Study on the Road Performance of Granite Residual Soil Improvedby Calcium Lignosulfonate

  • Zhu Wenxi ,
  • Deng Huafeng ,
  • Li Jianlin ,
  • Xiong Yu ,
  • Cheng Lei
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  • 1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Yichang, Hubei 443002, P.R. China;
    2. College of Civil Engineering & Architecture, China Three Gorges University, Yichang, Hubei 443002, P.R. China

Received date: 2024-06-27

  Online published: 2025-05-06

Abstract

In order to improve the granite residual soil to meet the needs of embankment filling, considering the characteristics of calcium lignosulfonate, the test of improving granite residual soil with calcium lignosulfonate was designed and carried out. The macroscopic physical and mechanical test, indoor model test and microscopic test were carried out to systematically analyze whether calcium lignosulfonate could meet the needs of embankment filling and the improvement mechanism. The results show that: (1) The addition of calcium lignosulfonate effectively improves the road performance of granite residual soil. The content of calcium lignosulfonate reaches the best at 4.00%. Compared with before improvement, the liquid limit is reduced by 32.28%, the plastic limit is reduced by 40.06%, the optimum moisture content is reduced by 18.63%, and the bearing ratio is increased by 567.09%. (2) The incorporation of calcium lignosulfonate significantly improved the mechanical properties of granite residual soil. The compressive strength of the solidified body increased by 61.12%~126.11%, the internal friction angle increased by 13.08%~37.74%, and the cohesion increased by 108.50%~379.86% under the dosage of 2.00%~8.00%. (3) There are two main aspects of the enhancement mechanism of calcium lignosulfonate modified granite residual soil. On the one hand, after the hydrolysis of calcium lignosulfonate, it can undergo protonation reaction to form lignin polymer, which can cement the soil and improve the mechanical properties. On the other hand, the calcium ions hydrolyzed from calcium lignosulfonate form a typical carbonate cementing material CaMg (CO3)2 through ion exchange reaction, and the carbonate cementing strength is higher than that of clay minerals.

Cite this article

Zhu Wenxi , Deng Huafeng , Li Jianlin , Xiong Yu , Cheng Lei . Study on the Road Performance of Granite Residual Soil Improvedby Calcium Lignosulfonate[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(2) : 523 -532 . DOI: 10.20174/j.JUSE.2025.02.19

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