering a novel and environmentally-friendly approach to address winter asphalt pavement icing. [Display omitted] • Slow-release biologically active anti-icing fillers were designed and prepared. • The mechanism of slow-release biologically active anti-icing filler was analyzed. • A conversion model for the prediction of effective anti-icing life was established. [ABSTRACT FROM AUTHOR]

Cost and thermal stability are critical for the application of low-temperature phase change materials (PCMs) in asphalt pavements. Aliphatic eutectic phase change materials (AEPCMs) are expected to be potential candidates for new low-temperature PCMs. The objective of this study was to develop a set of low-temperature AEPCMs with a phase transition temperature of − 3.58 to 16.21 °C and a latent heat of 144.01 to 195.96 J/g in an attempt to replace tetradecane (TD). To fully evaluate the properties of low-temperature AEPCMs and TD, and the impacts of their direct incorporation into asphalt, the chemical structures, enthalpies, mass retention, economic costs, and changes in the physical and rheological properties of the modified asphalt were investigated. The results showed that AEPCMs with a phase transition temperature similar to that of TD could be obtained by eutectic crystallization and retained the chemical properties of their components. However, the latent heat decreased progressively with the increase in the number of components. The AEPCMs exhibited higher thermal stability than TD, with a maximal increase in mass retention from 37.24% to 86.66% at 180 °C. In addition, AEPCMs exhibited significant cost advantages. The most inexpensive AEPCMs synthesized in the laboratory is only 112.01 ¥/kg and an enthalpy cost of 0.57 ¥/kJ, accounting for 30.1% and 35.8% of TD cost, respectively. Incorporation of AEPCMs and TD increased the lightweight component of asphalt binders and caused damage to the conventional physical and rheological properties of asphalt binders, but polar AEPCMs had fewer deleterious effects on asphalt compared to nonpolar TD. • A set of low-temperature AEPCMs were synthesized to replace tetradecane. • AEPCMs outperform tetradecane in terms of heat stability and material cost. • AEPCMs is polar and enhances asphalt resin, whereas TD is non-polar and increases saturant. • Tetradecane impacts asphalt binder characteristics more than AEPCMs. [ABSTRACT FROM AUTHOR]