Abstract
In order to achieve the whole process control of crack formation of engineered cementitious composites (ECC) under loading and improve the mechanical properties of ECC, PVA-steel hybrid fiber reinforced cementitious composites (HyFRCC) was proposed by mixing steel fibers with traditional ECC. And the key parameters to affect the HyFRCC performance are PVA fiber content, steel fiber content and aspect ratio of steel fiber. In order to investigate the mechanical properties of PVA-steel HyFRCC such as the compressive toughness, 15 PVA-steel HyFRCC specimens with different volume fraction of steel fiber and PVA fiber, together with 1 non-fibrous cementitious composites specimen and 3 ECC specimens with PVA fiber only for comparison were designed and uniaxial compression tests were conducted. Furthermore, the effect of fiber content, fiber type and fiber geometrical characteristic on the compressive toughness of HyFRCC were analyzed. The results show that PVA fiber content, steel fiber content and aspect ratio of steel fiber have little impact on the uniaxial compressive strength of the PVA-steel HyFRCC, while the peak strain, compressive toughness and the post-peak ductility of PVA-steel HyFRCC are improved significantly due to fiber hybridization. The formation of large scale cracks of ECC specimens after post-peak loading is restrained effectively with the addition of steel fiber. The mixture of PVA and steel fiber has a remarkable effect on the improvement of ECC compression toughness and crack control. It indicates that the energy dissipation and damage control capacity of the structural component with PVA-steel HyFRCC under seismic loading will be enhanced.
Highlights
The brittleness of ordinary concrete is an important factor that seriously restricts the workability and durability of concrete structures under complex loading conditions
In order to investigate the mechanical properties of PVAsteel hybrid fiber reinforced cementitious composites (HyFRCC) such as the compressive toughness and the key parameters to affect HyFRCC performance, 15 polyvinyl alcohol (PVA)-steel HyFRCC specimens with different volume fraction of steel fiber and PVA fiber, together with 1 non-fibrous cementitious composites specimen and 3 engineered cementitious composites (ECC) specimens with PVA fibers only were designed and uniaxial compression tests were conducted
Since the size of the steel fiber is much larger than the PVA fiber, the defect introduced by steel fibers is less than that introduced by PVA fibers with the same volume fraction
Summary
The brittleness of ordinary concrete is an important factor that seriously restricts the workability and durability of concrete structures under complex loading conditions. In order to investigate the mechanical properties of PVAsteel HyFRCC such as the compressive toughness and the key parameters to affect HyFRCC performance, 15 PVA-steel HyFRCC specimens with different volume fraction of steel fiber and PVA fiber, together with 1 non-fibrous cementitious composites specimen and 3 ECC specimens with PVA fibers only were designed and uniaxial compression tests were conducted. The effect of PVA fiber content, steel fiber content and aspect ratio of steel fiber on the mechanical properties of HyFRCC such as axial compressive strength, peak strain and compressive toughness were analyzed further. According to the recommendations for design and construction of ECC and the previous research results, the mix ratio of HyFRCC was designed All of these mixtures that investigated in this study had the same cement, fly ash, sand, and water.
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