- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | HE Jingyuan, GAO Weihao, ZHANG Jian, WANG Chuan, LI Zhaofeng, YOU Hao. Freeze-Thaw Resistance of Red Mud-Based Stabilized Crushed Stone[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230350
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In order to achieve the safe application of red mud-based cementitious materials in road engineering, the mechanical properties and quality of red mud-based stabilized crushed stone base under freeze-thaw cycles were studied. The influence of freeze-thaw cycle temperature and number on mechanical properties and quality loss was explored by industrial CT scanning and SEM-EDS. Research has shown that when the temperature ranges from 20 ℃ to −20 ℃ for 28 days, the maximum quality loss rate of the cementitious material with a 5% dosage is 1.85%. The change in quality loss rate of stabilized crushed stone with 5% and 6% red mud-based cementitious materials is higher than that with 7% and 8% red mud-based cementitious materials. In addition, with the increase in freeze-thaw cycles, the quality loss rate continues to increase. Through industrial CT and SEM-EDS microscopic analysis, as the number of freeze-thaw cycles increases, the porosity of stabilized crushed stone increases. After the stabilized crushed stone undergoes 28 days of curing and 20 freeze-thaw cycles with a 6% dosage, the porosity increases by 1.53%, and internal crack damage increases and accumulates continuously, showing a changing pattern from less to more and from narrow to wide. The research results have a positive role in promoting the green construction of transportation engineering and the large-scale application of red mud.
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