A Laboratory Study on the Potentiodynamic Polarization and Transport Properties of Binary Concrete with Silica Fume and Zeolite

Document Type : Research Papers

Authors

1 Associate Professor, Department of Concrete Technology, Road, Housing and Urban Development Research Center (BHRC), Tehran, Iran.

2 Ph.D., Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, Iowa, USA.

3 Ph.D. Candidate, Department of Concrete Technology, Road, Housing and Urban Development Research Center (BHRC), Tehran, Iran.

Abstract

The current study aims to investigate influence of w/cm ratio, cementitious materials content and supplementary cementitious materials on the transport properties of concrete and chloride-induced corrosion rate of reinforcement. To do this, several mixes are designed with and without silica fume and natural zeolite as supplementary cementitious materials, w/cm of 0.4 and 0.5, and cementitious materials contents of 325 and 400 kg/m3. These mixes are subjected to evaluation of compressive strength, transport properties (i.e. absorption, water penetration depth and rapid chloride penetration test), and corrosion rate measurement through Potentiodynamic test and electrochemical measurements. The results of this study reveal that there is not strong correlation between corrosion rate of reinforcement and the measured strength and transport properties. The corrosion rate of reinforcement significantly decreased through reduction of water-to-cementitious materials ratio and use of supplementary cementitious materials; of which w/cm showed a more considerable influence. Increase in cement content, however, increased the transportation of water and chloride into the concrete and thus increased the corrosion rate of reinforcement.

Keywords


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Volume 55, Issue 1
June 2022
Pages 19-29
  • Receive Date: 16 June 2020
  • Revise Date: 07 June 2021
  • Accept Date: 12 June 2021
  • First Publish Date: 01 June 2022