Effects of Different Cementing Agents on the Mechanical Behavior and Loading Rate Dependency of Cemented Granular Geomaterials (CGG)

Abstract

This research aims to assist the usage of high-plasticity soil in construction and road applications by investigating a novel method for creating granular geomaterials. The research aims to investigate the effects of several cementing agents, namely cement and gypsum, combined with polymer (Polyacrylic acid), on high-plastic soil in a composite state. The study examines the impact of several aging intervals (28 and 90 days) and three loading rates (0.1, 1, and 10 mm/min) on cemented granular geomaterials (CGG). The preparation of CGG entails the utilization of two different concentrations of cementing agents, specifically 5% and 10%, while ensuring a constant polymer content of 0.15% based on the wet weight of the soil. The experimental program focuses primarily on the analysis of Particle breakage strength, Shear strength parameters, X-ray diffraction (XRD), Scanning electron microscopy (SEM) and California bearing ratio. The study's findings reveal that the particles demonstrate significant strength, an increased friction angle, and an improved California bearing ratio. Significant improvements in strength values are particularly evident in cement-treated granular geomaterials (CTGG) after 90 days, however, no discernible changes are detected in gypsum-treated granular geomaterials (GTGG) over the same period. The study explores the treatment principle and physical attributes of CTGG, uncovering its lightweight nature, high porosity, and resemblance to traditional granular materials. The strength values obtained from the conducted experiments indicate that CGG has significant potential for use in applications like backfill, subgrade, or reclamation material. The research highlights the practicality of using soil with a high plasticity in building situations and offers useful knowledge on improving the properties of geomaterials through creative treatment techniques.