Strength Characteristics of Compacted Fly Ash Treated Expansive Soil due to Wetting-Drying Cycles Repetition

Due to high swelling-shrinkage caused by climate change, expansive soil is a significant problem in light construction, road embankments, and slope stability (wet dry). The physical mechanical properties of the are affected repeated drying wetting cycles, particularly changes volume, negative pore water pressure (suction), compressive strength. Fly ash used increase strength reduce plasticity swelling address this issue. Because its chemical properties, fly an excellent choice for low-cost improvement. purpose investigation determine static stabilization under Proctor standard compaction conditions. Mechanical were investigated due moisture content, saturation, suction, cycles. soil's suction was measured using Whatman #42 filter paper, tested free compression test. According findings, mixture altered expansion shrinkage behavior soils lowering consistency limit. At same addition 5% 15% increases significantly. Compressive (qu) stress-strain modulus (Ei) decreased 1-4 cycle after four very small or insignificant. proposed method effectively reduces loss environmental (wetting-drying). As result, it contributes significantly development materials structural damage soils.