Chemical and Mechanical Soil Stabilization Techniques for Foundations

Abstract

Introduction: The geotechnical study is crucial for foundation design and herein the feasibility of stabilizing soil from Quillollaco Formation in Loja, Ecuador with quicklime. Methodology: Laboratory tests followed ASTM standards. Unaltered soil samples were extracted at depths ranging from 2,00 to 3.00 m and fed quicklime at varying percentages (13,00 to 21,00% and 3,00% for quicklime) during curing periods of 7 to 28 days. Before obtaining results, the soil was classified by primary classification. Laboratory tests included Atterberg limits, Standard Proctor, unconfined compressive strength and permeability. Results: Consequently, the results indicated that the soil is primarily clay with low plasticity. Although the addition of quicklime increases plasticity and compressive strength, the improvement is minimal and varies with dosage and cure time. Greater compaction and workability are observed with lower quicklime contents. Regarding permeability, moderate to high improvement is recorded with quicklime addition, suggesting enhanced drainage capacity. Disscusion: Stabilization of quicklime soil may improve some geomechanical properties, but its effectiveness and profitability could be limited, especially in clay soils of low plasticity. Emphasis is placed on the need to consider soil stabilization alternatives that are efficient and sustainable from economic and environmental points of view.