Kinetics of the hydration reactions in the cement paste with mechanochemically modified cement 29Si magic-angle-spinning NMR study

Johansson, Karin; Larsson, Christer; Antzutkin, Oleg N.; Forsling, Willis; Kota, Hanumantha Rao; Ronin, Vladimir

doi:10.1016/s0008-8846(99)00135-0

Cited by 49 publications

(27 citation statements)

References 10 publications

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“…The resonance in this figure was divided into five ranges: −65 to −75 ppm belonged to Q 0 ; near −80 ppm belonged to Q 1 ; near −85 ppm belonged to Q 2 ; near −100 ppm belonged to Q 3 ; and near −110 ppm belonged to Q 4 [26,27,28]. The resonance peak of Q 0 originated from silicate monomer, and in this study, it came from unreacted C 3 S. The resonance peaks of Q 1 and Q 2 originated from the end and middle of the C–S–H chain structure.…”

Section: Resultsmentioning

confidence: 99%

Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

Shao

2018

Materials

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This paper presents a study on the carbonation reaction heat and products of tricalcium silicate (C3S) paste exposed to carbon dioxide (CO2) for rapid curing. Reaction heat was measured using a retrofitted micro-calorimeter. The highest heat flow of a C3S paste subject to carbonation curing was 200 times higher than that by hydration, and the cumulative heat released by carbonation was three times higher. The compressive strength of a C3S paste carbonated for 2 h and 24 h was 27.5 MPa and 62.9 MPa, respectively. The 24-h carbonation strength had exceeded the hydration strength at 28 days. The CO2 uptake of a C3S paste carbonated for 2 h and 24 h was 17% and 26%, respectively. The X-ray diffraction (XRD), transmission electron microscope coupled with energy dispersive spectrometer (TEM-EDS), and 29Si magic angle spinning–nuclear magnetic resonance (29Si MAS-NMR) results showed that the products of a carbonated C3S paste were amorphous silica (SiO2) and calcite crystal. There was no trace of calcium silicate hydrate (C–S–H) or other polymorphs of calcium carbonate (CaCO3) detected.

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Section: Resultsmentioning

confidence: 99%

Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

Shao

2018

Materials

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“…29 Si MAS‐NMR can give a clear indication of the number of bridging oxygen in a particular SiO 4 unit. A growing number of bridging oxygen atoms per Si tetrahedron (i.e., increased polymerization) results in shifts to higher fields because of increased shielding of 29 Si nuclei by the surrounding electrons …”

Section: Resultsmentioning

confidence: 99%

Alkali Activation of AOD Stainless Steel Slag Under Steam Curing Conditions

et al. 2015

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Crystalline argon oxygen decarburization slag, in powdery form, was investigated for its hydration potential by alkali activation and curing at 80°C. Na-silicate and K-silicate of the same modulus were used as activators. Isothermal calorimetry at 80°C indicated exothermic reactions in the slag pastes. When the slag mortars were cured under steam at 80°C appreciable gain in compressive strength was measured. This was attributed to C-S-H which was detected in TG, FTIR, and 29 Si NMR analyses. Upon hydration at 90 d, the amount of crystalline phases decreased, whereas the XRD amorphous content in the slag increased. Electron microscopy showed the formation of different morphologies of reaction products depending on the alkaline activator employed. Presence of reaction rims around the crystalline phases with a major presence of Ca, Si, and O in the reacted matrix was observed in elemental maps.

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“…Overlapped Q 0 species were found at − 71.1 ppm, − 72.6 ppm and − 74.6 ppm; these corresponded to isolated SiO 4 tetrahedra of non-hydrated alite (Q 0 A ) and belite (Q 0 B ) [27,28]. Q 1 and Q 2 species, characteristic of end chain and middle chain SiO 4 tetrahedra, according to Taylor's model of C-S-H, were found at − 80.0 ppm (Q 1 C-S-H ) and − 85.7 ppm (Q 2 C-S-H ) [11,[29][30][31].…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

Structural and nano-mechanical properties of Calcium Silicate Hydrate (C-S-H) formed from alite hydration in the presence of sodium and potassium hydroxide

Reales

Giraldo

Camargo

et al. 2015

Cement and Concrete Research

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Kinetics of the hydration reactions in the cement paste with mechanochemically modified cement 29Si magic-angle-spinning NMR study

Cited by 49 publications

References 10 publications

Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

Alkali Activation of AOD Stainless Steel Slag Under Steam Curing Conditions

Structural and nano-mechanical properties of Calcium Silicate Hydrate (C-S-H) formed from alite hydration in the presence of sodium and potassium hydroxide

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