Effect of temperature on hydration kinetics and polymerization of tricalcium silicate in stirred suspensions of CaO-saturated solutions

Grant, Stephanie; Boitnott, Ginger; Korhonen, Charles J.; Sletten, R. S.

doi:10.1016/j.cemconres.2005.10.001

Cited by 24 publications

(11 citation statements)

References 6 publications

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“…Therefore, inasmuch as the MCL rose with temperature at all ages, temperature affected not only the hydration rate but also the structure of the C–S–H gel formed. Similar results can be found in the literature …”

Section: Resultssupporting

confidence: 92%

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Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure

et al. 2012

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This study aimed to monitor the effect of temperature and the addition of nanosilica on the nanostructure of the C–S–H gel forming during tricalcium silicate (C3S) hydration. Two types of paste were prepared from a synthesized T1 C3S. The first consisted of a blend of deionized water and C3S at a water/solid ratio of 0.425. In the second, a 90 wt% C3S + 10 wt% of nanosilica blend was mixed with water at a water/solid ratio of 0.7. The pastes were stored in closed containers at 100% RH and 25°C, 40°C, or 65°C. The hydration reaction was detained after 1, 14, 28, or 62 d with acetone, and then pastes were studied by 29Si magic angle spinning nuclear magnetic resonance (29Si MAS NMR).The main conclusion was that adding nSA expedites C3S hydration at any age or temperature and modifies the structure of the C–S–H gel formed, two types of C–S–H gel appear. At 25°C and 40°C, more orderly, longer chain gels are initially (1 d) obtained as a result of the pozzolanic reaction between nSA and portlandite (CH) (C–S–HII gel formation). Subsequently, ongoing C3S hydration and the concomitant flow of dimers shorten the mean chain length in the gel.

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Section: Resultssupporting

confidence: 92%

“…Similar results can be found in the literature. 2,34 (4) C 3 S Hydration + Amorphous Nanosilica The spectra for C 3 S pastes containing 10 wt% nSA at different ages and temperatures are reproduced in Fig. 11.…”

Section: Resultsmentioning

confidence: 99%

Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure

et al. 2012

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“…[7][8][9][10][11][12] However, the value for 101C does not follow the same trend, a phenomenon also noted in another study. 15 The rate constants k B and k avr have similar temperature dependences, and the deviation from linearity in both cases can be attributed to their dependence on the nucleation rate, which itself has a strongly nonlinear temperature dependence.…”

Section: Resultsmentioning

confidence: 96%

“…There is significant evidence that the early hydration period occurs by a nucleation and growth process, and kinetic data from C 3 S hydration are frequently fitted to the standard Avrami-type nucleation and growth equation, as this provides a satisfactory fit to a limited portion of the data in the vicinity of the rate peak [7][8][9][10][11][12][13][14][15] (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Modeling the Nucleation and Growth Kinetics of Tricalcium Silicate Hydration

Thomas

2007

Journal of the American Ceramic Society

270

183

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The hydration kinetics of tricalcium silicate (C 3 S), the main constituent of portland cement, were analyzed with a mathematical ''boundary nucleation'' model in which nucleation of the hydration product occurs only on internal boundaries corresponding to the C 3 S particle surfaces. This model more closely approximates the C 3 S hydration process than does the widely used Avrami nucleation and growth model. In particular, the boundary model accounts for the important effect of the C 3 S powder surface area on the hydration kinetics. Both models were applied to isothermal calorimetry data from hydrating C 3 S pastes in the temperature range of 101-401C. The boundary nucleation model provides a better fit to the early hydration rate peak than does the Avrami model, despite having one less varying parameter. The nucleation rate (per unit area) and the linear growth rate of the hydration product were calculated from the fitted values of the rate constants and the independently measured powder surface area. The growth rate follows a simple Arrhenius temperature dependence with a constant activation energy of 31.2 kJ/mol, while the activation energy associated with the nucleation rate increases with increasing temperature. The start of the nucleation and growth process coincides with the time of initial mixing, indicating that the initial slow reaction period known as the ''induction period'' is not a separate chemical process as has often been hypothesized.

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“…In contrast, isothermal calorimetry measures the net reaction exotherm associated with the hydration reactions. Because the exothermic reaction step is the dissolution of the cement minerals, particularly tricalcium silicate, 27 isothermal calorimetry effectively measures the rate of cement or C 3 S consumption rather than the formation of the hydration product.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nucleation Seeding on the Hydration Mechanisms of Tricalcium Silicate and Cement

2009

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The fundamental chemical hydration process of portland cement and its main mineral component, tricalcium silicate, was studied by investigating the effects of various additives. A relatively small amount (1-4 wt %) of well-dispersed calcium silicate hydrate (C-S-H), a pure form of the main hydration product, significantly increases both the early hydration rate and the total amount of hydration during the early nucleation and growth period (the first ∼24 h), as measured by calorimetry. This is attributed to a seeding effect whereby the C-S-H additive provides new nucleation sites within the pore space away from the particle surfaces. This mechanism is verified by a digital simulation of the hydration process that reproduces key features of the hydration kinetics. The results provide strong evidence that the hydration process is autocatalytic such that the C-S-H gel product stimulates its own formation. The seeding effect of C-S-H also provides a new explanation of the hydration-accelerating effects of various forms of reactive silica because these additives form C-S-H by reacting with aqueous calcium ions released by cement dissolution. Experiments involving sucrose, a hydration retarder, confirm that sucrose interferes with the normal nucleation process on the particle surface.

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Effect of temperature on hydration kinetics and polymerization of tricalcium silicate in stirred suspensions of CaO-saturated solutions

Cited by 24 publications

References 6 publications

Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure

Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure

A New Approach to Modeling the Nucleation and Growth Kinetics of Tricalcium Silicate Hydration

Influence of Nucleation Seeding on the Hydration Mechanisms of Tricalcium Silicate and Cement

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Effect of temperature on hydration kinetics and polymerization of tricalcium silicate in stirred suspensions of CaO-saturated solutions

Cited by 24 publications

References 6 publications

Effect of Temperature on C3S and C3S + Nanosilica Hydration and C–S–H Structure

Effect of Temperature on C3S and C3S + Nanosilica Hydration and C–S–H Structure

A New Approach to Modeling the Nucleation and Growth Kinetics of Tricalcium Silicate Hydration

Influence of Nucleation Seeding on the Hydration Mechanisms of Tricalcium Silicate and Cement

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Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure

Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure