Rheological properties and mechanism of fumed SiO2 modified asphalt

被引：0

作者：

Li S. ^{[1
]}

Yan C. ^{[2
]}

Zhou S. ^{[2
]}

机构：

[1] Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an

[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 11期

基金：

中国国家自然科学基金;

关键词：

fumed SiO[!sub]2[!/sub] (FS); hydroclusters; rheological property; surface modified; variable temperature infrared spectroscopy;

D O I：

10.13801/j.cnki.fhclxb.20230203.002

中图分类号：

学科分类号：

摘要：

Nano-silica (NS) modified asphalt is satisfactory in mechanical properties but is expensive. Fumed-silica (FS) is also a nanoscale material and the price is only 1/10 of NS. To evaluate the feasibility of FS replacing NS, using 3wt% original silica (OS), FS, hydrophobic nano silica (MNS) as modifier, the rheological properties of corresponding modified asphalt were studied compared with matrix asphalt (Esso, ES) by the multi-stress creep recovery test (MSCR), linear amplitude scanning test (LAS) and bent beam rheological test (BBR). The results show that the optimal modifier FS has the best effect on the rutting resistance at high temperature and the fatigue resistance at intermediate temperature for asphalt, and the least negative effect on the low temperature performance. The mechanism for these results was explored by SEM, temperature scanning test (TeS), variable temperature infrared spectroscopy (VT-IR), TGA and DSC. The intrinsic primary aggregates of FS and unique ES-hydroclusters system played a key role in the performance of FS-asphalt composite. Therefore, fumed SiO2 is a cost-effective nano-scale material used to modify asphalt. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

页码：6275 / 6287

页数：12

共 47 条

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