摘要
硅藻土作为沥青及沥青混合料改性剂的研究已历时较长,为进一步给硅藻土在改性沥青的应用提出合理建议,采用动态剪切流变试验(DSR)、弯曲蠕变劲度试验(BBR)以及多应力蠕变恢复试验(MSCR)对不同硅藻土掺量与细度沥青胶浆性能进行研究,采用傅立叶变换红外吸收光谱仪(FTIR)及扫描电镜试验(SEM)对硅藻土在沥青中的作用机理进行分析。试验结果表明:硅藻土掺量从10%增至20%、细度由200目增至800目范围内,硅藻土改性沥青胶浆高温抗永久变形能力随掺量和细度目数增加不断提升,但提升幅度逐渐降低;硅藻土对沥青低温性能起负面作用,在同一掺量条件下,硅藻土细度对低温性能的影响并不显著;硅藻土对沥青的改性效果主要取决于硅藻土的物理性质及二者之间的共混程度。研究结果表明,硅藻土可以有效改善沥青的高温性能,且对沥青的低温性能影响程度不大,综合考虑性能与经济性,建议硅藻土掺量为20%,细度选用500目。
The research on diatomite as a modifier for asphalt and asphalt mixtures has been going on for a long time.In order to provide reasonable suggestions for the application of diatomite in modified asphalt,dynamic shear rheology test(DSR),bending creep stiffness test(BBR)and multi-stress creep recovery test(MSCR)were used to study the performance of asphalt slurry with different diatomite content and fineness.Fourier transform infrared absorption spectrometer(FTIR)and scanning electron microscopy(SEM)were used to analyze the mechanism of diatomite on asphalt.The results show that:the high-temperature resistance to permanent deformation of diatomite modified asphalt slurry continuously increases within the range of increasing the content of diatomite from 10%to 20%and increasing the fineness mesh from 200 mesh to 800 mesh,but the degree of improvement gradually decreases.Diatomite has a negative effect on the low-temperature performance of asphalt,and under the same dosage conditions,the influence of the fineness of diatomite on the low-temperature performance is not significant.The modification effect of diatomite on asphalt mainly depends on the physical properties of diatomite and the degree of blending between the two.The research results show that diatomite can effectively improve the high temperature performance of asphalt,and its impact on the low-temperature performance of asphalt is not significant.Considering both performance and economy comprehensively,it is recommended that the amount of diatomite is 20%,and the fineness is 500 mesh.
作者
刘莉萍
闫铁成
杜婷
郭建博
LIU Liping;YAN Tiecheng;DU Ting;GUO Jianbo(College of Civil Engineering,Longdong University,Qingyang 745000,Gansu,China;Provincial Key Laboratory of Engineering Properties and Applications of Loess in Colleges and Universities of Gansu Province,Qingyang 745000,Gansu,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第10期61-68,共8页
Journal of Chongqing Jiaotong University(Natural Science)
基金
甘肃省高等学校创新基金项目(2021A-126)。
关键词
道路工程
硅藻土
掺量
细度
沥青性能
highway engineering
diatomite
content
fineness
asphalt performance
