Determination of hygrothermal properties of cementitious mortar: The effect of partial replacement of cement by incinerated sewage sludge ash

Barbora Krejcirikova, Carsten Rode*, Ruut Hannele Peuhkuri

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Two sewage sludge ashes were used as substitutes for cement and their effect on the hygrothermal properties of mortar was examined. Different cement to ash ratios and two ash pre-treatment methods (water washing and grinding) were in focus. The impact of cement replacement by sewage sludge ashes on thermal conductivity, sorption isotherms, water vapour permeability and carbonation was described with standard cement-based mortar as the reference material. Measurement results showed that thermal conductivity decreased by 15% when 30% of the cement was replaced by sewage sludge ash. Water vapour permeability increased as the cement to ash ratio was reduced. Sorption was tested by two methods; although differences in the sorption isotherms of mortars were reported when a climatic chamber method was applied, no differences, or only minor differences, were observed with the desiccator method. Measurements revealed that cement-based mortar possessed a higher content of carbonate than cement-ash-based mortar, and it thus appears that the carbonation rate was higher when the cement content was high.
Original languageEnglish
JournalJournal of Building Physics
Volume42
Issue number6
Pages (from-to)771-787
Number of pages17
ISSN1744-2591
DOIs
Publication statusPublished - 2019

Keywords

  • Sewage sludge ash
  • Supplemantary cementitious material (SCM)
  • thermal conductivity
  • Sorption
  • Water vapour permeability
  • Carbonation

Cite this

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title = "Determination of hygrothermal properties of cementitious mortar: The effect of partial replacement of cement by incinerated sewage sludge ash",
abstract = "Two sewage sludge ashes were used as substitutes for cement and their effect on the hygrothermal properties of mortar was examined. Different cement to ash ratios and two ash pre-treatment methods (water washing and grinding) were in focus. The impact of cement replacement by sewage sludge ashes on thermal conductivity, sorption isotherms, water vapour permeability and carbonation was described with standard cement-based mortar as the reference material. Measurement results showed that thermal conductivity decreased by 15{\%} when 30{\%} of the cement was replaced by sewage sludge ash. Water vapour permeability increased as the cement to ash ratio was reduced. Sorption was tested by two methods; although differences in the sorption isotherms of mortars were reported when a climatic chamber method was applied, no differences, or only minor differences, were observed with the desiccator method. Measurements revealed that cement-based mortar possessed a higher content of carbonate than cement-ash-based mortar, and it thus appears that the carbonation rate was higher when the cement content was high.",
keywords = "Sewage sludge ash, Supplemantary cementitious material (SCM), thermal conductivity, Sorption, Water vapour permeability, Carbonation",
author = "Barbora Krejcirikova and Carsten Rode and Peuhkuri, {Ruut Hannele}",
year = "2019",
doi = "10.1177/1744259118791202",
language = "English",
volume = "42",
pages = "771--787",
journal = "Journal of Building Physics",
issn = "1744-2591",
publisher = "SAGE Publications",
number = "6",

}

Determination of hygrothermal properties of cementitious mortar: The effect of partial replacement of cement by incinerated sewage sludge ash. / Krejcirikova, Barbora; Rode, Carsten; Peuhkuri, Ruut Hannele.

In: Journal of Building Physics, Vol. 42, No. 6, 2019, p. 771-787.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Determination of hygrothermal properties of cementitious mortar: The effect of partial replacement of cement by incinerated sewage sludge ash

AU - Krejcirikova, Barbora

AU - Rode, Carsten

AU - Peuhkuri, Ruut Hannele

PY - 2019

Y1 - 2019

N2 - Two sewage sludge ashes were used as substitutes for cement and their effect on the hygrothermal properties of mortar was examined. Different cement to ash ratios and two ash pre-treatment methods (water washing and grinding) were in focus. The impact of cement replacement by sewage sludge ashes on thermal conductivity, sorption isotherms, water vapour permeability and carbonation was described with standard cement-based mortar as the reference material. Measurement results showed that thermal conductivity decreased by 15% when 30% of the cement was replaced by sewage sludge ash. Water vapour permeability increased as the cement to ash ratio was reduced. Sorption was tested by two methods; although differences in the sorption isotherms of mortars were reported when a climatic chamber method was applied, no differences, or only minor differences, were observed with the desiccator method. Measurements revealed that cement-based mortar possessed a higher content of carbonate than cement-ash-based mortar, and it thus appears that the carbonation rate was higher when the cement content was high.

AB - Two sewage sludge ashes were used as substitutes for cement and their effect on the hygrothermal properties of mortar was examined. Different cement to ash ratios and two ash pre-treatment methods (water washing and grinding) were in focus. The impact of cement replacement by sewage sludge ashes on thermal conductivity, sorption isotherms, water vapour permeability and carbonation was described with standard cement-based mortar as the reference material. Measurement results showed that thermal conductivity decreased by 15% when 30% of the cement was replaced by sewage sludge ash. Water vapour permeability increased as the cement to ash ratio was reduced. Sorption was tested by two methods; although differences in the sorption isotherms of mortars were reported when a climatic chamber method was applied, no differences, or only minor differences, were observed with the desiccator method. Measurements revealed that cement-based mortar possessed a higher content of carbonate than cement-ash-based mortar, and it thus appears that the carbonation rate was higher when the cement content was high.

KW - Sewage sludge ash

KW - Supplemantary cementitious material (SCM)

KW - thermal conductivity

KW - Sorption

KW - Water vapour permeability

KW - Carbonation

U2 - 10.1177/1744259118791202

DO - 10.1177/1744259118791202

M3 - Journal article

VL - 42

SP - 771

EP - 787

JO - Journal of Building Physics

JF - Journal of Building Physics

SN - 1744-2591

IS - 6

ER -