Shu Benan, Zeng Guodong, Ma Yunlong, Ren Yanfei, Zhu Maocong
National Engineering Research Center of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China.
Foshan Transportation Science and Technology Co., Ltd., Foshan 528000, China.
Materials (Basel). 2024 Oct 18;17(20):5099. doi: 10.3390/ma17205099.
In this study, an aging asphalt mixture was regenerated by a waste-based rejuvenator and cemented by solid waste-based solidification materials (SSMs). A splitting test, wheel tracking test, and three-point bending test were conducted to evaluate the properties of the regenerated asphalt mixture (RAM). The results reveal that the properties of the asphalt mixture were not diminished or were moderately enhanced by the 30% substitution of RAP. With the substitution of RAP to 100%, the splitting tensile strength, dynamic stability, and splitting strength ratio were decreased by 13%, 15%, and 5%, respectively. With the 100% substitution of SSMs for cement, the compressive strength, dynamic stability, flexural strain, and splitting strength ratios of the RAM were increased by 40%, 32%%, 14%, and 8%, respectively. The lightweight components can be supplemented, and low-temperature deformation and interlayer flowability can be improved by the incorporation of the rejuvenator. The generation of hydrated calcium silicate and ettringite for SSMs is greater than those of cement. The massive generation of ettringite has been observed to increase the solid phase volume by 120%, which may facilitate a more complete filling of the remaining pores in the RAM due to water evaporation. The regeneration and cement on green and the high performance of the rejuvenator and the SSM markedly enhanced RAM performance.
在本研究中，一种老化沥青混合料通过基于废料的再生剂进行再生，并由基于固体废物的固化材料（SSM）进行胶结。进行了劈裂试验、车辙试验和三点弯曲试验，以评估再生沥青混合料（RAM）的性能。结果表明，用30%的RAP替代后，沥青混合料的性能未降低或略有提高。当RAP替代率达到100%时，劈裂抗拉强度、动稳定度和劈裂强度比分别降低了13%、15%和5%。用100%的SSM替代水泥后，RAM的抗压强度、动稳定度、弯曲应变和劈裂强度比分别提高了40%、32%、14%和8%。再生剂的掺入可以补充轻质组分，并改善低温变形和层间流动性。SSM生成的水化硅酸钙和钙矾石比水泥生成的更多。已观察到大量生成的钙矾石使固相体积增加了120%，这可能有助于由于水分蒸发而更完全地填充RAM中剩余的孔隙。再生剂和SSM的绿色环保性以及高性能显著提高了RAM的性能。
