摘要
为提升废旧胶粉在沥青中的相容性、施工和易性以及减少有害物质的排放,采用环烷油与废食用油(WCO)轻质组分按照不同质量比在150℃环境下作为废旧胶粉预脱硫的溶剂,然后制备脱硫胶粉改性沥青(DCRMA)。系统分析DCRMA基本性能、储存稳定性,并通过动态剪切流变实验(DSR)、弯曲梁流变实验(BBR)、旋转粘度测试、电子扫描显微镜(SEM)和傅里叶红外光谱(FTIR)分析不同溶剂配比对其高低温性能以及施工和易性的影响并揭示其机理。结果表明,预脱硫之后的胶粉表面更粗糙、不规则,且内部化学键的断裂增强了其与沥青的相容性。WCO轻质组分有助于降低旋转粘度,提升低温抗裂性及储存稳定性,而环烷油过多则对高温性能有不利影响。与传统废旧胶粉改性沥青(CRMA)相比,DCRMA在低温性能、储存稳定性与施工和易性方面表现更优,具备更广泛的工程适用性。
In order to improve the compatibility and ease of construction of waste crumb rubber in asphalt as well as to reduce the emission of hazardous substances,this paper adopts naphthenic oil and waste cooking oil(WCO)lightweight components according to different mass ratios as the solvent for predesulphurisation of waste crumb rubber at 150℃,and then prepares desulphurised crumb rubber modified asphalt(DCRMA).The basic properties and storage stability of DCRMA were systematically analysed,and the effects of different solvent ratios on its high and low temperature performance and construction ease were analysed and the mechanisms were revealed by dynamic shear rheology(DSR),bending beam rheology(BBR),rotational viscosity test,scanning electron microscopy(SEM),and fourier infrared(FTIR)spectroscopy.The results showed that the surface of the prepared desulphurised crumb rubber was rougher and more irregular,and the breakage of the internal chemical bonds enhanced the compatibility with asphalt,while the lightweight component of WCO helped to reduce the rotational viscosity and improve the low-temperature cracking resistance and storage stability,and the excess of naphthenic oils had a negative impact on the high-temperature performance.Compared with traditional crumb rubber modified asphalt(CRMA),DCRMA has better performance in low temperature,storage stability and ease of construction,and has wider engineering applicability.
作者
杨林正
杨洋
晏永
丁天雨
YANG Linzheng;YANG Yang;YAN Yong;DING Tianyu(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China;International Joint Laboratory for Green Construction and Intelligent Maintenance of Yunnan Province,Kunming 650500,China)
出处
《材料导报》
北大核心
2025年第S2期478-483,共6页
Materials Reports
基金
国家自然科学基金委地区基金(52368043)。
关键词
低温脱硫
改性沥青
废旧胶粉
流变性能
low-temperature desulfurization
modified asphalt
waste crumb rubber
rheological property
