A new probe, which does not use a confinement ring, has been developed to assess the corrosion state of reinforced concrete structures. Galvanostatic polarization is performed and the rebar corrosion potential, concrete resistivity and rebar corrosion rate are evaluated using an iterative calculation algorithm. The surface linear polarization resistance (R_P,s = ΔE_P/j_PI) of the rebar/concrete interface is calculated by converting the potential measured at the surface into the rebar polarization ΔE_P and the current density at the point of interest (PI) j_PI using 3D numerical simulations. The calculation involves three geometrical parameters that modify the current and potential distribution in the concrete: the rebar spacing, s; the concrete cover, c; and the rebar diameter, D. Concrete cover resistivity is calculated using the instantaneous ohmic drop measured at the beginning of the galvanostatic polarization and the rebar corrosion rate is calculated using the steady-state potential. As the rebar corrosion rate also modifies the potential distribution in concrete, an iterative methodology was developed, using different supposed corrosion rates. Finally, the probe and associated methodology were used to evaluate the corrosion state of eight concrete slabs. Half of them were prepared with chloride in order to initiate corrosion. Four slabs were stored outdoors, two indoors in an ordinary laboratory environment and two indoors in a 50% CO₂ gas chamber. The three corrosion parameters evaluated (corrosion potential, concrete cover resistivity and rebar corrosion rate) were in good agreement with the composition of the slabs and their curing conditions.

已经开发出一种不使用限制环的新型探针来评估钢筋混凝土结构的腐蚀状态。进行恒电流极化，并使用迭代计算算法评估钢筋的腐蚀电位，混凝土的电阻率和钢筋的腐蚀速率。线性极化电阻的表面（R _P，S  =ΔE _P / J _PI）钢筋/混凝土界面是通过在表面测量的电势转换成钢筋偏振ΔE计算_P和在感兴趣的点处的电流密度（PI ）.J _PI使用3D数值模拟。计算涉及三个可修改混凝土中电流和电势分布的几何参数：钢筋间距s；钢筋间距s；钢筋间距s。混凝土盖； c；混凝土盖层的电阻率是使用在恒电流极化开始时测得的瞬时欧姆降来计算的，而钢筋的腐蚀速率是使用稳态电势来计算的。由于钢筋腐蚀速率也改变了混凝土中的电位分布，因此开发了一种使用不同的假定腐蚀速率的迭代方法。最后，使用探针和相关的方法来评估八块混凝土板的腐蚀状态。其中一半用氯化物制备以引发腐蚀。四块平板存放在室外，_2个气室。评估的三个腐蚀参数（腐蚀电位，混凝土覆盖层电阻率和钢筋腐蚀速率）与板的成分及其固化条件非常吻合。