Study on the Technical Properties and Ice Suppression Effect of Slow- Release Salt-Modified Asphalt mastic

To systematically evaluate the road performance and ice-suppression efficacy of slow-release salt asphalt mastic, this study prepared a series of asphalt mastic specimens using equal quantities of slow-release salts (Types A and B) as mineral powder substitutes. The investigation examined the impact of slow-release salt incorporation on asphalt mastic properties. Pen penetration and softening point were employed to preliminarily analyse the effects of replacement rate and salt type on conventional asphalt mastic properties. Dynamic shear rheometry (DSR), bending beam rheometry (BBR), and scanning electron microscopy (SEM) were utilised to systematically elucidate the mechanisms governing the rheological characteristics of mastics under varying salt types and dosages. Torsion tests were employed to indirectly evaluate the de-icing performance of each asphalt mastic specimen. Results indicated that incorporation of slow-release salt A reduced the penetration and increased the softening point of the asphalt mastic, enhancing its high-temperature stability while diminishing low-temperature performance. The impact on low-temperature properties became significant at substitution levels exceeding 20%. The incorporation of slow-release salt B had a lesser effect on low-temperature performance but diminished high-temperature deformation resistance. Torsion tests revealed that asphalt mastic incorporating slow-release salt A demonstrated superior snow-melting efficacy. Considering these factors comprehensively, the selection of slow-release salt A at a dosage below 20% is deemed appropriate. This research provides a theoretical basis for the development of functional pavement materials.