Abstract
Hydroxymethyl carbon black (HCB) was prepared as an asphalt modifier with a high oxygen content and active surface chemical properties. The microstructure of HCB was analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier-transform infrared spectroscopy. The improvement effect of HCB on asphalt’s physical, dynamic shear, rheological, and aging properties was evaluated. To analyze the dynamic properties of the HCB-modified asphalt mixtures, a simple performance test (SPT) was conducted, and then the change laws of the dynamic modulus and phase angle for the HCB mixtures were clarified. The results showed that the surface of HCB is smooth and that the oxygen content increases with the generation of hydroxyl functional groups. Polar oxygen-containing functional groups and hydrogen bonds are helpful in improving the resistance to cracking and aging. The surface activity of HCB is susceptible to temperature and frequency, causing a slight influence of HCB on the viscoelasticity of asphalt mixtures at high and low frequencies. At low temperatures and high frequencies, the HCB enhanced the elasticity characteristics and weakened the viscosity characteristics of asphalt mixtures.
Highlights
Processing waste materials into asphalt modifiers can effectively improve the performance of asphalt and its mixtures, and achieve sustainable utilization of waste materials [1,2]
Hydroxymethyl carbon black (HCB) reduced the penetration of asphalt by 10 mm, the softening point increased by 3 °C, the ductility increased by 0.7 cm, and the viscosity increased by 0.05 pa.s
HCB reduced the penetration of asphalt by 10 mm, the softening point increased by 3 ◦ C, the ductility increased by 0.7 cm, and the viscosity increased by 0.05 pa.s
Summary
Processing waste materials into asphalt modifiers can effectively improve the performance of asphalt and its mixtures, and achieve sustainable utilization of waste materials [1,2]. Chen et al [14] ascertained the temperature susceptibility of styrene–butadiene–styrene (SBS) modified asphalt with white carbon black. An asphalt mixture counts as a typical multiphase granular material, of which the viscoelastic dynamic response is bound by the rutting, cracking, and fatigue of asphalt pavement [16,17,18]. Based on the above problems, this investigation hydroxylated carbon black to improve the performance of asphalt and its mixtures. The physical and rheological properties of HCB-modified asphalt were analyzed and the modification mechanism of hydroxymethyl carbon black (HCB) was revealed
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