A simplified approach for prediction of concrete resistivity: experimental study and mathematic model

Corrosion of reinforcing rebar is one of the major causes to the premature deterioration of RC structures. However, there are many factors affecting corrosion of reinforcing rebar. In terms of the nature of reinforcing bar corrosion, concrete resistivity is a durability parameter affecting corrosion of reinforcing bar. This study was carried out to conduct further experimental verification and investigation of corrosion risk of reinforcing rebar in concrete based on concrete resistivity. First, the influences of major factors including W/C ratio, chloride content, ambient temperature, and relative humidity on concrete resistivity were investigated. Second, a total of 290 experimental data on concrete resistivity from previous literature were collected. Some of the empirical models for predicting concrete resistivity were reviewed and compared. Finally, a simplified mathematical model for predicting concrete resistivity from major corrosion parameters was developed, such as cement type, cement content, W/C ratio, corrosion temperature, relative humidity, chloride content, and corrosion time. The uncertainty and probability characteristics of this models are also investigated.

Automated summary

The study conducted experimental verification and investigation on the corrosion risk of reinforcing rebar in concrete based on concrete resistivity, exploring the influences of major factors and developing a mathematical model for predicting concrete resistivity.