Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases

Rui XIAO; Qingke NIE; Junxi HE; Hang LU; Zhenglai SHEN; Baoshan HUANG

doi:10.1016/j.jclepro.2022.133320

Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases

Rui XIAO
, Qingke NIE
, Junxi HE
, Hang LU
, Zhenglai SHEN
, Baoshan HUANG^*

^*Corresponding author for this work

Research output: Journal Publications › Journal Article (refereed) › peer-review

40 Citations (Scopus)

Abstract

This study explored the feasibility of utilizing lowly-reactive coal gasification fly ash (CGFA) for stabilizing road aggregate bases. Three types of aggregate stabilizers including the ordinary Portland cement (OPC)-CGFA, hydrated lime (CH)-CGFA and alkali-activated CH-CGFA were evaluated based on the performances of compacted base specimens. It was found that the OPC-CGFA stabilized bases showed better mechanical and durability properties while the CH-CGFA samples had low water stability and freeze-thaw durability due to the dissolution of unreacted CH. However, the reaction degree of CGFA associated with the performances of CH-CGFA stabilization could be considerably enhanced by the alkali-activation. The sustainability and economic feasibility analyses showed the use of CGFA could significantly reduce the CO₂ emissions and costs, highlighting the synergy between the recycling of CGFA and the construction of sustainable road bases. A framework of selecting CGFA-based stabilizers for road bases was proposed considering the performance ratings of the material properties.

Original language	English
Article number	133320
Number of pages	15
Journal	Journal of Cleaner Production
Volume	370
Early online date	5 Aug 2022
DOIs	https://doi.org/10.1016/j.jclepro.2022.133320
Publication status	Published - 10 Oct 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

Funding

This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 13 Climate Action

Keywords

Coal gasification fly ash (CGFA)
Cement-treated base (CTB)
Supplementary cementitious materials (SCMs)
Alkali-activated materials (AAMs)
Water stability

Access to Document

10.1016/j.jclepro.2022.133320

Cite this

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title = "Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases",

abstract = "This study explored the feasibility of utilizing lowly-reactive coal gasification fly ash (CGFA) for stabilizing road aggregate bases. Three types of aggregate stabilizers including the ordinary Portland cement (OPC)-CGFA, hydrated lime (CH)-CGFA and alkali-activated CH-CGFA were evaluated based on the performances of compacted base specimens. It was found that the OPC-CGFA stabilized bases showed better mechanical and durability properties while the CH-CGFA samples had low water stability and freeze-thaw durability due to the dissolution of unreacted CH. However, the reaction degree of CGFA associated with the performances of CH-CGFA stabilization could be considerably enhanced by the alkali-activation. The sustainability and economic feasibility analyses showed the use of CGFA could significantly reduce the CO2 emissions and costs, highlighting the synergy between the recycling of CGFA and the construction of sustainable road bases. A framework of selecting CGFA-based stabilizers for road bases was proposed considering the performance ratings of the material properties.",

keywords = "Coal gasification fly ash (CGFA), Cement-treated base (CTB), Supplementary cementitious materials (SCMs), Alkali-activated materials (AAMs), Water stability",

author = "Rui XIAO and Qingke NIE and Junxi HE and Hang LU and Zhenglai SHEN and Baoshan HUANG",

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year = "2022",

month = oct,

day = "10",

doi = "10.1016/j.jclepro.2022.133320",

language = "English",

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T1 - Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases

AU - XIAO, Rui

AU - NIE, Qingke

AU - HE, Junxi

AU - LU, Hang

AU - SHEN, Zhenglai

AU - HUANG, Baoshan

PY - 2022/10/10

Y1 - 2022/10/10

N2 - This study explored the feasibility of utilizing lowly-reactive coal gasification fly ash (CGFA) for stabilizing road aggregate bases. Three types of aggregate stabilizers including the ordinary Portland cement (OPC)-CGFA, hydrated lime (CH)-CGFA and alkali-activated CH-CGFA were evaluated based on the performances of compacted base specimens. It was found that the OPC-CGFA stabilized bases showed better mechanical and durability properties while the CH-CGFA samples had low water stability and freeze-thaw durability due to the dissolution of unreacted CH. However, the reaction degree of CGFA associated with the performances of CH-CGFA stabilization could be considerably enhanced by the alkali-activation. The sustainability and economic feasibility analyses showed the use of CGFA could significantly reduce the CO2 emissions and costs, highlighting the synergy between the recycling of CGFA and the construction of sustainable road bases. A framework of selecting CGFA-based stabilizers for road bases was proposed considering the performance ratings of the material properties.

AB - This study explored the feasibility of utilizing lowly-reactive coal gasification fly ash (CGFA) for stabilizing road aggregate bases. Three types of aggregate stabilizers including the ordinary Portland cement (OPC)-CGFA, hydrated lime (CH)-CGFA and alkali-activated CH-CGFA were evaluated based on the performances of compacted base specimens. It was found that the OPC-CGFA stabilized bases showed better mechanical and durability properties while the CH-CGFA samples had low water stability and freeze-thaw durability due to the dissolution of unreacted CH. However, the reaction degree of CGFA associated with the performances of CH-CGFA stabilization could be considerably enhanced by the alkali-activation. The sustainability and economic feasibility analyses showed the use of CGFA could significantly reduce the CO2 emissions and costs, highlighting the synergy between the recycling of CGFA and the construction of sustainable road bases. A framework of selecting CGFA-based stabilizers for road bases was proposed considering the performance ratings of the material properties.

KW - Coal gasification fly ash (CGFA)

KW - Cement-treated base (CTB)

KW - Supplementary cementitious materials (SCMs)

KW - Alkali-activated materials (AAMs)

KW - Water stability

UR - https://www.scopus.com/pages/publications/85136181988

U2 - 10.1016/j.jclepro.2022.133320

DO - 10.1016/j.jclepro.2022.133320

M3 - Journal Article (refereed)

AN - SCOPUS:85136181988

SN - 0959-6526

VL - 370

JO - Journal of Cleaner Production

JF - Journal of Cleaner Production

M1 - 133320

ER -

Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases

Abstract

Bibliographical note

Funding

UN SDGs

Keywords

Access to Document

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