Effect of silica particle size on the formation of calcium silicate hydrate [C-S-H] using thermal analysis

Riccardo Maddalena, Christopher Hall, Andrea Hamilton

Research output: Contribution to journalArticle

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Abstract

Calcium silicate hydrate (C-S-H) is made by mixing calcium hydroxide (portlandite), silica and water at two calcium oxide to silica (C/S) ratios, using nano-silica and silica fume. We investigate how silica particle size influences the rate and extent of formation of C-S-H at room temperature by isothermal calorimetry, thermal analysis, Raman spectroscopy and X-ray diffraction. Rate of reaction increases as silica particle size decreases, and is five times greater with nano-silica than with silica fume. Final composition depends only on initial C/S ratio. Compositions at 28 days are estimated from thermogravimetric and X-ray diffraction data. There is a weak maximum in the reaction rate of nanosilica pastes about 20–30 h after mixing. The overall kinetics is well described by a simple exponential (first-order) reaction model. The early-time reaction rate around the rate maximum is described by an Avrami model.

Original languageEnglish
Pages (from-to)142-149
Number of pages8
JournalThermochimica acta
Volume672
Early online date7 Sep 2018
DOIs
Publication statusPublished - 28 Feb 2019

Fingerprint

Silicic Acid
calcium silicates
Calcium silicate
Hydrates
Silicon Dioxide
hydrates
Thermoanalysis
thermal analysis
Particle size
Silica
silicon dioxide
Silica fume
fumes
Reaction rates
Calcium Hydroxide
X ray diffraction
Hydrated lime
reaction kinetics
Calorimetry
Ointments

Keywords

  • calcium silicate hydrate
  • nano-silica
  • silica fume
  • heat of hydration
  • calorimetry
  • Raman spectra

Cite this

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abstract = "Calcium silicate hydrate (C-S-H) is made by mixing calcium hydroxide (portlandite), silica and water at two calcium oxide to silica (C/S) ratios, using nano-silica and silica fume. We investigate how silica particle size influences the rate and extent of formation of C-S-H at room temperature by isothermal calorimetry, thermal analysis, Raman spectroscopy and X-ray diffraction. Rate of reaction increases as silica particle size decreases, and is five times greater with nano-silica than with silica fume. Final composition depends only on initial C/S ratio. Compositions at 28 days are estimated from thermogravimetric and X-ray diffraction data. There is a weak maximum in the reaction rate of nanosilica pastes about 20–30 h after mixing. The overall kinetics is well described by a simple exponential (first-order) reaction model. The early-time reaction rate around the rate maximum is described by an Avrami model.",
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Effect of silica particle size on the formation of calcium silicate hydrate [C-S-H] using thermal analysis. / Maddalena, Riccardo; Hall, Christopher; Hamilton, Andrea.

In: Thermochimica acta, Vol. 672, 28.02.2019, p. 142-149.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of silica particle size on the formation of calcium silicate hydrate [C-S-H] using thermal analysis

AU - Maddalena, Riccardo

AU - Hall, Christopher

AU - Hamilton, Andrea

PY - 2019/2/28

Y1 - 2019/2/28

N2 - Calcium silicate hydrate (C-S-H) is made by mixing calcium hydroxide (portlandite), silica and water at two calcium oxide to silica (C/S) ratios, using nano-silica and silica fume. We investigate how silica particle size influences the rate and extent of formation of C-S-H at room temperature by isothermal calorimetry, thermal analysis, Raman spectroscopy and X-ray diffraction. Rate of reaction increases as silica particle size decreases, and is five times greater with nano-silica than with silica fume. Final composition depends only on initial C/S ratio. Compositions at 28 days are estimated from thermogravimetric and X-ray diffraction data. There is a weak maximum in the reaction rate of nanosilica pastes about 20–30 h after mixing. The overall kinetics is well described by a simple exponential (first-order) reaction model. The early-time reaction rate around the rate maximum is described by an Avrami model.

AB - Calcium silicate hydrate (C-S-H) is made by mixing calcium hydroxide (portlandite), silica and water at two calcium oxide to silica (C/S) ratios, using nano-silica and silica fume. We investigate how silica particle size influences the rate and extent of formation of C-S-H at room temperature by isothermal calorimetry, thermal analysis, Raman spectroscopy and X-ray diffraction. Rate of reaction increases as silica particle size decreases, and is five times greater with nano-silica than with silica fume. Final composition depends only on initial C/S ratio. Compositions at 28 days are estimated from thermogravimetric and X-ray diffraction data. There is a weak maximum in the reaction rate of nanosilica pastes about 20–30 h after mixing. The overall kinetics is well described by a simple exponential (first-order) reaction model. The early-time reaction rate around the rate maximum is described by an Avrami model.

KW - calcium silicate hydrate

KW - nano-silica

KW - silica fume

KW - heat of hydration

KW - calorimetry

KW - Raman spectra

UR - https://www.sciencedirect.com/journal/thermochimica-acta

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DO - 10.1016/j.tca.2018.09.003

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VL - 672

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JO - Thermochimica acta

JF - Thermochimica acta

SN - 0040-6031

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