Effect of Sand Addition on Laterite Soil Stabilization

• Published in: Materials 2024-12, Vol.17 (24), p.6033
• Main Authors: Almeida, Bárbara Drumond, Coelho, Lisley Madeira, Guimarães, Antônio Carlos Rodrigues, Monteiro, Sergio Neves
• Format: Article
• Language: English
• Subjects: Aluminum; Atterberg limits; Cement; Classification; Deformation analysis; Deformation effects; Durability; Flexible pavements; Highway construction; Laterites; Mechanical properties; Particle size; Pavement construction; Plastic deformation; Repeated loading; Roads & highways; Sand; Scanning electron microscopy; Shakedown analysis; Soil gradation; Soil investigations; Soil layers; Soil mechanics; Soil mixtures; Soil properties; Soil stabilization; Soil strength; Stabilization; Strain analysis; Triaxial tests; Tropical environments
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma17246033

Lateritic soils, particularly abundant in tropical regions, have been successfully used in the construction of unbound layers of flexible pavements in Brazil since the 1970s. Despite their potential, these soils are often discarded or only recommended after stabilization processes, based on traditional parameters such as gradation requirements and Atterberg limits. This study investigates the mechanical characteristics of a lateritic soil from Roraima, focusing on its resilient modulus and permanent deformation properties, assessed through repeated load triaxial tests. Specifically, this research examines the effect of adding 20% sand on the mechanical behavior of the material. The results indicate that sand addition did not significantly improve the mechanical performance. The laterite-sand mixture exhibited an average resilient modulus (RM) of 744 MPa, lower than the 790 MPa of pure lateritic soil, suggesting that pure laterite remains suitable for pavement applications. Furthermore, the permanent deformation analysis revealed that the mixture with sand experienced nearly twice the plastic strain compared to pure laterite, which demonstrated superior accommodation under repeated loading. In the shakedown analysis, pure laterite exhibited a more stable performance, indicating greater durability in pavement applications. These findings highlight the importance of understanding the mechanical behavior of lateritic soils beyond conventional testing methods, emphasizing the potential of pure laterite as a viable alternative to enhance the strength and durability of pavement structures.