Biomass fly ash effect on fresh and hardened state properties of cement based materials

Rejini Rajamma, L Senff, M J Ribeiro, J A Labrincha, Richard Ball, G C Allen, V M Ferreira

Research output: Contribution to journalArticle

  • 26 Citations

Abstract

Cement pastes and mortars were prepared by replacing ordinary Portland cement with different dosages
of biomass fly ashes (0, 10, 20 and 30% BFA) whilst in dry condition. The effect of BFA on the flow
behaviour (spread on table and rheology), setting time, temperature of hydration and electrical resistivity
was studied in this experimental research. Increasing the amount of BFA in the compositions required
extra dosage of water, as a result of particles fineness, tendency for agglomeration and retention/absorption
of water molecules. As a consequence, the relative amount of free water diminishes and the
flowability is poorer. The introduction of BFA also led to an increase in setting time, while the resistivity
obtained from the impedance measurements tends to be lower than the reference paste (ash-free). The
higher concentration of mobile species in the pore solution, namely sodium ions introduced by the ash,
explains that tendency. The hydration temperature of cement pastes tends to decrease with the level of
cement to ash replacement. Between the two tested ashes (from grate and fluidized sand bed furnaces),
differences in particle size and shape, in the amount of residual organic matter and concentration of
inorganic components define minor changes in the workability and setting behaviour. Therefore, the
introduction of biomass fly ashes affects the hardened state features but do not compromise them.
LanguageEnglish
Pages1-9
JournalComposites Part B - Engineering
Volume77
Early online date12 Mar 2015
DOIs
StatusPublished - Aug 2015

Fingerprint

Ashes
Coal Ash
Fly ash
Cements
Biomass
Ointments
Hydration
Water
Portland cement
Mortar
Rheology
Biological materials
Furnaces
Sand
Agglomeration
Sodium
Particle size
Ions
Temperature
Molecules

Keywords

  • Recycling
  • Rheological properties
  • Physical properties
  • Mechanical testing

Cite this

Rajamma, R., Senff, L., Ribeiro, M. J., Labrincha, J. A., Ball, R., Allen, G. C., & Ferreira, V. M. (2015). Biomass fly ash effect on fresh and hardened state properties of cement based materials. DOI: 10.1016/j.compositesb.2015.03.019

Biomass fly ash effect on fresh and hardened state properties of cement based materials. / Rajamma, Rejini; Senff, L; Ribeiro, M J; Labrincha, J A; Ball, Richard; Allen, G C; Ferreira, V M.

In: Composites Part B - Engineering, Vol. 77, 08.2015, p. 1-9.

Research output: Contribution to journalArticle

Rajamma, R, Senff, L, Ribeiro, MJ, Labrincha, JA, Ball, R, Allen, GC & Ferreira, VM 2015, 'Biomass fly ash effect on fresh and hardened state properties of cement based materials' Composites Part B - Engineering, vol. 77, pp. 1-9. DOI: 10.1016/j.compositesb.2015.03.019
Rajamma, Rejini ; Senff, L ; Ribeiro, M J ; Labrincha, J A ; Ball, Richard ; Allen, G C ; Ferreira, V M. / Biomass fly ash effect on fresh and hardened state properties of cement based materials. In: Composites Part B - Engineering. 2015 ; Vol. 77. pp. 1-9
@article{4d4130f0d54b4b389116124d8b6591ee,
title = "Biomass fly ash effect on fresh and hardened state properties of cement based materials",
abstract = "Cement pastes and mortars were prepared by replacing ordinary Portland cement with different dosagesof biomass fly ashes (0, 10, 20 and 30{\%} BFA) whilst in dry condition. The effect of BFA on the flowbehaviour (spread on table and rheology), setting time, temperature of hydration and electrical resistivitywas studied in this experimental research. Increasing the amount of BFA in the compositions requiredextra dosage of water, as a result of particles fineness, tendency for agglomeration and retention/absorptionof water molecules. As a consequence, the relative amount of free water diminishes and theflowability is poorer. The introduction of BFA also led to an increase in setting time, while the resistivityobtained from the impedance measurements tends to be lower than the reference paste (ash-free). Thehigher concentration of mobile species in the pore solution, namely sodium ions introduced by the ash,explains that tendency. The hydration temperature of cement pastes tends to decrease with the level ofcement to ash replacement. Between the two tested ashes (from grate and fluidized sand bed furnaces),differences in particle size and shape, in the amount of residual organic matter and concentration ofinorganic components define minor changes in the workability and setting behaviour. Therefore, theintroduction of biomass fly ashes affects the hardened state features but do not compromise them.",
keywords = "Recycling, Rheological properties, Physical properties, Mechanical testing",
author = "Rejini Rajamma and L Senff and Ribeiro, {M J} and Labrincha, {J A} and Richard Ball and Allen, {G C} and Ferreira, {V M}",
year = "2015",
month = "8",
doi = "10.1016/j.compositesb.2015.03.019",
language = "English",
volume = "77",
pages = "1--9",
journal = "Composites Part B - Engineering",
issn = "1359-8368",
publisher = "Elsevier",

