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RISS 인기검색어
- 검색키워드
- 저자 : Shiping Yin (검색결과 3 건)
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Shiping Yin,Yuntao Hua,Yulin Yu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.6
In this study, the chloride ion diffusion and structural performance of beams reinforced with textile-reinforced concrete (TRC) were evaluated. The parameters investigated were chloride concentration, sustained load and number of textile layers. The results demonstrate that the content and diffusion coefficient of chloride increased with increasing chloride concentration. Higher chloride concentrations accelerated the crack propagation and deflection changes and caused the reduction of the load-carrying capacity of the beams. The sustained load promoted the chloride transport of the TRC, increasing the chloride ion content and diffusion coefficient and causing substantial damage to the microstructure of the TRC. In addition, the performance (such as cracking resistance, deflection and flexural capacity) of beams with a large sustained load ratio decreased to a less extent than did the performance of the unloaded beams. The content and diffusion coefficient of chloride in the unstrengthened beams were obviously larger than those in the strengthened beams, but increasing the textile layers number had little influence on these factors. In addition, for the unstrengthened beams, the cracks and deflections developed rapidly, and the load decreased greatly, especially the cracking load. Finally, in accordance with Fick’s second law of diffusion, a chloride diffusion equation in TRC layers under new boundary conditions was proposed.
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Bonding Behavior of TRC-Confined Concrete and Reinforcement under Chloride Erosion Environment
Lei Jing,Shiping Yin,Henglin Lv 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.3
The improved effect of the bonding behavior of concrete and reinforcement is a critical indicator for estimating the validity of strengthening measures. The bonding behavior of unconfined or textile reinforced concrete (TRC)-confined concrete and a plain or deformed reinforcement was comparatively analyzed via the pull-out tests, and the influence of chloride wet-dry cycles also was considered on the bonding behavior. Moreover, the bonding behavior was further revealed from the view of energy. The study results indicated that the bonding failure of specimens with a deformed reinforcement was changed after TRC confinement, showing a certain ductile failure characteristic, and the integrity of the confined specimens was ensured at failure. The impact of chloride attack on the bonding behavior of concrete and a plain or deformed reinforcement was different under the unconfined or TRC-confined condition. The deterioration mechanism of the bonding behavior needs to be further investigated when the reinforcement is corroded seriously. The results from the energy analysis are consistent with the pull-out test results.
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Shichang Li,Shiping Yin,Yu Gao 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.4
As a type of cement-based composite reinforcement material, textile reinforced concrete (TRC) has the advantages of corrosion resistance, high bearing capacity and good crack limit performance. Its bonding performance with the existing concrete interface is the key factor affecting the reinforcement effect. To study the interfacial adhesion between TRC and existing concrete, the sodium chloride concentration, the frequency and number of dry and wet cycles, the bonding length of the TRC reinforcement layer and the type of reinforcement were analysed by a double-sided shear test, XRD (X-ray diffraction) and SEM (scanning electron microscope) micro-test techniques. The influence of other factors on the interfacial bonding properties was further elaborated based on the theory of fracture energy. The results show that interface damage under chloride attack was mainly divided into three typical interface failure modes. By increasing the concentration of sodium chloride, reducing the frequency of dry and wet cycles and increasing the number of dry and wet cycles, the interface microstructure damage could be aggravated. Using cast-in-place reinforcement and increasing the bonding length could enhance the bonding performance of the interface.
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