The change of physical properties of calcium carbonate nanomaterials cured soil in road substrates

• Published in: Materials express 2024-06, Vol.14 (6), p.884-891
• Main Authors: Guo, Guoying, Li, Xin, Guo, Wenjun, Yang, Ling, Wang, Wei
• Format: Article
• Language: English
• Subjects: Calcium carbonate; Compressive strength; Curing; Curing agents; Doping; Internal friction; Linear phase; Mechanical properties; Nanomaterials; Physical properties; Road beds; Roads; Shear stress; Soil mechanics; Soil properties; Soil settlement; Soil strength; Soils; Stress-strain curves; Subgrades; Substrates; Tensile stress
• ISSN: 2158-5849; 2158-5857
• DOI: 10.1166/mex.2024.2668

The utilization of appropriate materials to enhance road subgrade’s physical characteristics is crucial for current transportation construction and maintenance. This study proposes a curing method that employs calcium carbonate nanomaterials to address the problem of soil displacement and settlement in roadway subgrades. A method was developed during the study to explore the optimal curing material ratio. Additionally, this study developed a method for testing and analyzing the mechanical properties of soils cured with nanomaterials, including measures of tensile stress, triaxial shear stress, and Moore’s damage envelope. The study demonstrated that the unconfined compressive strength of the soil treated with calcium carbonate nanomaterials was 0.40 MPa after 7 days of curing with a 6% doping of the curing agent. Increasing the doping to 18% resulted in a breaking load of the soil reaching 0.100 kN. Furthermore, the triaxial shear stress–strain curve of the soil exhibited a slope of 264.47 during the linear phase when the curing agent was dosed at 6%. The slope of the linear phase of the stress–strain curve for triaxial shear at 6% curing agent doping was found to be 264.47. The cured soil molar pack line exhibited an internal friction angle of 22.66 degrees at the same curing agent dosage. The displacement analysis of the replacement roadbed with cured soil revealed a maximum observed displacement of only 377 mm after filling the embankment using the study method. The experimental results provide support for the hypothesis of the study, which suggests that the application of calcium carbonate nanoparticles can significantly enhance the physical characteristics of road subgrade.