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 language | English (US) |
|---|---|
| Title of host publication | Transition from Fluid to Solid |
| Subtitle of host publication | Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference |
| Pages | 96-108 |
| Number of pages | 13 |
| Edition | 259 SP |
| State | Published - Nov 23 2009 |
| Event | Transition 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 2009 → Mar 19 2009 |
Other
| Other | Transition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference |
|---|---|
| Country/Territory | United States |
| City | San Antonio, TX |
| Period | 3/15/09 → 3/19/09 |
Keywords
- FBRM
- Flocculation
- SCC
- Superplasticizer
- Viscosity-modifying agents
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Materials Science(all)