RT Journal Article
T1 Improvement of expansive soils: a review focused on applying innovative and sustainable techniques in the Ecuadorian coastal soils
A1 Macías-Párraga, Mariela
A1 Torrijo Echarri, Francisco Javier
A1 Alonso Pandavenes, Olegario
A1 Garzón Roca, Julio
AB Traditional stabilization techniques, such as lime and cement, widely used for their effectiveness, albeit with economic and environmental limitations, are leading to the search for sustainable approaches that utilize agricultural and industrial waste, such as rice husk ash, bagasse, and natural fibers. These have been shown to improve key geotechnical properties, even under saturated conditions, significantly. In particular, the combination of rice husk ash and recycled ceramics has shown notable results in Ecuadorian coastal soils. The article emphasizes the importance of selecting techniques that balance effectiveness, cost, and sustainability and identifies existing limitations, such as the lack of long-term data (ten years) and predictive models adapted to the Ecuadorian climate. From a bibliographic perspective, this article analyzes the challenges posed by expansive soils in the western coastal region of Ecuador, whose high plasticity and instability to moisture negatively affect civil works such as roads and buildings. The Ecuadorian clay contained 30% kaolinite and only 1.73% CaO, limiting its chemical reactivity compared to soils such as Saudi Arabia, which contained 34.7% montmorillonite and 9.31% CaO. Natural fibers such as jute, with 85% cellulose, improved the soil’s mechanical strength, increasing the UCS by up to 130%. Rice husk ash (97.69% SiO2) and sugarcane bagasse improved the CBR by 90%, highlighting their potential as sustainable stabilizers. All of this is contextualized within Ecuador’s geoenvironmental conditions, which are influenced by climatic phenomena such as El Niño and La Niña, as well as global warming. Finally, it is proposed to promote multidisciplinary research that fosters more efficient and environmentally responsible solutions for stabilizing expansive soils.
PB MDPI
YR 2025
FD 2025-07-23
LK https://hdl.handle.net/20.500.14352/124324
UL https://hdl.handle.net/20.500.14352/124324
LA eng
NO Macías-Párraga, M., Echarri, F. J. T., Alonso-Pandavenes, O., & Garzón-Roca, J. (2025). Improvement of expansive soils: A review focused on applying innovative and sustainable techniques in the ecuadorian coastal soils. Applied Sciences, 15(15), 8184. https://doi.org/10.3390/app15158184
DS Docta Complutense
RD 27 feb 2026