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Sun Wei - One of the best experts on this subject based on the ideXlab platform.
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durability of concrete exposed to sulfate attack under flexural loading and drying wetting cycles
Construction and Building Materials, 2013Co-Authors: Jianming Gao, Luguang Song, Tingxiu Wang, Sun WeiAbstract:Abstract The Damage Process of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles are investigated in this paper. ESEM, MIP, and XRD were used to investigate the changing of microstructure and corrosion products of interior concrete. The results indicate that compared with the single Damage Process of sulfate attack, flexural loading and drying–wetting cycles can both accelerate the Damage Process of concrete subjected to sulfate attack. While compared with sulfate attack and drying–wetting cycles, the effect of flexural loading on the deterioration of concrete depends on the stress level. It was also found that the addition of admixtures can improve the ability of sulfate resistance of concrete when it is also subjected to mechanical loading and drying–wetting cycles.
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Durability of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles
Construction and Building Materials, 2013Co-Authors: Jianming Gao, Luguang Song, Tingxiu Wang, Sun WeiAbstract:Abstract The Damage Process of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles are investigated in this paper. ESEM, MIP, and XRD were used to investigate the changing of microstructure and corrosion products of interior concrete. The results indicate that compared with the single Damage Process of sulfate attack, flexural loading and drying–wetting cycles can both accelerate the Damage Process of concrete subjected to sulfate attack. While compared with sulfate attack and drying–wetting cycles, the effect of flexural loading on the deterioration of concrete depends on the stress level. It was also found that the addition of admixtures can improve the ability of sulfate resistance of concrete when it is also subjected to mechanical loading and drying–wetting cycles.
Jianming Gao - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the Damage Process of recycled aggregate concrete under sulfate attack and wetting drying cycles
Construction and Building Materials, 2017Co-Authors: Jianming Gao, Fei Chen, Daman ShenAbstract:Abstract The evaluation of the Damage Process of recycled aggregate concrete made with different recycled coarse aggregate (RCA) replacements (30%, 50%, 70% and 100%) exposed to sodium sulfate solution (50 g/l) under wetting-drying cycles is investigated in this paper. Fly ash and granulated blast-furnace slag modified recycled aggregate concrete were examined by comparison with plain recycled aggregate concrete. Mass change, relative dynamic modulus of elasticity and water-soluble SO 4 2− contents of the specimens were measured. XRD, ESEM and XCT were used to investigate the changing of corrosion products and microstructure of interior concrete. The results indicate that the incorporation of RCA shows an obvious impact on the resistance of concrete against sulfate attack under wetting-drying cycles. Additionally, the FA and GBFS modified recycled aggregate concretes exhibit better resistance than plain recycled aggregate concrete. The analysis of corrosion products from XRD and microstructure from XCT and ESEM is in accordance with the results of water-soluble SO 4 2− contents, mass change and E rd .
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durability of concrete exposed to sulfate attack under flexural loading and drying wetting cycles
Construction and Building Materials, 2013Co-Authors: Jianming Gao, Luguang Song, Tingxiu Wang, Sun WeiAbstract:Abstract The Damage Process of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles are investigated in this paper. ESEM, MIP, and XRD were used to investigate the changing of microstructure and corrosion products of interior concrete. The results indicate that compared with the single Damage Process of sulfate attack, flexural loading and drying–wetting cycles can both accelerate the Damage Process of concrete subjected to sulfate attack. While compared with sulfate attack and drying–wetting cycles, the effect of flexural loading on the deterioration of concrete depends on the stress level. It was also found that the addition of admixtures can improve the ability of sulfate resistance of concrete when it is also subjected to mechanical loading and drying–wetting cycles.
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Durability of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles
Construction and Building Materials, 2013Co-Authors: Jianming Gao, Luguang Song, Tingxiu Wang, Sun WeiAbstract:Abstract The Damage Process of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles are investigated in this paper. ESEM, MIP, and XRD were used to investigate the changing of microstructure and corrosion products of interior concrete. The results indicate that compared with the single Damage Process of sulfate attack, flexural loading and drying–wetting cycles can both accelerate the Damage Process of concrete subjected to sulfate attack. While compared with sulfate attack and drying–wetting cycles, the effect of flexural loading on the deterioration of concrete depends on the stress level. It was also found that the addition of admixtures can improve the ability of sulfate resistance of concrete when it is also subjected to mechanical loading and drying–wetting cycles.
K Takahashi - One of the best experts on this subject based on the ideXlab platform.
