Flocculation in cement pastes measured through use of laser microscopy

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

Flocculation in cement pastes measured through use of laser microscopy

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

Civil and Environmental Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 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	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)

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title = "Flocculation in cement pastes measured through use of laser microscopy",

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.",

keywords = "FBRM, Flocculation, SCC, Superplasticizer, Viscosity-modifying agents",

author = "Ferron, {R. P.} and C. Negro and Shah, {Surendra P}",

year = "2009",

month = nov,

day = "23",

language = "English (US)",

isbn = "9781615671465",

pages = "96--108",

booktitle = "Transition from Fluid to Solid",

edition = "259 SP",

note = "Transition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference ; Conference date: 15-03-2009 Through 19-03-2009",

}

Ferron, RP, Negro, C & Shah, SP 2009, Flocculation in cement pastes measured through use of laser microscopy. in Transition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference. 259 SP edn, pp. 96-108, 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, 3/15/09.

Flocculation in cement pastes measured through use of laser microscopy. / Ferron, R. P.; Negro, C.; Shah, Surendra P.

Transition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference. 259 SP. ed. 2009. p. 96-108.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Flocculation in cement pastes measured through use of laser microscopy

AU - Ferron, R. P.

AU - Negro, C.

AU - Shah, Surendra P

PY - 2009/11/23

Y1 - 2009/11/23

N2 - 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.

AB - 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.

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KW - SCC

KW - Superplasticizer

KW - Viscosity-modifying agents

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