Experimental Study on the Effect of Stray Currents on the Mechanical Properties of Concrete with Different Cementitious Systems and Rebar Corrosion

Abstract

Abstract In order to study the effect of stray current on the compressive strengths of concrete and rebar corrosion under different cementitious systems, a set of test device is designed to simulate the migration of stray current in the concrete. The compressive strength of the concrete is tested in the 4th week and 7th week after electrification to evaluate the compressive strength ratio of the concrete with different cementitious materials under the influence of stray current. The polarization curve of the rebar is measured to evaluate the electrochemical properties of the rebar. The result shows that: The influence laws of stray currents on the strength of concrete with different cementitious materials and rebar corrosion are consistent. The reduction extent of the compressive strength of concrete and corrosion extent of rabars follows the sequence: pure cement > fly ash+mineral powder+fiber>fly ash ≥ fly ash+mineral powder+swelling agent≥fly ash+mineral powder.With the increase of current time, The longer the current time is, the more significant the reduction of compressive strength is, and the more serious the rebar corrosion is.