|Table of Contents|

Rheological and smoke suppression properties of sepiolite-modified asphalt(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年5期
Page:
15-29
Research Field:
道路工程
Publishing date:

Info

Title:
Rheological and smoke suppression properties of sepiolite-modified asphalt
Author(s):
WEI Jian-guo1;  ZOU An-min1; 2;  LI Yi-liang1;  HUANG Mei-yan1; 3; ZHANG Kai1;  ZHOU Yu-ming1
(1. School of Transportation, Changsha University of Science and Technology, Changsha 410114, Hunan, China; 2. Beijing Sino-Aero Construction Engineering Co., Ltd., Beijing 101300, China; 3. Department of Municipal and Road and Bridge Engineering, Hunan Urban Construction College, Xiangtan 411101, Hunan, China)
Keywords:
road engineering;  sepiolite;  rheological property;  smoke suppression property;  gas chromatography-mass spectrometry coupling
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2025.05.002
Abstract:
To promote the application of sepiolite in asphalt pavement engineering, the Donghai-70 base asphalt and high-purity sepiolite were selected, two methods named as the organic modification and surface modification were used to treat the sepiolite, and the comprehensive properties of original, organically modified, and surface modified sepiolite asphalt were compared through the gas adsorption for specific surface area analysis, dynamic shear rheometer(DSR), temperature(46 ℃-82 ℃)sweep, and low-temperature(5 ℃)ductility test. Based on the screening results, the high-temperature rutting resistance, low-temperature crack resistance, and fatigue life of sepiolite-modified asphalts with varying contents(2%, 4%, 6%, and 8%)were evaluated through the multiple stress creep recovery(MSCR)test, low-temperature bending beam rheometer(BBR)test, and linear amplitude sweep(LAS). The smoke composition of sepiolite-modified asphalt was analyzed via the gas chromatography-mass spectrometry(GC-MS)coupling. The microscopic interaction mechanisms were elucidated by combining the scanning electron microscopy(SEM), fluorescence microscopy(FM)imaging, gel permeation chromatography(GPC)and Fourier transform infrared(FTIR)spectroscopy. The research findings indicate that the rutting factor of the sepiolite-modified asphalt increases with the rise in sepiolite content, with the optimal high-temperature performance at content of 4%-6%. The best low-temperature performance achieves at content of 4%, while the fatigue life enhances at content of 2%-4%, and a significant improvement effect is at content of 2%. Although the specific surface area of sepiolite increases after organic modification and surface modification, the overall performance of the asphalt mixed with the modified sepiolite is inferior to that of the original sepiolite-modified asphalt. The physical addition of sepiolite can significantly improve the high-temperature performance, low-temperature performance and fatigue performance of the asphalt, with varying degrees of improvement for each performance at different contents. Additionally, the porous structure of sepiolite also provides a good smoke suppression effect. In summary, the research results provide theoretical supports and practical basis for the practical application of sepiolite in the field of asphalt modification for road engineering.1 tab, 16 figs, 43 refs.

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Last Update: 2025-09-30