Road Performance of Lime-Fly Ash Stabilized Sedimentary Silt in the Lower Reaches of the Yellow River
YU Shuhui
LIU Yan
ZHANG Shuming
ZHOU Xiang
YANG Fan
Abstract：To explore the application of sediment silt in the lower reaches of the Yellow River in roadbase engineering,lime and fly ash were used to improve its properties.Resilient modulus test,direct shear test,and ultimate bearing capacity calculation were conducted to analyze the road performance of the sediment modified by these two materials.The results show that when the fly ash blending ratio exceeds 40%,regardless of the lime content value,the resilient modulus of binary ash improved Yellow River sedimentary silt meets the control requirements of specification JTG 3441-2024 Test Procedures for Stabilized Materials with Inorganic Binders in Highway Engineering,but the effect on improving the anti-shear strength index is limited.However,when the lime content exceeds 4%,the resilient modulus of the two-material-modified Yellow River sediment silt significantly increases compared to when the lime content is less than 4%,although the improvement in shear strength indices slows down.Considering ultimate bearing capacity,time-effectiveness,and cost-benefit analysis,the optimal improvement scheme for Yellow River sediment silt is determined to be a combination of 4%lime and 40%fly ash with a curing age of 7 days.
Keywords：roadbed engineeringinorganic material improvementYellow River sediment siltultimate bearing capacitymicrostructure
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 565-572 )