Electrical Resistivity and Half-Cell Potential Studies to assess organic and inorganic corrosion inhibitors’ effectiveness in concrete

¹ Professor of Civil Engineering, GRIET, Hyderabad, India.
² Executive Engineer, APDRP, Revenue Department (Disaster Management), Andhra Pradesh, India.
³ Professor of Civil Engineering, CVR College of Engineering Hyderabad, India.
⁴ Professor of Civil Engineering, VJIT, Hyderabad, India.

^* Corresponding author: vempada@gmail.com

Abstract

Very limited guidelines are available on the use of corrosion resistant inhibitors as a constituent material in concrete due to availability of statistics on its corrosion inhibiting efficiency. So the study is conducted on the M25 grade concrete mixed with few selected corrosion inhibitors of organic and non-organic nature to comprehend the impact of these corrosion inhibitors on the conductivity of electricity in these concretes. Based on the other researchers’ work, four well know corrosion inhibitors such as Calcium nitrate, Di-ethanolamine, Sodium nitrite and Hexamine and are chosen for study. Dosages of 1%, 2%, 3%, 4% and 5% the weight of cement are chosen. Measured electrical resistivity and half-cell potential values of all corrosion inhibitors admixed M25 grade concrete mixes indicates the superior corrosion inhibition ability of calcium nitrate and Di-ethanolamine’s with shows high electrical resistance.