TY  - EJOU
AU  - Zou, Baoping 
AU  - Yin, Jiahao 
AU  - Cao, Chunhui 
AU  - Long, Xu 

TI  - Mechanical Performance Analysis of Rubber Elastic Polymer-Polyurethane Reinforced Cement-Based Composite Grouting Materials
T2  - Journal of Polymer Materials

PY  - 2025
VL  - 42
IS  - 1
SN  - 0976-3449

AB  - The ongoing operation of subway systems makes existing tunnels vulnerable to deformations and structural damage caused by adjacent foundation pit construction. Such deformations-manifesting as horizontal displacement, heightened lateral convergence, and internal force redistribution-may significantly compromise subway operational safety. Grouting remediation has become a widely adopted solution for tunnel deformation control and structural reinforcement. Developing optimized grouting materials is crucial for improving remediation effectiveness, ensuring structural integrity, and maintaining uninterrupted subway operations. This investigation explores the substitution of fine mortar aggregates with 0.1 mm discarded rubber particles at varying concentrations (0%, 3%, 6%, 9%, 12%, and 15%). Experimental parameters included three water-cement ratios (0.65, 0.70, and 0.75) with constant 4% WPU content. Mechanical properties including compressive strength, flexural strength, and compression-to-bending ratio were evaluated across specified curing periods. Material characterization employed Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy for molecular analysis and Scanning Electron Microscopy (SEM) for microstructural examination. Results indicate optimal toughness at 0.70 water-cement ratio with 6% rubber content, meeting mechanical pumping specifications while maintaining structural performance.
KW  - Rubber particles; polymer; polyurethane; grouting material; mechanical properties

DO  - 10.32604/jpm.2025.062081