Study on the effect of ion invasion on compressive strength, resistivity and polarizability of concrete

Abstract

The structural safety of concrete has been attached great importance, especially in saline-alkali area. In order to better study the changes of physical parameters of concrete after corrosion in saline-alkali area, the soil quality in saline-alkali area was investigated and sampled to analyze the main ionic components of concrete corrosion environment. According to the corrosion ionic components, the concrete model was made by mixing carbonate and sulfate solutions with different concentrations. Resistivity method and induced polarization method were used to measure the resistivity and polarizability characterization of the model within the curing period (28d), and the compressive strength of the concrete model during the curing period was tested to study the correlation between the resistivity, polarizability and compressive strength of the concrete model. The results show that the resistivity, polarizability and compressive strength of concrete are closely related to the type and concentration of ions. There is a corresponding relationship between the polarizability and the bearing capacity of concrete test blocks mixed with the same solution. The larger the polarizability, the weaker the bearing capacity. There is no strong correlation between resistivity and bearing capacity. Polarizability data can reflect both ion invasion and strength change of concrete.