The experimental investigation of concrete carbonation depth

Cheng Feng Chang, Jing-Wen Chen

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277 Citations (Scopus)

Abstract

Phenolphthalein indicator has traditionally been used to determine the depth of carbonation in concrete. This investigation uses the thermalgravimetric analysis (TGA) method, which tests the concentration distribution of Ca(OH)2 and CaCO3, while the X-ray diffraction analysis (XRDA) tests the intensity distribution of Ca(OH)2 and CaCO3. The Fourier transformation infrared spectroscopy (FTIR) test method detects the presence of C-O in concrete samples as a basis for determining the presence of CaCO3. Concrete specimens were prepared and subjected to accelerated carbonation under conditions of 23 °C temperature, 70% RH and 20% concentration of CO2. The test results of TGA and XRDA indicate that there exist a sharp carbonation front. Three zones of carbonation were identified according to the degree of carbonation and pH in the pore solutions. The TGA, XRDA and FTIR results showed the depth of carbonation front is twice of that determined from phenolphthalein indicator.

Original languageEnglish
Pages (from-to)1760-1767
Number of pages8
JournalCement and Concrete Research
Volume36
Issue number9
DOIs
Publication statusPublished - 2006 Sep 1

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Ceramics and Composites

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