Experimental Data on Unconfined Compressive Strength of Cement-Treated Clayey Silt from Northwestern Iași, Romania

OverviewThis dataset contains experimental measurements of Unconfined Compressive Strength (UCS) for cement-treated clayey silt (clSi) collected from northwestern Iași, Romania. The data represents the results of a comprehensive laboratory testing program investigating the influence of cement content, curing period, and compaction rate on the mechanical properties of stabilized soil.Material CharacteristicsSoil PropertiesThe soil used in this study is identified as clayey SILT (clSi) according to EN ISO 14688 standards, with the following composition and properties:<b>Grain size distribution</b>: 64% silt, 27% clay, 9% sand<b>Atterberg limits</b>: Liquid Limit (LL) = 36%, Plastic Limit (PL) = 24%, Plasticity Index (PI) = 12%<b>Physical properties</b>: Bulk unit weight (γ_bulk) = 16.84 kN/m³, moisture content (w) of 20.24%<b>Void characteristics</b>: Void ratio (e) = 0.87, Porosity (n) = 38.9%, Degree of saturation (Sr) = 0.62<b>Compaction characteristics</b>: Optimum Moisture Content (OMC) = 14.9%, maximum dry unit weight (γ_d,max) = 15.37 kN/m³Cement PropertiesThe stabilization agent used was Portland Cement (PC) type CEM II/B-M(S-LL) 42.5 R conforming to the European standard EN 197-1. This composite cement is characterized by:<b>Composition</b>: 65–79% clinker, 6–20% granulated blast furnace slag (S), and 6–20% limestone (LL) by mass<b>Chemical composition</b>: 56.2% CaO, 19.8% SiO₂, 7.1% Al₂O₃, among other oxides<b>Strength class</b>: 42.5 MPa minimum compressive strength at 28 days<b>Early strength</b>: Rapid initial strength developmentExperimental MethodologyCylindrical specimens (3.8 cm diameter, 7.6 cm height) were prepared with varying cement contents (0%, 2.5%, 5%, 7.5%, and 10% by dry weight) and compacted at different rates (0.75, 1.0, and 1.25 mm/min) using static compaction. The specimens were prepared at the optimum moisture content of 14.9% and target dry unit weight of 15.37 kN/m³. The cement-treated samples were cured under controlled conditions (23°C) for periods of 1, 7, 14, and 28 days before UCS testing.Dataset ContentsThe dataset includes 185 UCS measurements with the following variables:Cement content (% by dry weight of soil)Curing period (days)Compaction rate (mm/min)Unconfined Compressive Strength (kPa)Research ApplicationsThis dataset supports research on:Soil stabilization techniques for infrastructure developmentPredictive modeling of cement-treated soil strength parametersOptimization of cement dosage for ground improvement projectsMachine learning applications in geotechnical engineeringTime-dependent behavior of stabilized soilsData FormatThe primary dataset is provided in CSV format.