Study on Mechanical Properties of Permeable Polymer Treated Loess

Area of Science:

• Geotechnical Engineering
• Materials Science
• Civil Engineering

Background:

• Loess soil reinforcement is critical for road infrastructure performance.
• Traditional methods like cement stabilization have limitations in durability and environmental impact.

Purpose of the Study:

• To investigate the mechanical properties and durability of loess solidified with permeable polymers.
• To evaluate the effectiveness of polymer grouting compared to traditional methods.

Main Methods:

• Utilized a self-designed grouting system with permeable polymers.
• Conducted unconfined compression tests (UCS) and piezocone penetration (CPTU) tests.
• Analyzed micro-level mechanisms using Scanning Electron Microscopy (SEM), Mercury Intrusion Porosimetry (MIP), and X-ray Diffraction (XRD).

Main Results:

• Polymer grouting increased UCS by 11.83–20.99 times (3.05–5.42 MPa).
• UCS decreased with higher dry densities and water contents; service environment was the most sensitive factor.
• Solidified loess exhibited superior durability, with high strength retention after 56 days of immersion and better resistance to salt solution erosion than cement-mixed soil.

Conclusions:

• Permeable polymer grouting effectively reinforces loess, enhancing mechanical properties and durability.
• Micro-level analysis (SEM, MIP, XRD) confirmed denser soil structure and tighter particle bonding without mineral alteration.
• Polymer grouting offers a promising, durable alternative to cement stabilization for loess improvement.