Leaching behaviour of low Ca:Si ratio CaO–SiO2–H2O systems

Swanton, S.W.; Heath, Timothy G.; Clacher, A. P.

doi:10.1016/j.cemconres.2016.06.001

Cited by 32 publications

(8 citation statements)

References 31 publications

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“…Little difference was observed in the concentrations and pH values between 1 and 2 years confirming that the samples were very close to equilibrium. C-S-H phases are not stable at this range of pH (<9.5) (Bernard et al, 2017a;Leisinger et al, 2014;Peyronnard et al, 2009;Shi and Stegemann, 2000;Swanton et al, 2016). It can be noted however that the calcium concentrations were much lower (0.15 to 0.46 mmol/L, depending on the initial calcium content, temperature and time) than the total amount of calcium that could theoretically be present in solution (11.93 ± 1.50 and 23.66 ± 2.60 mmol/L), which suggests the uptake of calcium by the solid…”

Section: Aqueous Phase Compositionmentioning

confidence: 97%

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Bernard

Lothenbach

Cau-dit-Coumes

et al. 2018

Applied Geochemistry

110

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Calcium silicate hydrate (C-S-H) and magnesium silicate hydrate (M-S-H) have been described as two separate phases. This work investigates their stability domains and the possible uptake of small amounts of magnesium by C-S-H or, reversely, the uptake of small amounts of calcium by M-S-H. The phases, synthesized by co-precipitation, are characterized using a large panel of techniques (thermogravimetry analysis, X-ray diffraction, X-ray pair distribution function analysis, 29 Si MAS-NMR spectroscopy, 17 measurement of zeta potential and cation exchange capacity) while the compositions of the solutions at 18 equilibrium are determined by ion chromatography and pH measurements. Syntheses of C-S-H samples 19 in the presence of magnesium ((Ca+Mg)/Si = 0.8 and Mg/Si = 0.05 or 0.10) yield two separate phases: 20

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Section: Aqueous Phase Compositionmentioning

confidence: 97%

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Bernard

Lothenbach

Cau-dit-Coumes

et al. 2018

Applied Geochemistry

110

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“…Furthermore, amorphous silica was found to be present next to C-S-H for low Ca/Si (see e.g. [55,77]). These results are consistent with our observations.…”

Section: Decomposition Of C-s-hmentioning

confidence: 99%

Effect of relative humidity on the carbonation rate of portlandite, calcium silicate hydrates and ettringite

Steiner

Lothenbach

Proske

et al. 2020

Cement and Concrete Research

183

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“…Moreover, the self-condensation reaction of liquid sodium silicate could pre-condense BA and GGBFS particles, this providing a good carrier for the formation of C-A-S-H and C-S-H gels. C-A-S-H and C-S-H gels are continuously formed both inside and outside of BA and GGBFS particles, which formed a complete and compact gel structure with sufficient polymerization reaction (as shown in Figure 5(A-8-3)) [53].…”

Section: Polymerization Mechanism Underlying Mixed Initiator Excitationmentioning

confidence: 98%

Positive Influence of Liquid Sodium Silicate on the Setting Time, Polymerization, and Strength Development Mechanism of MSWI Bottom Ash Alkali-Activated Mortars

Jin

Huang

et al. 2021

Materials

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Setting time and mechanical properties are key metrics needed to assess the properties of municipal solid waste incineration (MSWI) bottom ash alkali-activated samples. This study investigated the solidification law, polymerization, and strength development mechanism in response to NaOH and liquid sodium silicate addition. Scanning electron microscopy and X-ray diffraction were used to identify the formation rules of polymerization products and the mechanism of the underlying polymerization reaction under different excitation conditions. The results identify a strongly alkaline environment as the key factor for the dissolution of active substances as well as for the formation of polymerization products. The self-condensation reaction of liquid sodium silicate in the supersaturated state (caused by the loss of free water) is the major reason for the rapid coagulation of alkali-activated samples. The combination of both NaOH and liquid sodium silicate achieves the optimal effect, because they play a compatible coupling role.

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Leaching behaviour of low Ca:Si ratio CaO–SiO2–H2O systems

Cited by 32 publications

References 31 publications

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Effect of relative humidity on the carbonation rate of portlandite, calcium silicate hydrates and ettringite

Positive Influence of Liquid Sodium Silicate on the Setting Time, Polymerization, and Strength Development Mechanism of MSWI Bottom Ash Alkali-Activated Mortars

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