Detailed in situ ATR-FTIR spectroscopy study of the early stages of C-S-H formation during hydration of monoclinic C3S

Higl, J.; Hinder, D.; Rathgeber, Christoph; Ramming, B.; Lindén, Mika

doi:10.1016/j.cemconres.2021.106367

Cited by 80 publications

(42 citation statements)

References 22 publications

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“…Most samples showed a sharp drop of the water signal after 3 to 6 h, as shown in Figure 3. A similar drop was observed by Higl et al for reacting tricalcium silicate and attributed to the acceleration stage of the reaction 28 . Nevertheless, an accelerated C-S-H formation or calcium hydroxide consumption was not observed in in-situ XRD for our samples.…”

Section: Resultssupporting

confidence: 85%

“…A reduction of the calcium content < 1.0 is known to enhance the length of the silicate units since the calcium ions can be completely coordinated in the interlayers with no need for depolymerisation Both dimeric and oligomeric (pentamers, octamers and higher polymerized silicate with Q 2 units) silicate species are characterised by a main peak between 940 -970 cm -1 in overlapping vicinity. In literature, the two signals in that range were not discriminated and assigned to oligomeric silicate species 16,28 . The in-situ development, nevertheless, clearly shows the formation of two different peaks at very close positions.…”

Section: Accepted Articlementioning

confidence: 95%

“…A different set of methods is hence required to capture the structural formation. As originally published by Ylmén et al 2014 and recently confirmed by Higl et al, infrared spectroscopy is a valuable tool to follow cement or tricalcium silicate hydration in-situ [27][28][29] . The evaluation of the obtained spectra is not trivial since tricalcium silicate bands decrease in the same range where C-S-H bands develop.…”

Section: Accepted Articlementioning

confidence: 99%

“…In the hydrate with C/S = 0.8, this band decreased again while a band at 836 cm -1 was formed. The 809 cm -1 band was hence assigned to dimeric silicates according to literature, and the 836 cm -1 band to oligomeric silicate species 16,28,37 . A separate C-S-H band at 836 cm -1 was not reported to literature yet.…”

Section: Accepted Articlementioning

confidence: 99%

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Calcium silicate hydrate—in‐situdevelopment of the silicate structure followed by infrared spectroscopy

John

Stephan

2021

J Am Ceram Soc.

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In the current study, the development of the silicate structure of synthetic calcium silicate hydrates with different calcium contents were followed by in-situ infrared (IR) spectroscopy and correlated to the in-situ phase development evaluated by X-ray diffraction (XRD). A baseline correction method initially developed for X-ray diffractograms was successfully adapted for the complex background of the fingerprint region in in-situ IR, which significantly contributed to signal quality and reproducibility. The development of separate silicate infrared bands could be monitored over 24 h of reaction. These bands could be assigned to oligomeric and dimeric species based on their time and stoichiometry dependent development. It was clearly shown that the main peak of the dimeric silicate species was overlooked in the literature. The correlation of time-dependent events to in-situ XRD revealed that changes in the unit cell of calcium silicate hydrate are related to silicate polymerisation.

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Section: Resultssupporting

confidence: 85%

Section: Accepted Articlementioning

confidence: 95%

Section: Accepted Articlementioning

confidence: 99%

Section: Accepted Articlementioning

confidence: 99%

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Calcium silicate hydrate—in‐situdevelopment of the silicate structure followed by infrared spectroscopy

John

Stephan

2021

J Am Ceram Soc.

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“…Especially, a strong absorption band exhibited between 1000-800 cm −1 with a peak value at about 872 cm −1 revealed that the cement powder contains the C2S phase calcium silicate. The peak at 520 cm -1 assigned for bending vibration of O-Si-O bonds within the tetrahedral SiO4 groups present in the cement sample [59].…”

Section: Phytochemical Screening and Ftir Analysismentioning

confidence: 98%

Study on the effects of green-based plant extracts and water-proofers as anti-corrosion agents for steel-reinforced concrete slabs

et al. 2021

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Widespread applications of reinforced concrete structures have been practiced since the 20th century because of their excellent properties despite their early corrosion degradation. For the control of such a problem, a design strategy of corrosion-resistant environments of the reinforced concrete structures is highly desirable for extending of a lifetime. The present research work was focused to investigate the effects of the green plant extract-based inhibitors from Vitex negundo and Catharanthus roseus leaves, and one waterproofing chemical (PtS) for controlling the corrosion susceptibility of concrete rebar using a half-cell potential method following the ASTM C876-91 standard. Both plant extracts have good anti-corrosion properties, and hence could be applied as green concrete additives to increase the corrosion resistance of the steel reinforcing bars. The anti-corrosion performance of the steel rebars in concrete is remarkably higher with the additions of 1000 and 2000 ppm plant extracts than the additions of waterproofing chemicals used, based on the shifting of corrosion potential (ϕcorr.) values to a more positive direction than −126 mV (SCE). The results agreed that both the plant extracts could be promising for the formulation of effective, ecofriendly anti-corrosion additives to delay the corrosion susceptibility of the concrete infrastructures.

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Mechanochemical Activation of the C‐S‐H binder Celitement

Hinder,

Zimmermann,

Fylak

2023

ce papers

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The hydraulic binder Celitement is produced by a mechanochemical activation of an X‐ray amorphous CSH phase. This process step not only chemically activates the material, but also reduces its specific surface area. Thus, both strength and workability of Celitement based systems can be controlled. In this paper the effect of the duration of the activation milling on chemical and microstructural changes of Celitement is focused. Therefore ATR‐FTIR Spectroscopy, Thermogravimetry, Heatflow Calorimetry, Scanning Electron Microscopy and BET (N2) specific surface area measurements are used aside classical experiments on the flow spread and compressive strength of Celitement based mortars. As a result, it is shown that micro structural changes and chemical activation occur already at the beginning of the activation milling and significantly influence the practical performance of mortars.

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Detailed in situ ATR-FTIR spectroscopy study of the early stages of C-S-H formation during hydration of monoclinic C3S

Cited by 80 publications

References 22 publications

Calcium silicate hydrate—in‐situdevelopment of the silicate structure followed by infrared spectroscopy

Calcium silicate hydrate—in‐situdevelopment of the silicate structure followed by infrared spectroscopy

Study on the effects of green-based plant extracts and water-proofers as anti-corrosion agents for steel-reinforced concrete slabs

Mechanochemical Activation of the C‐S‐H binder Celitement

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