Characterization of sewage sludge ash and its effect on moisture physics of mortar

Barbora Krejcirikova, Lisbeth M. Ottosen, Gunvor Marie Kirkelund, Carsten Rode, Ruut Hannele Peuhkuri*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A study was carried out to investigate the potential use of ash obtained as an incinerated by-product in sewage sludge treatment, as a possible supplementary cementitious material. Chemical parameters and granulometry of the sewage sludge ash and selected physical and hygroscopic properties of cement-ash-based mortar are presented and compared with results from previous studies. The effect of different ratios of cement substitution and two pre-treatment methods for ash, i.e. ash grinding and water washing, on the physical properties of mortar were investigated by using density, porosity and compressive strength as elemental indicators of the mortar quality. The hygroscopic sorption properties of the individual constituents alone and the resulting mortar samples were described by sorption isotherms for water vapour and by a capillary water absorption test. Results showed that the SSAs typically consisted of larger particles compared to the cement particles. Incorporation of ash resulted in more porous mortar structures compared to cement-based mortar, which affected the material's mechanical properties such as the compressive strength. 28-day compressive strength decreased with increasing ash content and porosity. Cement conveyed the greatest ability to adsorb and react with water and there were clear differences between the different ashes. Despite the differences in sorption properties between the different constituents, the effect of ash content on mortar sorption isotherms was negligible.
Original languageEnglish
JournalJournal of Building Engineering
Volume21
Pages (from-to)396-403
DOIs
Publication statusPublished - 2019

Keywords

  • Sewage sludge ash
  • Supplementary cementitious material (SCM)
  • Grain size distribution
  • Compressive strength
  • Sorptivity

Cite this

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title = "Characterization of sewage sludge ash and its effect on moisture physics of mortar",
abstract = "A study was carried out to investigate the potential use of ash obtained as an incinerated by-product in sewage sludge treatment, as a possible supplementary cementitious material. Chemical parameters and granulometry of the sewage sludge ash and selected physical and hygroscopic properties of cement-ash-based mortar are presented and compared with results from previous studies. The effect of different ratios of cement substitution and two pre-treatment methods for ash, i.e. ash grinding and water washing, on the physical properties of mortar were investigated by using density, porosity and compressive strength as elemental indicators of the mortar quality. The hygroscopic sorption properties of the individual constituents alone and the resulting mortar samples were described by sorption isotherms for water vapour and by a capillary water absorption test. Results showed that the SSAs typically consisted of larger particles compared to the cement particles. Incorporation of ash resulted in more porous mortar structures compared to cement-based mortar, which affected the material's mechanical properties such as the compressive strength. 28-day compressive strength decreased with increasing ash content and porosity. Cement conveyed the greatest ability to adsorb and react with water and there were clear differences between the different ashes. Despite the differences in sorption properties between the different constituents, the effect of ash content on mortar sorption isotherms was negligible.",
keywords = "Sewage sludge ash, Supplementary cementitious material (SCM), Grain size distribution, Compressive strength, Sorptivity",
author = "Barbora Krejcirikova and Ottosen, {Lisbeth M.} and Kirkelund, {Gunvor Marie} and Carsten Rode and Peuhkuri, {Ruut Hannele}",
year = "2019",
doi = "10.1016/j.jobe.2018.10.021",
language = "English",
volume = "21",
pages = "396--403",
journal = "Journal of Building Engineering",
issn = "2352-7102",
publisher = "Elsevier",

}

Characterization of sewage sludge ash and its effect on moisture physics of mortar. / Krejcirikova, Barbora; Ottosen, Lisbeth M.; Kirkelund, Gunvor Marie; Rode, Carsten; Peuhkuri, Ruut Hannele.

In: Journal of Building Engineering, Vol. 21, 2019, p. 396-403.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Characterization of sewage sludge ash and its effect on moisture physics of mortar

AU - Krejcirikova, Barbora

AU - Ottosen, Lisbeth M.

AU - Kirkelund, Gunvor Marie

AU - Rode, Carsten

AU - Peuhkuri, Ruut Hannele

PY - 2019

Y1 - 2019

N2 - A study was carried out to investigate the potential use of ash obtained as an incinerated by-product in sewage sludge treatment, as a possible supplementary cementitious material. Chemical parameters and granulometry of the sewage sludge ash and selected physical and hygroscopic properties of cement-ash-based mortar are presented and compared with results from previous studies. The effect of different ratios of cement substitution and two pre-treatment methods for ash, i.e. ash grinding and water washing, on the physical properties of mortar were investigated by using density, porosity and compressive strength as elemental indicators of the mortar quality. The hygroscopic sorption properties of the individual constituents alone and the resulting mortar samples were described by sorption isotherms for water vapour and by a capillary water absorption test. Results showed that the SSAs typically consisted of larger particles compared to the cement particles. Incorporation of ash resulted in more porous mortar structures compared to cement-based mortar, which affected the material's mechanical properties such as the compressive strength. 28-day compressive strength decreased with increasing ash content and porosity. Cement conveyed the greatest ability to adsorb and react with water and there were clear differences between the different ashes. Despite the differences in sorption properties between the different constituents, the effect of ash content on mortar sorption isotherms was negligible.

AB - A study was carried out to investigate the potential use of ash obtained as an incinerated by-product in sewage sludge treatment, as a possible supplementary cementitious material. Chemical parameters and granulometry of the sewage sludge ash and selected physical and hygroscopic properties of cement-ash-based mortar are presented and compared with results from previous studies. The effect of different ratios of cement substitution and two pre-treatment methods for ash, i.e. ash grinding and water washing, on the physical properties of mortar were investigated by using density, porosity and compressive strength as elemental indicators of the mortar quality. The hygroscopic sorption properties of the individual constituents alone and the resulting mortar samples were described by sorption isotherms for water vapour and by a capillary water absorption test. Results showed that the SSAs typically consisted of larger particles compared to the cement particles. Incorporation of ash resulted in more porous mortar structures compared to cement-based mortar, which affected the material's mechanical properties such as the compressive strength. 28-day compressive strength decreased with increasing ash content and porosity. Cement conveyed the greatest ability to adsorb and react with water and there were clear differences between the different ashes. Despite the differences in sorption properties between the different constituents, the effect of ash content on mortar sorption isotherms was negligible.

KW - Sewage sludge ash

KW - Supplementary cementitious material (SCM)

KW - Grain size distribution

KW - Compressive strength

KW - Sorptivity

U2 - 10.1016/j.jobe.2018.10.021

DO - 10.1016/j.jobe.2018.10.021

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