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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2026, Vol. 45 ›› Issue (2): 725-734.DOI: 10.16552/j.cnki.issn1001-1625.2025.0449

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Strength and Dry-Wet Cycle Resistance of Magnesium Oxide-Activated Ground Granulated Blast Furnace Slag-Basalt Fiber Stabilized Shield Residues

CAO Wei1(), LI Xinyang2, LIU Fuyou2()   

  1. 1. China Railway First Survey and Design Institute Group Co. ,Ltd. ,Xi’an 710043,China
    2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China
  • Received:2025-04-30 Revised:2025-09-24 Online:2026-02-20 Published:2026-03-09
  • Contact: LIU Fuyou

Abstract:

In this paper, the shield residues solidified by magnesium oxide (MgO)-activated ground granulated blast furnace slag (GGBS)-basalt fiber (referred to as “modified samples”) were studied, aiming to explore the improvement effect of this curing agent (MgO-activated GGBS-basalt fiber) on the engineering properties of shield residues. The dosage of the curing agent accounts for 8%, 15% and 30% of the dry mass of shield residues, and the dry mass ratio of MgO to GGBS (m(MgO)∶m(GGBS)) ranges from 1∶9 to 1∶3. The strength and dry-wet cycle resistance of the modified samples were evaluated via unconfined compressive strength tests and modified dry-wet cycle tests (under acidic sulfate condition, pH=5.0), with cement stabilized shield residues serving as the control group. The results show that: after 120 d of standard curing, the unconfined compressive strength of the modified sample with m(MgO)∶(GGBS)=1∶7 is 4%~24% higher than that of modified samples with other ratios. The pH value of the modified samples is 4%~7% lower than that of the control group. The mass variation and cumulative mass variation of both the modified samples and the control group increase gradually with the increase in the number of dry-wet cycles. After 10 dry-wet cycle tests, the unconfined compressive strength of the modified samples decreases by 22%, while that of the control group decreases by 52%. In conclusion, the shield residue samples solidified by MgO-activated GGBS-basalt fiber (modified samples) exhibit superior strength and dry-wet cycle resistance.

Key words: MgO-activated GGBS, basalt fiber, shield residue, dry-wet cycle, stabilization

CLC Number: