Chen Yi, Cheng Xuejiao, Gong Fangyuan, Fang Bingjie, Liu Yu
School of Highway, Chang'an University, South Erhuan Middle Section, Xi'an 710064, China.
Road and Bridge School, Zhejiang Institute of Communications, No. 1515, Moganshan Road, Hangzhou 311112, China.
Materials (Basel). 2025 Feb 24;18(5):983. doi: 10.3390/ma18050983.
In order to utilize a large amount of waste scallop shells in road engineering and develop environmentally friendly and high-performance asphalt, the impact of scallop shell powder (SSP) on the high temperature performance of base asphalt and styrene-butadiene-styrene (SBS)-modified asphalt was evaluated in this study. The effects of SSP on the conventional properties of base asphalt and SBS-modified asphalt were investigated according to penetration, softening point, ductility, and rotational viscosity at 135 °C, and recommended dosing amounts were given, respectively. The high-temperature rheological properties of SSP-modified asphalt were evaluated according to temperature sweep and multiple stress creep and recovery (MSCR) tests. The modification mechanism of SSP-modified asphalt was analyzed by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results indicated that an appropriate amount of SSP can effectively improve the consistency and shear deformation resistance of base asphalt and SBS-modified asphalt but can also affect the ductility and fatigue cracking resistance. The recommended weight amounts of SSP in base asphalt and SBS-modified asphalt were 9% and 12%, respectively. Moreover, SSP can improve the thermal stability and resistance to permanent deformation of asphalt, but excessive SSP may weaken the improvement effect of the high-temperature rheological properties of asphalt. The SSP is evenly distributed and tightly combined with asphalt at an appropriate amount, and the modification process of asphalt mainly involves physical changes.
为了在道路工程中利用大量废弃扇贝壳并开发环保高性能沥青，本研究评估了扇贝壳粉（SSP）对基质沥青和苯乙烯-丁二烯-苯乙烯（SBS）改性沥青高温性能的影响。根据针入度、软化点、延度和135℃旋转粘度，研究了SSP对基质沥青和SBS改性沥青常规性能的影响，并分别给出了推荐掺量。通过温度扫描和多重应力蠕变恢复（MSCR）试验评估了SSP改性沥青的高温流变性能。通过扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）分析了SSP改性沥青的改性机理。结果表明，适量的SSP能有效提高基质沥青和SBS改性沥青的稠度和抗剪切变形能力，但也会影响延度和抗疲劳开裂性能。基质沥青和SBS改性沥青中SSP的推荐掺量分别为9%和12%。此外，SSP能提高沥青的热稳定性和抗永久变形能力，但过量的SSP可能会削弱沥青高温流变性能的改善效果。适量的SSP与沥青均匀分布并紧密结合，沥青的改性过程主要涉及物理变化。
