Stabilization of Clay Soils for Andean Roads Using Microsilica: Evaluation of Mechanical Performance

Gutarra Serpa W.H.; Flores Lorenzo A.R.; Flores Aquino K.S.; Aliaga Contreras A.J. · SSRG International Journal of Civil Engineering (2026) · DOI: 10.14445/23488352/ijce-v13i6p113

Resumen

Soil types are very important for the foundations of civil engineering projects. They are used a lot in highways, buildings, bridges, and dams, and they make sure that the whole infrastructure stays stable for its whole life. The current study examines the stabilization of clayey soils for the Andean roads (Qhapaq Ñan) situated in the Huancan district, Huancayo province, within the department of Junín, through the incorporation of microsilica in varying dosages. This study investigates the impact of incorporating 2%, 4%, 6%, and 8% Microsilica (MS) on the physical and mechanical properties of clay soil, utilizing tests in accordance with ASTM and AASHTO standards, including Atterberg Limits, Modified Proctor, California Bearing Ratio (CBR), and Unconfined Compressive Strength (UCS). The results show that the soil's liquid limit tends to go up to a dose of 4% MS, which is because it can hold more moisture; this obeys the retention capacity of humidity. The soil's mechanical property values also improved, especially when 6% MS was added. The results were 22.01% for CBR and 7.03 kg/cm² for unconfined compressive strength, which are good values for road subgrade. It is concluded that the incorporation of microsilica stabilizes clayey soil for Andean roads, increasing the strength and compaction of the subgrade and providing indicators of gradual soil improvement using up to a 6% MS dose; however, this dosage should be limited to no more than 6% MS due to secondary effects such as internal particle dryness and lack of homogeneity in the mix.

Instituciones: Universidad Continental