Abstract

Chemical admixtures are often added to concentrated cementitious suspensions in an effort to adjust their (1) rheology, i.e., yield stress and viscosity; (2) time of set, i.e., when plasticity is lost; and (3) hardening rate. Although the first adjustment is affected by dosage of dispersants, the subsequent two adjustments are made by dosing chemical additives that alter the binder's reaction rate. To ensure desirable field performance, e.g., at subambient temperatures, dispersants and reaction rate enhancers may be dosed simultaneously. In such cases, it is critical to ensure that the dosed additives are compatible with each other. To assess such admixture compatibility and synergy, an original rheology-based method is developed. The method involves assessing the yield stress and plastic viscosity of cementitious suspensions with and without admixtures over a wide strain rate range (10-4 ≤ γ ≤ 102). Three fluidity parameters are examined, including (1) plasticity retention; (2) placement limit, i.e., time at which pumpability/pourability is lost; and (3) the rate of hardening following loss of plasticity. To provide a basis of comparison, each of these parameters is assessed relative to neat cement suspensions, across a range of liquid-to-solid ratios (by mass). The method is demonstrated for cementitious suspensions dosed with polycarboxylate ether (PCE) dispersants and calcium nitrate (CN), a set accelerator. The results highlight a means to identify dispersant/set accelerator combinations (or more generally, chemical admixture combinations) that yield optimal synergistic benefits.

Original languageEnglish (US)
Article number04018122
JournalJournal of Materials in Civil Engineering
Volume30
Issue number7
DOIs
StatePublished - Jul 1 2018

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Rheology
Plasticity
Suspensions
Reaction rates
Particle accelerators
Yield stress
Hardening
Viscosity
Fluidity
Binders
Strain rate
Calcium
Nitrates
Ethers
Cements
Ether
Plastics
Liquids
Temperature

Keywords

  • Accelerator
  • Cement paste
  • Dispersants
  • Rheology
  • Workability

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Rheology-based protocol to establish admixture compatibility in dense cementitious suspensions. / Okoronkwo, Monday Uchenna; Falzone, Gabriel; Wada, Akira; Franke, Wolfram; Neithalath, Narayanan; Sant, Gaurav.

In: Journal of Materials in Civil Engineering, Vol. 30, No. 7, 04018122, 01.07.2018.

Research output: Contribution to journalArticle

Okoronkwo, Monday Uchenna ; Falzone, Gabriel ; Wada, Akira ; Franke, Wolfram ; Neithalath, Narayanan ; Sant, Gaurav. / Rheology-based protocol to establish admixture compatibility in dense cementitious suspensions. In: Journal of Materials in Civil Engineering. 2018 ; Vol. 30, No. 7.
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