Computers and Concrete

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A new approach for predicting sulfate ion concentration in concrete

  • Mohammad Ghanooni-Bagha (Department of Civil Engineering, East Tehran Branch, Islamic Azad University) ;
  • Mohsen Ali Shayanfar (The Centre of Excellence for Fundamental Studies in Structural Engineering, Iran University of Science and Technology) ;
  • Sajad Momen (Department of Civil Engineering, East Tehran Branch, Islamic Azad University)
  • Received : 2022.07.26
  • Accepted : 2023.01.06
  • Published : 2024.01.25
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Abstract

Aggressive environmental conditions, and especially the acidic effects of sulfate ion penetration, have reduced the lifetime of concrete structures in some areas, especially coastal and marine areas. In this research, at first, samples made of type II and V cement were kept in a solution of magnesium sulfate (MgSO4) for a period of 90 and 180 days, the change of appearance. Field Emission Scanning Electron Microscopy (FE-SEM) and X-Ray Diffraction (XRD), were used to analyze the microstructure and the complex mineral composition of the concrete after exposure to corrosive environments. Then solving the differential equation governing the sulfate ion penetration, which is based on the second Fick law, it has been tried to determine the concentration of sulfate ions inside the concrete. In the following, an attempt has been made to improve the prediction of sulfate ion concentration in concrete by using Crank's penetration equation. At the same time, the coefficient in the Crank's solution have been optimized by using the Particle Swarm Optimization (PSO algorithm). The comparison between the results shows that the values obtained from Crank's relation are closer to the experimental results than the equation obtained from Fick's second law and shows a more accurate prediction.

Keywords

Acknowledgement

The present study was financially supported by Committee for Scientific Research of Islamic Azad University, East Tehran Branch, Tehran, Iran (IAUET).

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