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Early-hydration of beta-Ca2SiO4 followed by FTIR/ATR spectroscopy
In this work the early hydration stages in beta-Ca2SiO4 derived from rice hull ash was examined by Fourier Transform Infrared Attenuated Total Reflectance (FTIR/ATR) spectroscopy. This is a powerful technique to study the initial stages of cement hydration. The hydration of beta-Ca2SiO4 was studied at different water/cement ratios between 0.40 and 0.70. The hydration process was followed by monitoring the area of the peak in the region of 1000 cm-1 (beta-Ca2SiO4, Si-O-Si asymmetric stretching) and the band at 1645 cm-1 (water, HOH bending mode) as a function of time. The hydration can be divided into two stages. The first stage is related to the initial hydrolysis of cement and is chemically-controlled. The second step is limited by water diffusion into cement grains and is a diffusion-controlled process. This step is slower than the first step. In conclusion, the FTIR/ATR technique can be applied to study the earlier-hydration behavior of cements and is also a useful tool to investigate the mechanism and effectiveness of many accelerators and even help to design new ones.
Early-hydration of beta-Ca2SiO4 followed by FTIR/ATR spectroscopy
In this work the early hydration stages in beta-Ca2SiO4 derived from rice hull ash was examined by Fourier Transform Infrared Attenuated Total Reflectance (FTIR/ATR) spectroscopy. This is a powerful technique to study the initial stages of cement hydration. The hydration of beta-Ca2SiO4 was studied at different water/cement ratios between 0.40 and 0.70. The hydration process was followed by monitoring the area of the peak in the region of 1000 cm-1 (beta-Ca2SiO4, Si-O-Si asymmetric stretching) and the band at 1645 cm-1 (water, HOH bending mode) as a function of time. The hydration can be divided into two stages. The first stage is related to the initial hydrolysis of cement and is chemically-controlled. The second step is limited by water diffusion into cement grains and is a diffusion-controlled process. This step is slower than the first step. In conclusion, the FTIR/ATR technique can be applied to study the earlier-hydration behavior of cements and is also a useful tool to investigate the mechanism and effectiveness of many accelerators and even help to design new ones.
Early-hydration of beta-Ca2SiO4 followed by FTIR/ATR spectroscopy
Paiva, L.B. de (author) / Rodrigues, F.A. (author)
Journal of Materials Science ; 39 ; 5841-5843
2004
3 Seiten, 4 Bilder, 1 Tabelle, 13 Quellen
Article (Journal)
English
Early-hydration of b-Ca2SiO4 followed by FTIR/ATR spectroscopy
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