Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Fracture performance of concrete incorporating different levels of recycled coarse aggregate
This study investigated the fracture performance of concrete containing different levels of recycled coarse aggregate (RA; i.e., 0, 30, 70, and 100%) with equivalent compressive strength using three‐point bend tests. In total, 32 beams with different notch depths (i.e., 40, 50, and 60 mm) were fabricated to test the load–deflection (P–δ) curves and load‐cracking mouth opening displacement (P‐CMOD) curves. The effects of RA substitutions on fracture parameters were analyzed and the size effect on fracture energy was also discussed. The results demonstrated that with the incremental of RA, the static elastic modulus continuously decreased, while the splitting tensile strength, fracture energy, fracture toughness, and effective crack length remained mostly unchanged. In contrast, the critical cracking opening displacement (CMODC) and critical tip opening displacement increased first and then deceased with the increase of RA substitution, the maximums appeared at 70%. The characteristic length of recycled aggregate concrete (RAC) was entirely less than that of natural aggregate concrete, indicating that RAC presented greater brittleness. Furthermore, increasing cross‐sectional area of ligament gradually increased the fracture energy.
Fracture performance of concrete incorporating different levels of recycled coarse aggregate
This study investigated the fracture performance of concrete containing different levels of recycled coarse aggregate (RA; i.e., 0, 30, 70, and 100%) with equivalent compressive strength using three‐point bend tests. In total, 32 beams with different notch depths (i.e., 40, 50, and 60 mm) were fabricated to test the load–deflection (P–δ) curves and load‐cracking mouth opening displacement (P‐CMOD) curves. The effects of RA substitutions on fracture parameters were analyzed and the size effect on fracture energy was also discussed. The results demonstrated that with the incremental of RA, the static elastic modulus continuously decreased, while the splitting tensile strength, fracture energy, fracture toughness, and effective crack length remained mostly unchanged. In contrast, the critical cracking opening displacement (CMODC) and critical tip opening displacement increased first and then deceased with the increase of RA substitution, the maximums appeared at 70%. The characteristic length of recycled aggregate concrete (RAC) was entirely less than that of natural aggregate concrete, indicating that RAC presented greater brittleness. Furthermore, increasing cross‐sectional area of ligament gradually increased the fracture energy.
Fracture performance of concrete incorporating different levels of recycled coarse aggregate
Chen, Wei (Autor:in) / Yang, Haifeng (Autor:in)
Structural Concrete ; 22 ; E48-E57
01.01.2021
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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