| Authors |
Yun Hyun-Do ; Yang Il-Seung ; Han Byung-Chan ; Kim Sun-Woo ; Jeon Esther ; Choi Chang-Sik |
| Keywords |
Hybrid Fiber ; High Performance Cement-Based Composites ; Steel Cord ; Synthetic Fiber ; Multiple Cracking |
| Abstract |
In this paper, workability, fiber dispersion, compressive strength, splitting strength, bending loading, direct tensile loading, and cyclic loading in both tension and compression of hybrid fiber reinforced cement composites(HFRCC) have been investigated by means of Korean Standard (KS). Hybrid fiber reinforced cement composites(HFRCC) contains both of specially processed steel fiber(steel cord) and synthetic fiber, such as Polyethylene(PE) and Polyvinyl Alcohol(PVA). Test results showed that the fibers, when used in a hybrid form, could result in superior composite performance compared to their individual fiber reinforced cement composites. Synthetic micro fibers, such as PE and PVA, are effective at imparting fiber dispersion and ductility to the steel fiber(five twisted steel fiber) reinforced cement composite. As the result of the bending tests, HFRCC specimen shows multiple cracking in the area subjected to the greatest bending tensile stress. Uniaxial tensile test confirms the range of tensile strain capacity from 0.5 to 1.5% when hybrid fiber is used. The cyclic loading test results identified a unique unloading and reloading response for this ductile composite. Cyclic loading in tension appears not to affect the tensile response of the material if the uniaxial compressive strength during loading is not exceeded. |