Hydration chemistry of sewage sludge ash used as a cement component

T. D. Dyer; J. E. Halliday; Ravindra Dhir

doi:10.1061/(ASCE)MT.1943-5533.0000221

Hydration chemistry of sewage sludge ash used as a cement component

T. D. Dyer, J. E. Halliday, Ravindra Dhir

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

The hydration chemistry of sewage sludge ashes (SSAs) used as cement components is examined using X-ray diffraction, thermal analysis, and isothermal conduction calorimetry. The presence of SSA leads to the formation of significant quantities of Al2O3-Fe2O3-mono (AFm) phases. Large quantities of amorphous hydration products are also formed. An additional series of small-scale experiments is used to show that it is highly probable that amorphous or poorly crystalline hydroxyapatite (Ca-5(PO4)(3)OH) is generated in addition to calcium silicate hydrate gel. Thus, the reactions of SSA in combination with portland cement cannot be viewed simply as comparable to the pozzolanic or latent hydraulic reactions of other by-product materials used in similar ways. DOI: 10.1061/(ASCE)MT.1943-5533.0000221. (C) 2011 American Society of Civil Engineers.

Original language	English
Pages (from-to)	648-655
Number of pages	8
Journal	Journal of Materials in Civil Engineering
Volume	23
Issue number	5
DOIs	https://doi.org/10.1061/(ASCE)MT.1943-5533.0000221
Publication status	Published - May 2011

Keywords

Sewage sludge ash
Portland cement
Hydration chemistry
RAY-POWDER DIFFRACTOMETER
AXIAL DIVERGENCE
BEHAVIOR
MORTARS
CALCIUM
SSA

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10.1061/(ASCE)MT.1943-5533.0000221

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title = "Hydration chemistry of sewage sludge ash used as a cement component",

abstract = "The hydration chemistry of sewage sludge ashes (SSAs) used as cement components is examined using X-ray diffraction, thermal analysis, and isothermal conduction calorimetry. The presence of SSA leads to the formation of significant quantities of Al2O3-Fe2O3-mono (AFm) phases. Large quantities of amorphous hydration products are also formed. An additional series of small-scale experiments is used to show that it is highly probable that amorphous or poorly crystalline hydroxyapatite (Ca-5(PO4)(3)OH) is generated in addition to calcium silicate hydrate gel. Thus, the reactions of SSA in combination with portland cement cannot be viewed simply as comparable to the pozzolanic or latent hydraulic reactions of other by-product materials used in similar ways. DOI: 10.1061/(ASCE)MT.1943-5533.0000221. (C) 2011 American Society of Civil Engineers.",

keywords = "Sewage sludge ash, Portland cement, Hydration chemistry, RAY-POWDER DIFFRACTOMETER, AXIAL DIVERGENCE, BEHAVIOR, MORTARS, CALCIUM, SSA",

author = "Dyer, {T. D.} and Halliday, {J. E.} and Ravindra Dhir",

year = "2011",

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doi = "10.1061/(ASCE)MT.1943-5533.0000221",

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T1 - Hydration chemistry of sewage sludge ash used as a cement component

AU - Dyer, T. D.

AU - Halliday, J. E.

AU - Dhir, Ravindra

PY - 2011/5

Y1 - 2011/5

N2 - The hydration chemistry of sewage sludge ashes (SSAs) used as cement components is examined using X-ray diffraction, thermal analysis, and isothermal conduction calorimetry. The presence of SSA leads to the formation of significant quantities of Al2O3-Fe2O3-mono (AFm) phases. Large quantities of amorphous hydration products are also formed. An additional series of small-scale experiments is used to show that it is highly probable that amorphous or poorly crystalline hydroxyapatite (Ca-5(PO4)(3)OH) is generated in addition to calcium silicate hydrate gel. Thus, the reactions of SSA in combination with portland cement cannot be viewed simply as comparable to the pozzolanic or latent hydraulic reactions of other by-product materials used in similar ways. DOI: 10.1061/(ASCE)MT.1943-5533.0000221. (C) 2011 American Society of Civil Engineers.

AB - The hydration chemistry of sewage sludge ashes (SSAs) used as cement components is examined using X-ray diffraction, thermal analysis, and isothermal conduction calorimetry. The presence of SSA leads to the formation of significant quantities of Al2O3-Fe2O3-mono (AFm) phases. Large quantities of amorphous hydration products are also formed. An additional series of small-scale experiments is used to show that it is highly probable that amorphous or poorly crystalline hydroxyapatite (Ca-5(PO4)(3)OH) is generated in addition to calcium silicate hydrate gel. Thus, the reactions of SSA in combination with portland cement cannot be viewed simply as comparable to the pozzolanic or latent hydraulic reactions of other by-product materials used in similar ways. DOI: 10.1061/(ASCE)MT.1943-5533.0000221. (C) 2011 American Society of Civil Engineers.

KW - Sewage sludge ash

KW - Portland cement

KW - Hydration chemistry

KW - RAY-POWDER DIFFRACTOMETER

KW - AXIAL DIVERGENCE

KW - BEHAVIOR

KW - MORTARS

KW - CALCIUM

KW - SSA

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DO - 10.1061/(ASCE)MT.1943-5533.0000221

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VL - 23

SP - 648

EP - 655

JO - Journal of Materials in Civil Engineering

JF - Journal of Materials in Civil Engineering

IS - 5

ER -

Hydration chemistry of sewage sludge ash used as a cement component

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Keywords

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