|Table of Contents|

Healing performance of steel fiber reinforced iron tailings hot mix asphalt heated by microwave(PDF)

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

Issue:
2025年2期
Page:
1-13
Research Field:
道路工程
Publishing date:

Info

Title:
Healing performance of steel fiber reinforced iron tailings hot mix asphalt heated by microwave
Author(s):
JI Xiao-ping1;  HU Hao-chen1;  SUN Yun-long1; 2; 3;  YI Ke4
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Xinjiang Academy of Transportation Science Co. Ltd., Urumqi 830099, Xinjiang, China; 3. Key Laboratory of Transport Industry of Highway Engineering Technology in Arid Desert Areas, Xinjiang Transportation Investment (Group)Co. Ltd., Urumqi 830099, Xinjiang, China; 4. Wuhan Comprehensive Transportation Research Institute Co. Ltd., Wuhan 430000, Hubei, China)
Keywords:
road engineering;  iron tailing;  hot mix asphalt;  healing;  microwave heating
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2025.02.001
Abstract:
To verify the enhancement effect of iron tailings on the microwave heating healing of hot mix asphalt, the iron tailings were mixed with natural crushed stones in different proportions to prepare iron tailings hot mix asphalt(IT-HMA), and the road performance was evaluated. Through microwave heating temperature rise tests and healing tests, the effects of iron tailing content, steel fiber content, healing environment, and microwave heating parameters on the temperature rise characteristics and healing performance of IT-HMA were investigated. The research results indicate that when the iron tailing content exceeds 60%, the road performance of IT-HMA no longer meets the specification requirements. After adding 1% and 2% steel fibers to IT-HMA with iron tailing contents of 60% and 80%, respectively, the road performance significantly improves and meets the specification requirements. As the iron tailing and steel fiber contents increase, the microwave heating temperature rise rate of IT-HMA becomes faster with a greater temperature rise, resulting in a substantial enhancement in the healing effect. The primary reason for this improvement is that iron tailings and steel fibers increase the microwave absorption capacity of the asphalt mixture, thereby enhancing the flowability of the asphalt at the fracture interface. With 80% iron tailings and 2% steel fibers, the healing performance reaches 1.91 times that of the control group. Compared to the service condition of dry pavement at room temperature, the healing performance of IT-HMA after water immersion and freeze-thaw conditioning decreases by at least 13% and 43%, respectively, with more severe damage resulting in poorer healing effect. Therefore, the microwave heating repair should be performed promptly before rainy or winter seasons. The healing performance of IT-HMA initially increases but then decreases with the extension of single microwave heating duration and gradually declines with the increase in the microwave heating frequency. Both the excessive microwave heating duration and frequent microwave heatingimpair the healing performance. The research results reveal the changing patterns of healing performance of IT-HMA under the microwave heating, at the same time, they provide a theoretical foundation for the high-value utilization of iron tailings in asphalt pavement.11 tabs, 12 figs, 38 refs.

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Last Update: 2025-04-01