Keywords
Reinforced concrete, corrosion current density, gravimetric weight loss method, linear polarization resistance method, durability-based design
DOI
10.5703/1288284316144
Conf _Paper_to_ICDCS_2016_China.docx (620 kB)
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Durability-Based Optimal Design Methodology for RC Members in Corrosive Environment
Comments
As durability-based design of reinforced concrete (RC) structures in corrosive environments is highly influenced by chloride-induced corrosion of reinforcing steel bars, this paper first presents brief outline of an experimental investigation recently carried out by the authors on a large number of reinforced concrete test specimens subjected to several scenarios of chloride-driven reinforcement corrosion. Concrete specimens were prepared with cementitious material content of 350, 375, and 400 kg/m3; water–cementitious ratios of 0.4, 0.45, and 0.5; fine to total aggregate ratios of 0.35, 0.4, and 0.45; and cover thickness of 25, 37.5, and 50 mm. The specimens were then exposed to chloride solution of three different concentrations and were tested for determining corrosionrate using electrochemical and gravimetric-weight loss methods. Numerical analysis of reinforcement-corrosion rates (determined electrochemically and gravimetrically) was first used to determine statistical correlation between corrosion rates obtained by the two methods. Then, the gravimetric reinforcement-corrosion rate results were utilized for developing regression models for reinforcement corrosion rates in terms of concrete quality parameters, concrete cover-thickness, and chloride concentration. The regression models obtained for reinforcement-corrosionrates were adapted within an automated analysis-design-methodology using Microsoft Excel solver for durabilitybased optimal design of RC members subjected to specified chloride exposure corrosive environments. Sample results obtained from the design methodology outlined in this paper are summarized for selected case studies of RC beams and columns.