Abstract
Studies monitoring the carbonation of NHL3.5 hydraulic lime are described. Weight-gain measurements, focused ion beam imaging, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy were used to monitor changes in structure and composition occurring in lime pastes after exposure to 100% carbon dioxide at relative humidities of 65 and 97%. Lime paste exposed to a relative humidity (R.H.) of 97% indicated a higher carbonation rate compared to paste exposed to 65% R.H. Surface analysis showed that the sample exposed to a relative humidity of 97% was completely carbonated. No calcium hydroxide was detected. A small amount of calcium hydroxide was, however, present at the surface of the sample exposed to 65% R.H. These observations suggest that high humidity results in the formation of a thin layer of crystalline calcium carbonate covering silicate and hydroxide phases. The actual mass increase of the sample also indicated that uncarbonated calcium hydroxide remained beneath the surface.
| Original language | English |
|---|---|
| Pages (from-to) | 1233-1240 |
| Number of pages | 8 |
| Journal | Cement and Concrete Research |
| Volume | 37 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2007 |
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El-Turki, A., Ball, R. J., & Allen, G. C. (2007). The influence of relative humidity on structural and chemical changes during carbonation of hydraulic lime. Cement and Concrete Research, 37(8), 1233-1240. https://doi.org/10.1016/j.cemconres.2007.05.002