en Structure-Concrete Structure- Concrete Research Paper Research Paper This paper aims at finding the long term coupled effect of high temperature and constant high relative humidity on the corrosion rehabilitated patches of chloride contaminated steel reinforced concrete. This paper is an extension of previous research in which the authors experimentally corroborated re-corrosion in the repaired reinforced concrete (RC) patches in the form of macro-cells. In previous research, the coupled effect was investigated by laboratory controlled experimentation at varying temperature of 30, 40 and 50°C and a high ambient relative humidity of 85% in environmental control chambers for duration of one year. The specimens were prepared having total chloride concentration in mixing water 3% and 5 % by mass of binder. In this present research paper, the two year results of the same specimens are presented to get a deep insight of the long term phenomenon of macro-cell corrosion under the coupled effect of high temperature and humidity on repaired RC patches. Macro-cell corrosion, Electrochemistry, High temperature, High relative humidity reinforced concrete, Long term experimentation 69 75 http://ijce.iust.ac.ir/browse.php?a_code=A-10-878-2&slc_lang=en&sid=1 Raja Rizwan Hussain rhussain@ksu.edu.sa 180031947532846009548 180031947532846009548 Yes Associate Professor, CoE-CRT, Civil Engineering Department, College of Engineering, King Saud University, Riyadh, 11421, Saudi Arabia M. Wasim 180031947532846009549 180031947532846009549 No College of Engineering, King Saud University, Riyadh, 11421, Saudi Arabia M. A. Baloch 180031947532846009550 180031947532846009550 No CEREM, Mechanical Engineering Department, King Saud University, Riyadh, 11421, Saudi Arabia