}

TY - JOUR

T1 - Biomass fly ash effect on fresh and hardened state properties of cement based materials

AU - Rajamma,Rejini

AU - Senff,L

AU - Ribeiro,M J

AU - Labrincha,J A

AU - Ball,Richard

AU - Allen,G C

AU - Ferreira,V M

PY - 2015/8

Y1 - 2015/8

N2 - Cement pastes and mortars were prepared by replacing ordinary Portland cement with different dosagesof biomass fly ashes (0, 10, 20 and 30% BFA) whilst in dry condition. The effect of BFA on the flowbehaviour (spread on table and rheology), setting time, temperature of hydration and electrical resistivitywas studied in this experimental research. Increasing the amount of BFA in the compositions requiredextra dosage of water, as a result of particles fineness, tendency for agglomeration and retention/absorptionof water molecules. As a consequence, the relative amount of free water diminishes and theflowability is poorer. The introduction of BFA also led to an increase in setting time, while the resistivityobtained from the impedance measurements tends to be lower than the reference paste (ash-free). Thehigher concentration of mobile species in the pore solution, namely sodium ions introduced by the ash,explains that tendency. The hydration temperature of cement pastes tends to decrease with the level ofcement to ash replacement. Between the two tested ashes (from grate and fluidized sand bed furnaces),differences in particle size and shape, in the amount of residual organic matter and concentration ofinorganic components define minor changes in the workability and setting behaviour. Therefore, theintroduction of biomass fly ashes affects the hardened state features but do not compromise them.

AB - Cement pastes and mortars were prepared by replacing ordinary Portland cement with different dosagesof biomass fly ashes (0, 10, 20 and 30% BFA) whilst in dry condition. The effect of BFA on the flowbehaviour (spread on table and rheology), setting time, temperature of hydration and electrical resistivitywas studied in this experimental research. Increasing the amount of BFA in the compositions requiredextra dosage of water, as a result of particles fineness, tendency for agglomeration and retention/absorptionof water molecules. As a consequence, the relative amount of free water diminishes and theflowability is poorer. The introduction of BFA also led to an increase in setting time, while the resistivityobtained from the impedance measurements tends to be lower than the reference paste (ash-free). Thehigher concentration of mobile species in the pore solution, namely sodium ions introduced by the ash,explains that tendency. The hydration temperature of cement pastes tends to decrease with the level ofcement to ash replacement. Between the two tested ashes (from grate and fluidized sand bed furnaces),differences in particle size and shape, in the amount of residual organic matter and concentration ofinorganic components define minor changes in the workability and setting behaviour. Therefore, theintroduction of biomass fly ashes affects the hardened state features but do not compromise them.

KW - Recycling

KW - Rheological properties

KW - Physical properties

KW - Mechanical testing

UR - http://dx.doi.org/10.1016/j.compositesb.2015.03.019

U2 - 10.1016/j.compositesb.2015.03.019

DO - 10.1016/j.compositesb.2015.03.019

M3 - Article

VL - 77

SP - 1

EP - 9

JO - Composites Part B - Engineering

T2 - Composites Part B - Engineering

JF - Composites Part B - Engineering

SN - 1359-8368

ER -