The Corrosion Inhibition Effect of Forsterite (Mg2SiO4) Mine Tailings for Steel Rebar in Reinforced Concrete


Sancak E., Coban O.

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, cilt.10, ss.5770-5786, 2015 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 10 Konu: 7
  • Basım Tarihi: 2015
  • Dergi Adı: INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
  • Sayfa Sayıları: ss.5770-5786

Özet

In this study, the usability of forsterite mine tailings (FOT) to provide steel reinforcing bar corrosion inhibition effect was assessed. To this end, C30 grade concrete specimens were produced with and without forsterite mine tailings. FOT were used with 5%, 10%, 20%, and 40% by volume in 150x150x150 mm cubic specimens, which then were subject to water curing for 28 days at 21 +/- 1 degrees C temperature. At the end of the curing, the specimens with FOT were tested under compression. It was seen the density and compressive strength of specimens with FOT were lower at different rates, depending on the amount of FOT. However, the specimens with 5%, 10%, and 20% FOT still exhibited higher compressive strengths than that of C30 grade concrete. The concrete mixes without and with 5%, 10%, and 20% FOT were poured into empty set50x100 mm molds with centrally embedded empty set10 mm flat steel reinforcing bars. The specimens were taken off the molds after 24 hours and subject to normal curing for 14 days. Then the specimens were placed into a 5% NaCl solution to enhance the corrosion in the reinforcing bars. Over the course of 17 weeks (approximately 120 days), the corrosion rate, Polarization resistance (Rp), Corrosion potential (E-(I= 0)), and Corrosion current (Icor) values of the specimens were measured on a weekly basis by means of the Linear Polarization method. The results showed that the corrosion rate of the specimens with 5% and 10% forsterite mine tailings decreased compared to the reference specimens without forsterite tailings.