| Title |
Effect of Reinforcing Fiber Types on the Behavior Characteristics of SHCCs |
| Authors |
Yun Hyun-Do ; Kim Yong-Cheol ; Kim Sun-Woo |
| Keywords |
SHCC ; Reinforcing Fibers ; Water-cement Ratio ; Fiber Reinforcing Index ; Fiber Strain Factor ; Hybrid Fibers |
| Abstract |
Fiber is an important ingredient in strain-hardening cementitious composite (SHCC), which can control fracture of cementitious composite by bridging action. The properties of reinforcing fiber, as tensile strength, aspect ratio and elastic modulus, have great effect on the fracture behavior of SHCC. Therefore, a variety of experiments have being performed to access the performance of SHCC recently. The research emphasis is on the mechanical properties of SHCC made in Polyvinyl alcohol (PVA), Polyethylene (PE) fibers and steel cord (SC), and how this affects the composite property, and ultimately its strain-hardening performance. Also, effect of hybrid type and water-cement ratio on the behavior of SHCC was evaluated in this paper. For these purposes, compressive, four-point bending, and direct tensile tests on SHCC are carried out. As the results of the test, SHCC with water-cement ratio of 0.40 exhibited higher compressive strength, and lower flexural and tensile performance. When water-cement ratio is 0.45, SHCC with only synthetic fibers showed about 2% higher tensile strain. To improve performance of SHCC structural member, however, fiber reinforcing index and fiber strain factor must be improved. Therefore, it is thought that development of hybrid fiber system was needed for workability and economy. |