scholarly journals Spatial representation of fiber bridging forces in strain-hardening cement composites

2016 ◽  
Author(s):  
Jingu Kang ◽  
John Bolander
Keyword(s):  
Strain Hardening ◽  
Spatial Representation ◽  
Cement Composites ◽  
Fiber Bridging

scholarly journals Effects of Hybridized Synthetic Fibers on the Shear Properties of Cement Composites

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5055
Author(s):  
S.M. Iqbal S. Zainal ◽  
Farzad Hejazi ◽  
Farah N. A. Abd. Aziz ◽  
Mohd Saleh Jaafar
Keyword(s):  
Mechanical Properties ◽  
Synergistic Effects ◽  
Reinforced Concrete Structures ◽  
Cement Composites ◽  
Direct Shear ◽  
Hybrid Fiber ◽  
Conventional Concrete ◽  
Synthetic Fibers ◽  
Fiber Bridging ◽  
Shear Energy

The use of fibers in cementitious composites yields numerous benefits due to their fiber-bridging capabilities in resisting cracks. Therefore, this study aimed to improve the shear-resisting capabilities of conventional concrete through the hybridization of multiple synthetic fibers, specifically on reinforced concrete structures in seismic-prone regions. For this study, 16 hybrid fiber-reinforced concretes (HyFRC) were developed from the different combinations of Ferro macro-synthetic fibers with the Ultra-Net, Super-Net, Econo-Net, and Nylo-Mono microfibers. These hybrids were tested under direct shear, resulting in improved shear strength of controlled specimens by Ferro-Ultra (32%), Ferro-Super (24%), Ferro-Econo (44%), and Ferro-Nylo (24%). Shear energy was further assessed to comprehend the effectiveness of the fiber interactions according to the mechanical properties, dosage, bonding power, manufactured material, and form of fibers. Conclusively, all fiber combinations used in this study produced positive synergistic effects under direct shear at large crack deformations.

Properties of strain-hardening cement composites with superabsorbent polymer particles

2019 ◽  
Vol 71 (8) ◽  
pp. 437-448 ◽  
Author(s):  
Seok-Joon Jang ◽  
Hyun-Do Yun ◽  
Sun-Woo Kim ◽  
Wan-Shin Park ◽  
Koichi Kobayashi
Keyword(s):  
Strain Hardening ◽  
Cement Composites ◽  
Superabsorbent Polymer ◽  
Polymer Particles

Deformability enhancement of fiber-reinforced cementitious composite by incorporating recycled powder

2019 ◽  
Vol 39 (3-4) ◽  
pp. 119-131
Author(s):  
Jiangtao Yu ◽  
Fangming Jiang ◽  
Kequan Yu ◽  
Fangyuan Dong ◽  
Xinzhi Duan
Keyword(s):  
Fracture Toughness ◽  
Fly Ash ◽  
Strain Hardening ◽  
Tensile Strain ◽  
Tensile Load ◽  
Average Diameter ◽  
Silica Sand ◽  
Cementitious Composite ◽  
Strain Capacity ◽  
Fiber Bridging

Recycled powder (RP) from construction and demolish waste was used to replace fly ash and silica sand to enhance the tensile behavior of engineered cementitious composite (ECC) in the research. The average diameter of RP is less than 45 μm. Four mixtures of RP-ECCs were prepared, in which 50% and 100% of fly ash or silica sand were replaced by RP. The tensile strain-hardening and multiple cracking behaviors of RP-ECC specimens were extensively observed with the increasing tensile load. Results demonstrate that the replacement of fly ash and sand by RP promote the strain capacity of ECC specimens. Moreover, specimens with 50% RP showed superior tensile and compressive strength over those with 100% replacement ratio and the reference specimens. The analyses at micro-scale and meso-scale indicate that the replacement of fly ash by RP does not change the fracture toughness of the cementitious matrix, but significantly enhanced the fiber bridging capacity. While the replacement of sand by RP lowers the matrix fracture toughness and has a negligible effect on the fiber bridging capacity. Finally, the superior tensile strain capacity of RP-ECC is well-explained by the pseudo-strain hardening index.

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