Road Performance Research and Application of Stabilized Silt Subgrade with Slag-Based Cementitious Materials

doi:10.16552/j.cnki.issn1001-1625.2025.0482

Abstract

Abstract: In this study, alkali-activated cementitious materials were developed through the synergistic activation of ground blast furnace slag (GGBS) with calcium hydroxide (Ca(OH)₂) and sodium sulfate (Na₂SO₄) for silt improvement. Cement stabilization was employed as a control group to address the deficiencies of poor gradation and low strength in silt when used as roadbed filler. Single-factor experiments were conducted to determine the optimal dosage ranges of the three curing materials, and the mix ratio of the composite curing agent was further optimized using the response surface methodology. Additionally, laboratory mechanical property tests were performed on solidified silt to investigate the influence of varying dosages of solidifying agents on the unconfined compressive strength, split tensile strength, and California bearing ratio (CBR) of solidified silt at different curing ages. Based on the laboratory findings, field trials were carried out on solidified silt subgrade fillers for the Anyang-Luoshan expressway section. The results confirmed that the silt subgrade stabilized with the composite curing agent exhibited excellent road performance. Test results indicates that the optimal mass mix ratio of slag, calcium hydroxide, and sodium sulfate is 19.75:10.86:1. The unconfined compressive strength and splitting tensile strength of the composite-stabilized soil increases with both the curing age and the dosage of the curing agent. The CBR value of the composite-stabilized soil with a 4% (mass fraction) dosage reached 27.96%, satisfying the bearing ratio requirements and being approximately 17.95% higher than that of the cement-stabilized soil with the same dosage. The compaction degree, dynamic cone penetrometer index (DCPI), CBR value, and deflection value of the test section of the slag-based solidified silt subgrade met the design specifications, demonstrating good application effects. This approach can be widely promotes for silt subgrade fillers.

Key words: improved silt, ground granulated blast slag, road performance, field test, response surface method

CLC Number:

U416.1

WU Weijun, DING Beidou, ZHANG Kunpeng. Road Performance Research and Application of Stabilized Silt Subgrade with Slag-Based Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3747-3760.

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