Combined Utilization of Construction and Demolition Waste and Propylene Fiber in Cement-Stabilized Soil

Construction and demolition (C&D) waste has become a research hotspot due to the need for environmental sustainability strength enhancement of cementitious materials. However, wider applications C&D are limited, as its non-homogeneous surface nature limits workability. This evaluated feasible utilization aggregates in polypropylene-fiber-reinforced cement-stabilized soil (CSS) under sulfate-alkali activation. CSS specimens incorporated Portland cement 10%, 20%, 30% proportions. Also, polypropylene fiber after alkali activation by sodium sulfate (at 0.2%, 0.4%, 0.8% dosing level) was defined 1%, 2%, 4%. Strength examined through unconfined compressive (UCS) flexural tests at 7, 14 28 days. Test results indicated that mechanical properties showed significant improvement with increasing levels sulfate, while dropped excessive addition fiber. Optimal proportioning determined 30%, 4%, cement, fiber, waste, respectively. Scanning electron microscope (SEM) analysis attributed hydration product (ettringite) formation, bridging effect increased particle friction. Additionally, decrease amplification ascribed destruction interface transition-zone (ITZ) strength, resulting premature failure.