Flexural Behaviors of Ecological High Ductility Cementitious Composites Subjected to Interaction of Freeze-Thaw Cycles and Carbonation

抄録

To explore flexural behaviors of ecological high ductility cementitious composites (Eco-HDCC) for bridge deck link slab under severe service conditions, interaction experimental schemes of freeze-thaw cycles and carbonation were designed. Factors such as interaction cycle and preloading stress level were considered. Carbonation front and pore structure of Eco-HDCC were analyzed. The results show that ultimate flexural strength and ultimate deflection of Eco-HDCC decrease when interaction cycle or preloading stress level increases. Besides, all flexural load-deflection curves exhibit four stages: linear elastic, non-linear, deflection hardening and deflection softening stage. In addition, carbonation front of Eco-HDCC increases when interaction cycle or preloading stress level increases. With the same depth range in Eco-HDCC, pore structure deteriorates as interaction cycle increases, and deterioration degree of pores decreases as depth increases. For general consideration, after interaction cycles of 15, flexural property of Eco-HDCC with preloading stress level of 0.5 can be adopted for bridge deck link slab design with the aim to safety.