Optimizing Mechanical and Microstructural Properties of Sandy Clayey Silt Stabilized with Lignin Fiber and Cement Synergy

Shuangfeng Guo^1,2, Xiaoyi Jiang³, Zhihua Zhang⁴

¹College of Transportation Engineering, Nanjing Tech University, Nanjing 211816, China.

Polymers

|June 13, 2025

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View abstract on PubMed

Summary

Adding lignin fiber and cement to sandy clayey silt soil significantly improves its strength for construction. Optimal results were achieved with 4% lignin fiber and 4% cement, enhancing soil stabilization.

Area of Science:

Geotechnical Engineering
Materials Science
Sustainable Construction

Background:

Soil stabilization is crucial for engineering construction, with natural materials offering sustainable alternatives.
Lignin fiber and cement are investigated for their potential to enhance soil mechanical properties.

Purpose of the Study:

To evaluate the synergistic effects of lignin fiber and cement on sandy clayey silt stabilization.
To determine optimal content of lignin fiber and cement for improved soil mechanical properties.

Main Methods:

Factorial experimental design with varying lignin fiber (0-8%) and cement (0-4%) contents.
Unconfined Compressive Strength (UCS) tests on 180 samples across four curing periods.
Microstructural analysis using Scanning Electron Microscopy with Energy Dispersive X-ray spectroscopy (SEM-EDX).

Main Results:

A critical lignin fiber content of 4% was identified; higher percentages decreased UCS by 15-20%.
Optimal mix (4% lignin fiber, 4% cement) showed a 139% UCS increase after 30 days.
SEM-EDX confirmed lignin fiber enhances ductility and cement hydration reduces particle detachment.

Conclusions:

Lignin fiber and cement exhibit synergistic effects in stabilizing sandy clayey silt.
The study provides a quantitative framework for optimizing lignin fiber-cement stabilization in geotechnical applications.
Findings support the use of natural materials for sustainable engineering construction.

Keywords:

cement engineering waste soil lignin fiber microstructure sandy clayey silt unconfined compressive strength

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