Road Performance of Red Mud Composite Solidification Agent for Solidified Silt and Its Mechanism
WU Weijun
ZHANG Kunpeng
ZHANG Ning
DING Beidou
WANG Jiahui
Abstract：Red mud composite stabilizers,composed of industrial wastes such as red mud,carbide slag,and desulfurized gypsum,were used to solidify low liquid limit silt.The changes in mechanical properties(unconfined compressive strength and splitting strength)and durability(water stability and dry-wet cycle)of the solidified silt were explored.Additionally,scanning electron microscopy(SEM)and X-ray diffraction(XRD)were employed to analyze the solidification mechanism of red mud composite solidification agent.The results show that the unconfined compressive strength and splitting strength of solidified silt increase with both the increasing content of the stabilizer and the extension of curing age.When the content of red mud composite solidification agent is increased from 8%to 24%and the age of maintenance is extended from 7 d to 28 d.The water stability coefficient improves from 69.5%to 82.4%.After 12 dry-wet cycles,the strength loss rate of stabilized silt reaches 35.14%.When the red mud composite stabilizer is incorporated into the silt,hydration reactions occur,forming gelatinous calcium silicate hydrate(C-S-H)and calcium aluminate hydrate(C-A-H)gels.Simultaneously,C-A-H reacts with CaSO4 to produce ettringite(AFt)crystals.The C-S-H and C-A-H gels encapsulate and fill the soil particles,while the AFt crystals interpenetrate the soil particles,integrating them into a whole and effectively enhancing the road performance of solidified silt.
Keywords：red mudlow liquid limit siltroad performancesolidification mechanism
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 227-235 )