Abstract
One of the most frequently applied materials in cold weather is deicer, which is utilized to maintain winter roads. The effect of various deicers on moisture sensitivity has been explored by researchers in the asphalt industry; however, their effect on thermodynamic parameters and fatigue behavior of asphalt has rarely been studied. In this study, the effect of NaCl, potassium acetate, and calcium magnesium acetate deicers on fatigue and moisture performances of asphalt was explored using nano hydrated lime. Two prediction models of fatigue life ratio (NfR) and tensile strength ratio (TSR) were presented using genetic programming and group method of data handling to obtain optimal nano hydrated lime content. Finally, according to the results of deicer-forming minerals, two new optimal deicers were obtained, and their effect on TSR and NfR was compared with the three above-mentioned deicers. Results showed that TSR and NfR of calcium magnesium acetate saturated samples were higher than those of NaCl and potassium acetate saturated samples. Moreover, by modifying the properties of bitumen with nano hydrated lime, adhesion free energy, cohesion free energy, and debonding energy amounts increased, which indicates an increase in locking between aggregates and bitumen. By determining the minerals that make up deicers using the energy-dispersive X-ray test, two new deicer compounds were made that had better performance over NaCl and potassium acetate. By optimizing additive percentage in genetic programming method (due to higher accuracy), 1.05% nano hydrated lime was proposed as the best optimal amount for the new optimal deicer to simultaneously increase TSR and NfR.
Published Version
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