| Title |
Effects of PET Fiber Hybrid Conditions on Strain-Hardening Characteristics of Cement Composites |
| Authors |
Park Wan-Shin ; Yun Hyun-Do ; Jeon Esther |
| Keywords |
Strain-hardening Cement Composites(SHCC) ; Direct Tensile Stress ; Synthetic Fiber ; Ductility |
| Abstract |
The application of strain-hardening cement composites(SHCC) to structural systems depends primarily on the tensile response of the materials, which is a direct function of fiber and matrix characteristics, the fiber content or volume fraction, and the bond capacities between them. In general, improved response of material is observed with an increase in the fiber volume fraction, as long as the fiber content does not impede mixing. This paper discusses the result of the direct tensile response of cement composites reinforced with PET fibers. The main variables are included specimens with different types of fibers(PET, PET+PE, PET+PVA) and fiber volume fraction with 1.5%, 2.0%. Test results showed that the specimens with PET and PE fibers showed better overall behavior than those with only PET fibers. Moreover, their post-cracking strength was 3.9 times their first cracking strength, while for specimens with PET fibers, the post-cracking strength was only 102% higher than the cracking strength, especially, in series Ⅰ. For the same type of fiber, increase of the volume fraction leads to a marked improvement in the post-cracking strength, ductility, or energy absorption capacity of the composites. PET+PE reinforced specimens provided the best tensile strength (5.2MPa for vf=2.0%), while PET+PVA reinforced specimens provided the best ductility, e.g. they were able to maintain hardening response up to about 2% strain. |