Flocculation in cement pastes measured through use of laser microscopy

R. P. Ferron, C. Negro, Surendra P Shah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Structural build-up that occurs during the induction period is of particular interest to users of self-consolidating concrete (SCC) since it can affect the workability of concrete. A novel experimental device based on scanning laser microscopy was used to directly monitor particle flocculation in SCC cement pastes. This is one of the few studies in which this experimental method has been used to study flocculation in concentrated suspensions. This paper discusses the results from a study that was carried out to investigate the flocculation and floc properties in SCC cement pastes. Results show that the floc network is immediately broken down by superplasticizers and that the rate of reflocculation decreases when the water-to-cement (w/c) ratio is decreased. An increase in w/c ratio resulted in a reduction in floc strength. Results show that viscosity modifying agents can induce flocculation due to different flocculation mechanisms.

Original languageEnglish (US)
Title of host publicationTransition from Fluid to Solid
Subtitle of host publicationRe-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference
Pages96-108
Number of pages13
Edition259 SP
StatePublished - Nov 23 2009
EventTransition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference - San Antonio, TX, United States
Duration: Mar 15 2009Mar 19 2009

Other

OtherTransition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference
CountryUnited States
CitySan Antonio, TX
Period3/15/093/19/09

Keywords

  • FBRM
  • Flocculation
  • SCC
  • Superplasticizer
  • Viscosity-modifying agents

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Flocculation in cement pastes measured through use of laser microscopy'. Together they form a unique fingerprint.

Cite this