To obtain a promising mixture of an Eco-HDCC (Ecological High-Ductility Cementitious Composites) modified with RAC (Recycled Asphalt Concrete) to cast bridge deck link slabs, the fracture behaviour of Eco-HDCCs with different levels of RAC replacement is examined. The CMOD (Crack Mouth Opening Displacement) as well as the deflection of Eco-HDCC are monitored, and two classical fracture mechanics models are compared. Results indicate that cracks in Eco-HDCC specimens are kinked, and RAC replacement level has little effect on the crack pattern. In addition, as the RAC replacement level increases, the peak load and second peak load of Eco-HDCC decrease, while the peak CMOD (or deflection) and second peak CMOD (or deflection) show the opposite trend. Moreover, to analyze the CMOD energy dissipation of Eco-HDCC, the curve area method seems to be better than the MTPM (Modified Two-Parameter Model) and the J-integral method. Larger RAC replacement level is helpful for the CMOD (or deflection) energy dissipation of Eco-HDCC. CMOD hardening energy is a dominant factor in the overall energy dissipation, and it increases with increasing RAC replacement level. Finally, the RAC replacement level of 100% is a promising choice to cast the bridge deck link slabs economically.
|Titolo:||Fracture mechanics-based mixture optimization of ecological high-ductility cementitious composites modified with recycled asphalt concrete|
|Data di pubblicazione:||2020|
|Appare nelle tipologie:||1.1 Articolo in rivista|