Crystal structure of magnesium silicate hydrates (M-S-H): The relation with 2:1 Mg–Si phyllosilicates

Roosz, Cédric; Grangeon, Sylvain; Blanc, Philippe; Montouillout, V.; Lothenbach, Barbara; Hénocq, Pierre; Giffaut, Éric; Vieillard, Philippe; Gaboreau, Stéphane

doi:10.1016/j.cemconres.2015.03.014

Cited by 176 publications

(138 citation statements)

References 75 publications

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“…In the case of [B] ini = 9.25 mmol/L, the liquid phase did not reach the equilibrium in 28 days therefore the magnesium concentrations were higher than reported value of M-S-H [20]. The IR spectra of the solid samples from the solutions with silica after 17 days (Figure 6b) are consistent with those of synthesized M-S-H phases [19][20][21][25][26][27] though there is a band at 665 cm −1 , corresponding to Si-O-Si bending vibrations [20,28], which was not observed in our samples. This is likely due to the fact that the reaction times in the experiments here were shorter (only up to 28 days) than those of the previous studies (3 months-2 years), causing the Si-O-Si units to be too little developed to be detected by FT-IR.…”

Section: Influence Of Silica On Boron Sorption Reactionssupporting

confidence: 74%

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Effect of Dissolved Silica on Immobilization of Boron by Magnesium Oxide

2018

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Abstract:The effect of silica on the immobilization reaction of boron by magnesium oxide was investigated by laboratory experiments. In the absence of silica, due to dissolution of the magnesium oxide, boron was removed from solutions by the precipitation of multiple magnesium borates. In the presence of silica, magnesium silica hydrate (M-S-H) was formed as a secondary mineral, which takes up boron. Here 11 B magic-angle spinning nuclear magnetic resonance (MAS-NMR) and Fourier transform infrared spectrometer (FT-IR) data show that a part of the boron would be incorporated into M-S-H structures by isomorphic substitution of silicon. Another experiment where magnesium oxide and amorphous silica were reacted beforehand and boron was added later showed that the shorter the reaction time of the preceding reaction, the higher the sorption ratio of boron. That is, boron was incorporated into the M-S-H mainly by coprecipitation. The experiments in the study here show that the sorption of boron in the presence of silica is mainly due to the incorporation of boron during the formation of the M-S-H structure, which suggests that boron would not readily leach out, and that stable immobilization of boron can be expected.

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Section: Influence Of Silica On Boron Sorption Reactionssupporting

confidence: 74%

“…In both cases, no borates were detected in the solids by XRD, the peaks and signals in the XRD spectra were in agreement with those for M-S-H [19][20][21] and brucite (Figure 5a,d). Therefore, the higher boron sorption ratios in the solutions with silica were the result of formation of M-S-H.…”

Section: Influence Of Silica On Boron Sorption Reactionssupporting

confidence: 69%

Effect of Dissolved Silica on Immobilization of Boron by Magnesium Oxide

2018

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“…3 mm wide Mg-enriched zone along a 30 mm long interface sample was shown on SEM-EDAX composite element maps that coincided also with a Cadepleted zone. Small powder samples from this zone were examined by 29 Si-MAS-NMR and FTIR and the Mgbearing phase was identified as mainly Mg-Si-hydrate, also in analogy to spectra obtained from recent characterisation of synthetic Mg-Si-hydrates Roosz et al 2015;Nied et al 2016). Below, we complement this work and provide also details on the alteration observed on the claystone-side of the interface.…”

Section: Esdred-opalinus Clay Interfacementioning

confidence: 77%

5-year chemico-physical evolution of concrete–claystone interfaces, Mont Terri rock laboratory (Switzerland)

Mäder

Jenni

Lerouge

et al. 2017

Mont Terri Rock Laboratory, 20 Years

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“…The magnesium based hydration products were found to be present in regions devoid of other elements, suggesting the presence of Mg crystals [23]. The observation shows that the M-S-H was less crystalline as observed and when this becomes more crystalline then the strength gain is reduced [24]. The process of increasing the Mg(OH) 2 and other magnesium hydration products improve the mechanical strength and specimen's microstructure as it is observed [21].…”

Section: Microstructure and Elemental Mapping On 56 Days' Hardened Spmentioning

confidence: 63%

An Investigation on Self-Compacting Concrete Using Ultrafine Natural Steatite Powder as Replacement to Cement

Kumar¹,

Sudalaimani²,

Shanmugasundaram³

2017

Advances in Materials Science and Engineering

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An experimental investigation was made on flow properties and compressive strength of self-compacting concrete (SCC) with ultrafine natural steatite powder (UFNSP) as replacement to cement. The tests were conducted on specimens with 5%, 10%, 15%, 20%, and 25% of replacement of UFNSP to the weight of cement and compared to the control specimens. The flow properties of all specimens were tested and checked for their limit with the existing guidelines. The compressive strength test was done on all specimens for strength of 7 days, 14 days, 28 days, and 56 days. The hardened samples were tested for their microstructural behavior and the elements Mg, Ca, and Si were mapped. Through mapping, the formations of M-S-H along with C-S-H are observed. The results show that the addition of UFNSP influences the flow property, by reducing the flow, and increases the compressive strength till 20% replacement. Further the addition of UFNSP increases the denseness of microstructure of the specimens thus resulting in the strength increment.

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Crystal structure of magnesium silicate hydrates (M-S-H): The relation with 2:1 Mg–Si phyllosilicates

Cited by 176 publications

References 75 publications

Effect of Dissolved Silica on Immobilization of Boron by Magnesium Oxide

Effect of Dissolved Silica on Immobilization of Boron by Magnesium Oxide

5-year chemico-physical evolution of concrete–claystone interfaces, Mont Terri rock laboratory (Switzerland)

An Investigation on Self-Compacting Concrete Using Ultrafine Natural Steatite Powder as Replacement to Cement

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