The filler effect

The influence of filler content and type on the hydration rate of tricalcium silicate

Aditya Kumar, Tandre Oey, Gabriel Falzone, Jian Huang, Mathieu Bauchy, Magdalena Balonis, Narayanan Neithalath, Jeffrey Bullard, Gaurav Sant

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The partial replacement of ordinary portland cement (OPC) by fine mineral fillers accelerates the rate of hydration reactions. This acceleration, known as the filler effect, has been attributed to enhanced heterogeneous nucleation of C-S-H on the extra surface provided by fillers. This study isolates the cause of the filler effect by examining how the composition and replacement levels of two filler agents influence the hydration of tricalcium silicate (T1-Ca3SiO5; C3S), a polymorph of the major phase in ordinary portland cement (OPC). For a unit increase in surface area of the filler, C3S reaction rates increase far less than expected. This is because the agglomeration of fine filler particles can render up to 65% of their surface area unavailable for C-S-H nucleation. By analysis of mixtures with equal surface areas, it is hypothesized that limestone is a superior filler as compared to quartz due to the sorption of its aqueous CO3 2- ions by the C-S-H-which in turn releases OH- species to increase the driving force for C-S-H growth. This hypothesis is supported by kinetic data of C3S hydration occurring in the presence of CO3 2- and SO4 2- ions provisioned by readily soluble salts. Contrary to prior investigations, these results suggest that differences in heterogeneous nucleation of the C-S-H on filler particle surfaces, caused due to differences in their interfacial properties, have little if any effect on C3S hydration kinetics.

Original languageEnglish (US)
JournalJournal of the American Ceramic Society
DOIs
StateAccepted/In press - 2017

Fingerprint

Hydration
Silicates
Fillers
Nucleation
Portland cement
Ions
tricalcium silicate
Quartz
Kinetics
Calcium Carbonate
Limestone
Polymorphism
Reaction rates
Minerals
Sorption
Agglomeration
Salts
Chemical analysis

Keywords

  • CS
  • Filler effect
  • Limestone
  • Nucleation
  • Quartz

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

The filler effect : The influence of filler content and type on the hydration rate of tricalcium silicate. / Kumar, Aditya; Oey, Tandre; Falzone, Gabriel; Huang, Jian; Bauchy, Mathieu; Balonis, Magdalena; Neithalath, Narayanan; Bullard, Jeffrey; Sant, Gaurav.

In: Journal of the American Ceramic Society, 2017.

Research output: Contribution to journalArticle

Kumar, Aditya ; Oey, Tandre ; Falzone, Gabriel ; Huang, Jian ; Bauchy, Mathieu ; Balonis, Magdalena ; Neithalath, Narayanan ; Bullard, Jeffrey ; Sant, Gaurav. / The filler effect : The influence of filler content and type on the hydration rate of tricalcium silicate. In: Journal of the American Ceramic Society. 2017.
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