Calcium chloride acceleration in ordinary Portland cement

Tapio Vehmas, Anna Kronlöf, Andrzej Cwirzen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Early-age hydration of ordinary Portland cement is now acknowledged to originate from nucleation and crystal growth of calcium-silicate-hydrates. The acceleration mechanism of water-soluble inorganic substances, such as calcium chloride, is still unclear. In the present study, the acceleration mechanism was approached in two independent ways. First, the acceleration effect of filler materials (limestone and quartz powder) and calcium chloride (CaCl2) were studied experimentally with a conduction calorimeter. Second, the calcium chloride effect was studied with thermodynamic modelling. The experimental test results showed that the filler materials accelerated the acceleration period of ordinary Portland cement hydration, whereas calcium chloride accelerated hydration throughout the 24 h measuring period. A synergistic effect was observed with fillers and calcium chloride. Thermodynamic modelling indicated that calcium chloride provides a supersaturation with respect to pure calcium-silicate-hydrate. It was concluded that the supersaturation provides a qualitative explanation for both calcium chloride-induced acceleration and the synergistic effect observed with fillers.

Original languageEnglish
Pages (from-to)856-863
Number of pages8
JournalMagazine of Concrete Research
Volume70
Issue number16
DOIs
Publication statusPublished - 1 Aug 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

Calcium Chloride
Calcium chloride
Portland cement
Fillers
Hydration
Silicic Acid
Calcium silicate
Supersaturation
Hydrates
Thermodynamics
Quartz
Calcium Carbonate
Crystallization
Limestone
Calorimeters
Crystal growth
Powders
Nucleation
Water

Keywords

  • Admixtures
  • Cement
  • Cementitious materials
  • Modeling

Cite this

Vehmas, Tapio ; Kronlöf, Anna ; Cwirzen, Andrzej. / Calcium chloride acceleration in ordinary Portland cement. In: Magazine of Concrete Research. 2018 ; Vol. 70, No. 16. pp. 856-863.
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Calcium chloride acceleration in ordinary Portland cement. / Vehmas, Tapio; Kronlöf, Anna; Cwirzen, Andrzej.

In: Magazine of Concrete Research, Vol. 70, No. 16, 01.08.2018, p. 856-863.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Calcium chloride acceleration in ordinary Portland cement

AU - Vehmas, Tapio

AU - Kronlöf, Anna

AU - Cwirzen, Andrzej

PY - 2018/8/1

Y1 - 2018/8/1

N2 - Early-age hydration of ordinary Portland cement is now acknowledged to originate from nucleation and crystal growth of calcium-silicate-hydrates. The acceleration mechanism of water-soluble inorganic substances, such as calcium chloride, is still unclear. In the present study, the acceleration mechanism was approached in two independent ways. First, the acceleration effect of filler materials (limestone and quartz powder) and calcium chloride (CaCl2) were studied experimentally with a conduction calorimeter. Second, the calcium chloride effect was studied with thermodynamic modelling. The experimental test results showed that the filler materials accelerated the acceleration period of ordinary Portland cement hydration, whereas calcium chloride accelerated hydration throughout the 24 h measuring period. A synergistic effect was observed with fillers and calcium chloride. Thermodynamic modelling indicated that calcium chloride provides a supersaturation with respect to pure calcium-silicate-hydrate. It was concluded that the supersaturation provides a qualitative explanation for both calcium chloride-induced acceleration and the synergistic effect observed with fillers.

AB - Early-age hydration of ordinary Portland cement is now acknowledged to originate from nucleation and crystal growth of calcium-silicate-hydrates. The acceleration mechanism of water-soluble inorganic substances, such as calcium chloride, is still unclear. In the present study, the acceleration mechanism was approached in two independent ways. First, the acceleration effect of filler materials (limestone and quartz powder) and calcium chloride (CaCl2) were studied experimentally with a conduction calorimeter. Second, the calcium chloride effect was studied with thermodynamic modelling. The experimental test results showed that the filler materials accelerated the acceleration period of ordinary Portland cement hydration, whereas calcium chloride accelerated hydration throughout the 24 h measuring period. A synergistic effect was observed with fillers and calcium chloride. Thermodynamic modelling indicated that calcium chloride provides a supersaturation with respect to pure calcium-silicate-hydrate. It was concluded that the supersaturation provides a qualitative explanation for both calcium chloride-induced acceleration and the synergistic effect observed with fillers.

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