We study the conductive heat transport through calcium silicate hydrate (C-S-H) and organically cross-linked C-S-H via experiments, micromechanical homogenization theory, and molecular...

2009年3月1日 · The present FTIR study of certain C–S–H gels revealed substantial changes in gel structure after exposure to a highly alkaline solution. The frequency of the main band appearing on the spectrum for the control C–S–H gel (N0) does not change when sodium is added, but the variation in its shape is a possible sign of the precipitation or ...

To understand the influences of composition and polymers on the reaction kinetics and phase formation, CSH gels with varying Ca/Si ratios and amounts of poly (acrylamide-co-acrylic acid) partial...

2017年3月1日 · Synthetic C-S-H samples prepared with bulk C/S ratios from 0.75 to 1.5 were analyzed by coupled TG/DSC/FTIR and in-situ XRD while heating, in order to correlate observed weight loss curves with the kinetics of evolved gases, and to investigate the transformations C-S-H → β-wollastonite → α-wollastonite. The temperature of the ...

2017年11月30日 · FTIR revealed the presence of rings within the structure of C- (A)-S-H. Low Ca/Si ratio promotes Al incorporation into C- (A)-S-H, while in case of high Ca/Si ratio aluminium is also incorporated into AFm.

2011年9月7日 · The results from BET, XRD, ATR–FTIR, and STXM measurements are consistent and suggest that C–S–H layer structures are significantly modified due to the presence of organic polymers, and that the chemical composition and structural differences among the organic polymers determine the extent of the changes in the C–S–H nanostructures as ...

2007年11月14日 · All the gels were characterized with Fourier transform IR spectroscopy (FTIR). The gels synthesized with this procedure were shown to precipitate together with a silica-rich gel. In addition, the pH level was found to play a determinant role in …

FT-IR spectra of C-S-H are shown in Fig. 3. The characteristic bands of C-S-H centered at ~940-970 cm 1 were assigned to Si -O stretching vibrations and those at 800-825 cm 1 to Si-O...

transform infrared spectroscopy (FTIR). Before the above-mentioned test, well-dried samples were ground into powders with an average particle size less than 75 μm. XRD X-ray diffraction (XRD) was used for the identification of different types of C-S-H and the carbonation products. XRD was performed by a Philips PW 1830 diffractometer

2025年3月16日 · 7.2.3 Chemical Bonding. The FTIR spectra for synthetic composites are shown in Fig. 7.3, and frequencies for characteristic bond vibrations are labeled in the spectra.The frequencies at 1658, 1659, and 1676 cm −1 are associated with the stretching vibrations of C = O moiety of CSH@PAA, CSH@PAAm, and CSH@P(AAm-co-AA), respectively, suggesting the presence of amide groups [54, 55].