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Characterization of the Damage Process in short-fibre/thermoplastic composites by acoustic emission
Journal of Materials Science, 1998Co-Authors: N.s Choi, K TakahashiAbstract:Fracture Processes of short glass fibre-reinforced thermoplastic tensile specimens have been investigated in relation to acoustic emission (AE) characteristics. Two fibre diameters (d=10, 23 μm) were adopted for this study. Frequency analysis employing band-pass filters suggested that AE with higher amplitude was due to fibre breakages. Fibre–matrix interfacial failure and matrix fracture emitted lower amplitude AE waves. Reflected and transmitted optical microscopy, in combination with scanning electron microscopy, revealed that fibre breakage ahead of the artificial notch tip led to the initiation of a macroscopic fracture. This coincided with the results that AE peak amplitudes, Vp, showed a minimum at fracture initiation. When the macroscopic fracture propagated, Vp again increased rapidly, indicating additional fibre breakage. These fracture mechanism worked consistently for both d=10 and 23 μm. Based on the above findings, AE source characterization was proposed for the stable fracture Process of short fibre-reinforced plastics. © 1998 Chapman & Hall
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Characteristics of acoustic emission during the Damage Process in notched short-fibre-reinforced thermoplastics
NDT & E International, 1992Co-Authors: N.s Choi, K Takahashi, K. HoshinoAbstract:Abstract The effects of the notch tip radius on acoustic emission (AE) characteristics have been studied for short-glass-fibre reinforced poly(ethylene terephthalate) (SGFR-PET) tensile specimens. The adopted notch tip radii (ϱ) were nominally zero (0) and 2.3 mm. The larger ϱ caused an increase in the load corresponding to the beginning of AE and an increase in the maximum load and fracture displacement. AE peak amplitudes (V p ) showed ϱ dependence of the Damage formation and fracture mechanism of the composite. For ϱ = 0, V p increased drastically and then decreased with increases in load. However, for ϱ = 2.3 mm V p increased fairly monotonically. In a higher amplitude range, V p exhibited a minimum at the initiation of a main crack for both radii. Frequency analysis suggested that AE sources were not dependent on ϱ, and AE events for the higher V p corresponded to fibre breakages. Reflected and transmitted optical microscopy combined with ultrasonic C-scan revealed that fibre breakages ahead of the notch tip led to initiation of a main crack, which agreed with the results of V p above. When the main crack propagated, V p increased rapidly again for both radii, indicating additional fibre breakage. As a consequence, AE characteristics representing the Damage formation mechanism in short-fibre-reinforced thermoplastic were found to be considerably influenced by the notch tip radius.
N.s Choi - One of the best experts on this subject based on the ideXlab platform.
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Characterization of the Damage Process in short-fibre/thermoplastic composites by acoustic emission
Journal of Materials Science, 1998Co-Authors: N.s Choi, K TakahashiAbstract:Fracture Processes of short glass fibre-reinforced thermoplastic tensile specimens have been investigated in relation to acoustic emission (AE) characteristics. Two fibre diameters (d=10, 23 μm) were adopted for this study. Frequency analysis employing band-pass filters suggested that AE with higher amplitude was due to fibre breakages. Fibre–matrix interfacial failure and matrix fracture emitted lower amplitude AE waves. Reflected and transmitted optical microscopy, in combination with scanning electron microscopy, revealed that fibre breakage ahead of the artificial notch tip led to the initiation of a macroscopic fracture. This coincided with the results that AE peak amplitudes, Vp, showed a minimum at fracture initiation. When the macroscopic fracture propagated, Vp again increased rapidly, indicating additional fibre breakage. These fracture mechanism worked consistently for both d=10 and 23 μm. Based on the above findings, AE source characterization was proposed for the stable fracture Process of short fibre-reinforced plastics. © 1998 Chapman & Hall
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Characteristics of acoustic emission during the Damage Process in notched short-fibre-reinforced thermoplastics
NDT & E International, 1992Co-Authors: N.s Choi, K Takahashi, K. HoshinoAbstract:Abstract The effects of the notch tip radius on acoustic emission (AE) characteristics have been studied for short-glass-fibre reinforced poly(ethylene terephthalate) (SGFR-PET) tensile specimens. The adopted notch tip radii (ϱ) were nominally zero (0) and 2.3 mm. The larger ϱ caused an increase in the load corresponding to the beginning of AE and an increase in the maximum load and fracture displacement. AE peak amplitudes (V p ) showed ϱ dependence of the Damage formation and fracture mechanism of the composite. For ϱ = 0, V p increased drastically and then decreased with increases in load. However, for ϱ = 2.3 mm V p increased fairly monotonically. In a higher amplitude range, V p exhibited a minimum at the initiation of a main crack for both radii. Frequency analysis suggested that AE sources were not dependent on ϱ, and AE events for the higher V p corresponded to fibre breakages. Reflected and transmitted optical microscopy combined with ultrasonic C-scan revealed that fibre breakages ahead of the notch tip led to initiation of a main crack, which agreed with the results of V p above. When the main crack propagated, V p increased rapidly again for both radii, indicating additional fibre breakage. As a consequence, AE characteristics representing the Damage formation mechanism in short-fibre-reinforced thermoplastic were found to be considerably influenced by the notch tip radius.
Luguang Song - One of the best experts on this subject based on the ideXlab platform.
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durability of concrete exposed to sulfate attack under flexural loading and drying wetting cycles
Construction and Building Materials, 2013Co-Authors: Jianming Gao, Luguang Song, Tingxiu Wang, Sun WeiAbstract:Abstract The Damage Process of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles are investigated in this paper. ESEM, MIP, and XRD were used to investigate the changing of microstructure and corrosion products of interior concrete. The results indicate that compared with the single Damage Process of sulfate attack, flexural loading and drying–wetting cycles can both accelerate the Damage Process of concrete subjected to sulfate attack. While compared with sulfate attack and drying–wetting cycles, the effect of flexural loading on the deterioration of concrete depends on the stress level. It was also found that the addition of admixtures can improve the ability of sulfate resistance of concrete when it is also subjected to mechanical loading and drying–wetting cycles.
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Durability of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles
Construction and Building Materials, 2013Co-Authors: Jianming Gao, Luguang Song, Tingxiu Wang, Sun WeiAbstract:Abstract The Damage Process of concrete exposed to sulfate attack under flexural loading and drying–wetting cycles are investigated in this paper. ESEM, MIP, and XRD were used to investigate the changing of microstructure and corrosion products of interior concrete. The results indicate that compared with the single Damage Process of sulfate attack, flexural loading and drying–wetting cycles can both accelerate the Damage Process of concrete subjected to sulfate attack. While compared with sulfate attack and drying–wetting cycles, the effect of flexural loading on the deterioration of concrete depends on the stress level. It was also found that the addition of admixtures can improve the ability of sulfate resistance of concrete when it is also subjected to mechanical loading and drying–wetting cycles.
