2.3.1. Scheme Design

After curing, in order to investigate the influence of crack on corrosion behavior of rebar in concrete, an experimental procedure was determined and shown in Figure 2. Firstly, RC samples must be vacuum-saturated by vacuum water saturation instrument to guarantee they were well conductive. Secondly, electrochemical properties of rebar in concrete were tested by LP, TPP and EIS measurements. Subsequently, the accelerated chloride penetration experiment was conducted for 96 h so that chloride ions can rapidly penetrate into concrete along with the depth direction of crack and corrode the rebar. Then, the vacuum-saturated treatment will be conducted in a second time before testing electrochemical properties of rebar again. Finally, electrochemical test measurements were performed again to obtain electrochemical properties of rebar after the accelerated chloride penetration experiment. The rationality of electrochemical test procedure and test times will be discussed in the Section 2.3.4.

**Figure 2.** Experimental procedure.
