The Effect of Porosity and Curing Conditions on the Bands of the Infrared Spectroscopy in Blend Cement Pastes | ||||
| Egyptian Journal of Solids | ||||
| Article 7, Volume 34, Issue 1, 2011, Page 77-91 PDF (472.47 K) | ||||
| DOI: 10.21608/ejs.2011.148862 | ||||
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| Abstract | ||||
| FT-IR spectroscopy is employed to investigate the effect of the local porosity, i.e., water to cement (w/c) ratio, at two different curing times of 3 and 28 days on the bands spectra in the ordinary Portland cement pastes (OPC) in the spectral range 400 to 4000 cm-1. The study revealed the characteristic changes in the stretching and bending vibration modes of the SiO4 group (≈ 460 cm-1), the stretching vibration modes of the C-O and of C=O bonds (≈ 970 cm-1, and 1430 cm-1) (the strong absorption of the 2- 3 CO group in the lattice region), and finally, the stretching vibration of the water molecules (vibration of the OHgroup < br />of the Portland CH phase). The results have indicated that the critical conditions for the change accompanying these vibration modes during the hydration mechanism of the OPC samples occur at (w/c) ratio of 0.3, and 0.35 independently of the hydration time. | ||||
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