scholarly journals Development of Simulation Model of Chloride Ion Transportation in Cracked Concrete

2005 ◽  
Vol 3 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Ema Kato ◽  
Yoshitaka Kato ◽  
Taketo Uomoto
Keyword(s):  
Simulation Model ◽  
Chloride Ion ◽  
Cracked Concrete ◽  
Ion Transportation

scholarly journals Experimental and Simulation Study on Diffusion Behavior of Chloride Ion in Cracking Concrete and Reinforcement Corrosion

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Yongchun Cheng ◽  
Yuwei Zhang ◽  
Chunli Wu ◽  
Yubo Jiao
Keyword(s):  
Finite Element ◽  
Prediction Models ◽  
Chloride Concentration ◽  
Chloride Ion ◽  
Corrosion Current ◽  
Chloride Diffusion ◽  
Finite Element Models ◽  
Rc Structures ◽  
Cracked Concrete ◽  
Chloride Migration

A chloride ion is a key factor affecting durability of reinforced concrete (RC) structures. In order to investigate chloride migration in cracked concrete, considering the mesoscopic heterogeneity of concrete, concrete modeled here is treated as a four-phase composite consisting aggregate, mortar, crack, and interfacial transition zone (ITZ). In this paper, two-dimensional finite element models of cracked concrete with different crack widths and crack quantity are established and the control parameters are determined based on the nonsteady-state chloride migration (NSSCM) test. In addition, based on the concrete finite element models, influences of crack width, crack quantity, and erosion time on chloride migration behaviors and characteristics are studied. Furthermore, a prediction model of chloride concentration on the simulated surface of a rebar in concrete influenced by different crack states is established. This model is used to derive the corrosion current density and corrosion depth prediction models of a rebar in this paper, which can be used by engineers to estimate the migration behaviors of chloride and rebar corrosion degree in RC structures in a short time and evaluate the duration of RC structures after knowing the status of cracks and chloride diffusion sources.

scholarly journals Chloride ion Erosion of Cracked Concrete under Load

2019 ◽  
Vol 371 ◽  
pp. 032034
Author(s):  
Yunguo Zhang ◽  
Yue Han ◽  
Junjun Zhang
Keyword(s):  
Chloride Ion ◽  
Cracked Concrete ◽  
Ion Erosion

scholarly journals Applicability of Diffuse Ultrasound to Evaluation of the Water Permeability and Chloride Ion Penetrability of Cracked Concrete

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4156 ◽  
Author(s):  
Eunjong Ahn ◽  
Seongwoo Gwon ◽  
Hyunjun Kim ◽  
Chanyoung Kim ◽  
Sung-Han Sim ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Water Flow ◽  
Flow Rate ◽  
Water Permeability ◽  
Water Flow Rate ◽  
Chloride Ion ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Cracked Concrete ◽  
Diffuse Ultrasound

This study aims to explore the applicability of diffuse ultrasound to the evaluation of water permeability and chloride ion penetrability of cracked concrete. Lab-scale experiments were conducted on disk-shaped concrete specimens, each having a different width of a penetrating crack that was generated by splitting tension along the centerline. The average crack width of each specimen was determined using an image binarization technique. The diffuse ultrasound test employed signals in the frequency range of 200 to 440 kHz. The water flow rate was measured using a constant water-head permeability method, and the chloride diffusion coefficient was determined using a modified steady-state migration method. Then, the effects of crack width on the diffusion characteristics of ultrasound (i.e., diffusivity, dissipation), water flow rate, and chloride diffusion coefficient are investigated. The correlations between the water flow rate and diffuse ultrasound parameters, and between the chloride diffusion coefficient and diffuse ultrasound parameters, are examined. The results suggest that diffuse ultrasound is a promising method for assessing the water permeability and chloride ion penetrability of cracked concrete.

Dynamics of Dangling Bonds of Water Molecules in pharaonis Halorhodopsin during Chloride Ion Transportation

2012 ◽  
Vol 3 (20) ◽  
pp. 2964-2969 ◽  
Author(s):  
Yuji Furutani ◽  
Kuniyo Fujiwara ◽  
Tetsunari Kimura ◽  
Takashi Kikukawa ◽  
Makoto Demura ◽  
...  
Keyword(s):  
Chloride Ion ◽  
Water Molecules ◽  
Dangling Bonds ◽  
Ion Transportation

Electrochemical feature for chloride ion transportation in fly ash blended cementitious materials

2018 ◽  
Vol 161 ◽  
pp. 577-586 ◽  
Author(s):  
Biqin Dong ◽  
Zhentao Gu ◽  
Qiwen Qiu ◽  
Yuqing Liu ◽  
Weijian Ding ◽  
...  
Keyword(s):  
Fly Ash ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Ion Transportation

scholarly journals Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6663
Author(s):  
Sulei Zhang ◽  
Qing Xu ◽  
Rui Ren ◽  
Jiahao Sui ◽  
Chang Liu ◽  
...  
Keyword(s):  
Service Life ◽  
Numerical Simulations ◽  
Chloride Transport ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Service Performance ◽  
Concrete Lining ◽  
Cracked Concrete ◽  
Transport Behaviour ◽  
Subway Tunnels

The concrete lining in subway tunnels often undergoes cracking damage in coastal cities. The combination of cracked tunnel lining structures and high concentrations of corrosive ions in the groundwater (e.g., chlorine) can accelerate concrete erosion, reduce the mechanical performance of the lining structures and shorten the tunnel service life. This paper investigates the chloride ion concentration in the groundwater of several subway tunnels in the coastal city of Qingdao, China. Indoor experiments and numerical simulations are conducted to investigate the chloride ion transport behaviour and service performance of cracked concrete linings. The results are applied to predict the service life of lining structures. The crack depth in concrete linings is found to have the most significant effect on the transport rate of chloride ions, followed by the crack width. The numerical simulations are carried out using COMSOL software to study the chloride transport behaviour in cracked specimens and predict the service lifetimes of lining structures of different thicknesses, and the results correspond well with the experimental data. The durability of a concrete lining can be enhanced by increasing the thickness of the protective concrete layer. Additional measures are proposed for treating cracked concrete linings to resist chloride ion attack in subway tunnels.

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