Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (1): 43-53.doi: 10.16285/j.rsm.2022.5252

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Strength characteristics and mechanism analysis of fiber reinforced highly cohesive tailings solidified using high-calcium geopolymer

LI Yuan1, 2,3, 4, WEI Ming-li1, 3, 5, LIU Lei1, 3,4,6, WEI Wei1, 2 , CHEN Yi-jun1, 3, 6   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 4. IRSM-CAS/HK Poly. Univ. Joint Laboratory on Solid Waste Science, Wuhan, Hubei 430071, China 5. Jiangsu Institute of Zoneco Co., Ltd., Yixing, Jiangsu 214200, China 6. Wuhan CAS-ITRI Solid Waste Resources Co., Ltd., Wuhan, Hubei 430070, China
  • Online:2023-01-17 Published:2023-03-13
  • Contact: LIU Lei, male, born in 1982, PhD, Professor, research interests: safe disposal of solid waste. E-mail: E-mail:
  • About author:LI Yuan, male, born in 1996, PhD candidate, focusing on environmental geotechnical engineering.
  • Supported by:

    the Special Fund for Basic Research on Scientific Instruments of the National Natural Science Foundation of China (51827814); the Major Science and Technology Project of Inner Mongolia Autonomous Region (No. E139320101) and the Foundation for Distinguished Young Scholars of Hubei Province (2021CFA096).


Solidification treatment of highly cohesive tailings is one of the important means for resource utilization. Highly cohesive iron tailings were taken as the object to carry out strength characteristic experiments of solidified tailings using high-calcium geopolymer to analyze the impacts of different dosages of chopped basalt fiber and dry-wet cycles. The micro-cementation behavior, unconfined compressive strength, and the response parameters after dry-wet cycles (strength, mass loss, and electrochemical properties) of the fiber-reinforced solidified materials were discussed. It is concluded that: 1) Adding fiber increased the strength. 0.5% was the optimal dosage (strength increased by 29.1%), which is equivalent to reducing the dosage of geopolymer by about 2%. 2) Fiber, hydration products and tailings were bonded by cementation and frictional occlusion. An appropriate amount of fiber could reduce pore connectivity and increase the capillary water holding capacity. 3) The dry-wet cycles destroyed the cementation, and the damage was stable after the sixth cycle. The fiber has no obvious advantage in improving the dry-wet durability of the solidified materials. The above results provide theoretical support and method reference for clarifying the strength characteristics and durability of solidified tailings.

Key words: highly cohesive iron tailings, chopped basalt fiber, high-calcium geopolymer, micro-cementation behavior, dry-wet cycles