Chloride Diffusion Analysis of Concrete Members Considering Depth-Dependent Diffusion Coefficients and Effect of Reinforcement Presence

Chloride diffusion analysis of reinforced concrete beam enhanced with externally bonded fibre reinforced polymer considering the presence of rebars and stirrups

“…The beam models with or without rebars were respectively unenhanced, enhanced in the 5 th year, enhanced in the 10 th year and enhanced in the 15 th year. Clear differences were observed in chloride ion content among the beams, which agree well with the results in References [6,[9][10]. The chloride ion contents with or without rebars were compared and recorded in Table 2.…”

“…Chloride diffusion is blocked at the positions of the rebars. Similar to previous studies, the rebars were modelled as a cavity or a hole in concrete member with zero diffusion coefficient [6,[9][10].…”

“…Hansen [8] was the first to point out the effect after noting the higher chloride content on the front face of the rebar than that in unenhanced positions of the same depth. Wang and Li [9] conducted experiments and finite-element analysis on the impact of rebar presence on chloride diffusion; the results show that chloride tends to accumulate at the apex of rebar, and that chloride content escalated more quickly with the increase of rebar diameter. Oh and Jang [10] found that the corrosion initiation time dropped by 30~40% after the addition of rebar, an evidence to the chloride accumulation at the apex of rebar.…”

Prediction model of chloride diffusion in concrete considering the coupling effects of coarse aggregate and steel reinforcement exposed to marine tidal environment

“…Kranc and Sagues [14] pointed out that the blocking effect of rebar can enhance the chloride concentrations at the apex of steel reinforcement by numerical analysis, and they proposed the attenuation coefficient for chloride concentration due to the steel bar existence to explore the earlier initiation time of steel corrosion. Oh and Jang [15] used the FEM to estimate the chloride transport behaviors in reinforced concrete. They concluded that the larger diameter of rebar can result in greater accumulation of chloride concentrations at the apex of steel bar, as well as the initiation time of steel corrosion can shorten about 30-40% due to the reinforcement existence.…”

“…Despite of all these laudable achievements during the previous investigations, however, the existing researches related to the effects of the coarse aggregate and steel reinforcement on chloride diffusion either considered the coarse aggregate volume fraction (or coarse aggregate content) only [5][6][7][8][9][10][11][12]17], or taken into account the blocking effect of steel bar separately [13][14][15][16]. The coupling effects of coarse aggregate and steel reinforcement on chloride diffusion in concrete required to be deeply researched and explored.…”