Effect of NaCl salinity on strength and stiffness of cement–fly ash–lime treated clayey soils
Unconfined compressive strength (UCS) and elastic modulus (E₅₀) are key parameters governing the load-bearing capacity and deformation behavior of stabilized soft soils. This study investigated the effect of NaCl salinity on clayey soil stabilized with a cement–fly ash–lime binder system. Two experimental schemes were conducted. In Scheme 1, cement and fly ash contents were fixed at 20% and 30% of dry soil weight, respectively, while lime content varied from 2% to 6%. In Scheme 2, NaCl contents of 1–4% were introduced into the corresponding mixtures. Specimens were cured under standard conditions and tested by unconfined compression after 7, 14, 28, and 56 days. The results were used to evaluate the influence of NaCl salinity on UCS and E₅₀, providing an experimental basis for mixture design and performance assessment of stabilized soft soils in saline environments.