| Title |
Effects of Fiber Hybrid Conditions on the Tensile Response Characteristics of High Performance Fiber-Reinforced Cement Composites(HPFRCCs) |
| Authors |
Yun Hyun-Do ; Kim Sun-Woo ; Jeon Esther |
| Keywords |
Hybrid Fiber ; High Performance ; Steel Cord ; Synthetic Fiber ; Tensile Response ; Fiber Combination Conditions |
| Abstract |
The effect of fiber types and fiber combination on the tensile response of cement paste matrix was experimentally investigated. The fibers used included polyvinyl alcohol(PVA), high-strength high-modulus polyethylene(PE), and polypropylene(PP), and they were randomly mixed in the matrix at volume fractions below 2.5%. Tensile properties of the composites were measured by the direct tensile test under both monotonic and cyclic loading. Various cyclic testing schemes were used to examine the effect of cyclic loading on the material's tensile stress-strain envelope. Testing results identified a unique unloading and reloading response for HPFRCC, which is a consequence of fibers debonding and pulling out of the matrix. The envelope curve is shown to govern cyclic response. HPFRCC can maintain its peak stress to large strains, producing a significantly different response than traditional cementitious materials. PE fiber with high strength and elastic modulus are found to be more effective than PVA and PP fibers in improving the strength, ductility and energy absorption capacity of cement-based composites. |