Ecological Strategies for the Stabilization of Sandy Soils on the Peruvian Coast: Use of Activated Cane Ash and Calcareous Residues

Abstract

The stabilization of sandy soil is a crucial challenge in coastal regions due to its low cohesion and high vulnerability to erosion. This study evaluated the use of activated sugarcane ash and calcareous residues, agricultural and industrial byproducts, to improve soil mechanical properties, particularly its bearing capacity and compactness. The objective was to determine how these additives affect the soil's maximum density and California Loading Rate (CBR) index. Proctor compaction tests and CBR tests were performed according to ASTM D1557 and D1883 standards. Natural soil samples were mixed with different proportions of ash (3–9%) and calcareous residues (2–4%). The results showed a significant improvement: the CBR index of the natural soil was 9%, while the mixture of 6% ash and 3% calcareous residue reached 60%—an increase of 550%. This increase is relevant, as CBR is a key indicator of soil bearing capacity for road infrastructure. Stabilization with these materials offers an economical, accessible, and sustainable solution for improving road infrastructure in coastal regions. This approach promotes a circular economy, reduces environmental impact, and enhances infrastructure resilience in the face of extreme weather events.