Effect of hydration temperature on the solubility behavior of Ca-, S-, Al-, and Si-bearing solid phases in Portland cement pastes

Thomas, Jeffrey J.; Rothstein, David; Jennings, Hamlin M.; Christensen, B. J.

doi:10.1016/s0008-8846(03)00224-2

Cited by 111 publications

(54 citation statements)

References 24 publications

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“…The SEM micrographs show that, at early ages, the main hydration products were the ettringite (AFt) crystals and amorphous gels, such as the calcium silicate hydrate (C-S-H) or the calcium aluminum silicate hydrate (C-A-S-H) (26,(36)(37)(38). In this study, the AFt formation in the SFC cement likely complies with both Type I and Type II AFt crystals, as described by Mehta (39).…”

Section: Microstructural Analysessupporting

confidence: 69%

Physical-chemical characteristics of an eco-friendly binder using ternary mixture of industrial wastes

Nguyen¹,

Chang²,

Chen³

et al. 2015

Mater. construcc.

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This study explores the physical-chemical characteristics of paste and mortar with an eco-friendly binder named as SFC cement, produced by a ternary mixture of industrial waste materials of ground granulated blast furnace slag (S), Class F fly ash (FFA), and circulating fluidized bed combustion fly ash (CFA). To trigger the hydration, the CFA, which acted as an alkaline-sulfate activator, was added to the blended mixture of slag and FFA. The water to binder ratio (W/B), curing regime, and FFA addition significantly affected the engineering performances and shrinkage/expansion of the SFC pastes and mortars. The SFC mortars had higher workability than that of ordinary Portland cement (OPC). With similar workability, the SFC mortars had compressive strengths and expansions comparable to OPC mortars. The main hydration products of the hardened SFC cement were ettringite (AFt) and C-S-H/C-A-S-H. The transformation of the AFt to the monosulfates was observed as the hydration time increased.

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Section: Microstructural Analysessupporting

confidence: 69%

Physical-chemical characteristics of an eco-friendly binder using ternary mixture of industrial wastes

Nguyen¹,

Chang²,

Chen³

et al. 2015

Mater. construcc.

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show abstract

“…Generally, the composition in pore solution is determined by the dissolution of the clinker phases as well as the sulfate carriers in the cement and the precipitation of the hydration products, such as ettringite, portlandite and [13][14][15][16][17][18][19][20][21][22][23][24]. During the first hours of hydration, the pore solution is dominated by high concentration ions including sodium, potassium, calcium, sulfate and hydroxide in an order of tens to hundreds millimole per liter, together with some low concentration elements such as Al, Fe and Si in an order of several tens micromole per liter.…”

Section: Pore Solution Analysismentioning

confidence: 99%

Influence of triethanolamine on the hydration product of portlandite in cement paste and the mechanism

Zhang

Kong

et al. 2016

Cement and Concrete Research

174

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“…Figure 9 shows the measured (points) and computed (lines) pH values of the aqueous solution plotted versus the Ca/Si ratio of the solid with which the solution is in equilibrium. Computed pH values were calculated by balancing the charge of the aqueous species (e.g., CaOH + , H 2 SiO 4 2-), the distribution of which was calculated from the measured Ca and Si concentrations using a geochemical modeling program, PHREEQC [72]; the Debye-Huckel or the Davies equation was used to account for non-ideal behavior, and the ionic association constants used here are listed elsewhere [73]. For the pH values above 11.5 (the range with which we are most concerned), all values (except for several belonging to group 4) were generally within ± 0.05 of the computed values, thereby giving a selfconsistent check for the analyses of the solutions.…”

Section: Si Nmrmentioning

confidence: 99%

Solubility and structure of calcium silicate hydrate

Chen

Thomas

Taylor³

et al. 2004

Cement and Concrete Research

Self Cite

739

414

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C-S-H, the poorly crystalline calcium silicate hydrate formed in cement paste and aqueous suspension, is characterized by extensive disorder and structural variations at the nanometer scale. An analysis of new and published solubility data for C-S-H formed by different preparation methods and with a broad range of compositions illustrates a previously unrecognized family of solubility curves in the CaO-SiO 2 -H 2 O system at room temperature. As demonstrated by 29 Si magic-angle spinning (MAS) NMR data and by charge balance calculations, the observed differences in solubility arise from systematic variations in Ca/Si ratio, silicate structure, and Ca-OH content. Based on this evidence, the family of solubility curves are interpreted to represent a spectrum of metastable C-S-H phases whose structures range from purely tobermorite-like to largely jennite-like. These findings give an improved understanding of the structure of these phases and reconcile some of the discrepancies in the literature regarding the structure of C-S-H at high Ca/Si ratios.

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Effect of hydration temperature on the solubility behavior of Ca-, S-, Al-, and Si-bearing solid phases in Portland cement pastes

Cited by 111 publications

References 24 publications

Physical-chemical characteristics of an eco-friendly binder using ternary mixture of industrial wastes

Physical-chemical characteristics of an eco-friendly binder using ternary mixture of industrial wastes

Influence of triethanolamine on the hydration product of portlandite in cement paste and the mechanism

Solubility and structure of calcium silicate hydrate

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