Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment
Landfilled coal ash (LA) may serve as an alternative to fly coal ash (FA) as a stable and abundant supplementary cementitious material (SCM), particularly given the gradual phasing out of coal-fired power plants in many developed regions. This study investigates the physicochemical properties of fre...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525006151 |
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| author | Luchang Xiong Olga Maltseva Ana Fernández-Jiménez Zhijun Wan Angel Palomo |
| author_facet | Luchang Xiong Olga Maltseva Ana Fernández-Jiménez Zhijun Wan Angel Palomo |
| author_sort | Luchang Xiong |
| collection | DOAJ |
| description | Landfilled coal ash (LA) may serve as an alternative to fly coal ash (FA) as a stable and abundant supplementary cementitious material (SCM), particularly given the gradual phasing out of coal-fired power plants in many developed regions. This study investigates the physicochemical properties of fresh FA, original LA (OLA), mechanochemically activated LA (GLA), and negative-pressure sieved LA (SLA). Additionally, it evaluates the potential activity of LA and the fundamental properties of LA-based blended cements produced with different pretreatment methods. The results show that long-term landfilling significantly reduces LA activity. The primary causes of this deterioration are macroscopic impurity contamination and microscopic partial reactions. Both mechanochemical activation and negative-pressure sieving pretreatments can improve LA activity and optimize the fundamental properties of LA-based blended cements through particle modification and particle selection, respectively. Owing to their distinct mechanisms for improving activity, blended mortars prepared with GLA exhibit improved water demand and strength performance compared to those made with SLA. This study contributes to the theoretical foundation for the resource utilization of landfilled coal ash, and provides potential option for pozzolanic materials in thermal coal plant closing areas. |
| format | Article |
| id | doaj-art-b1c82ef23bbe4cd4901ab52b25f84879 |
| institution | OA Journals |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-b1c82ef23bbe4cd4901ab52b25f848792025-08-20T02:34:53ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e0481710.1016/j.cscm.2025.e04817Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatmentLuchang Xiong0Olga Maltseva1Ana Fernández-Jiménez2Zhijun Wan3Angel Palomo4School of Mines, China University of Mining & Technology, Xuzhou 221116, China; Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC), Madrid 28033, Spain; Corresponding author at: School of Mines, China University of Mining and Technology, Xuzhou 221116, China.Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC), Madrid 28033, SpainInstituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC), Madrid 28033, SpainSchool of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaInstituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC), Madrid 28033, Spain; Corresponding author.Landfilled coal ash (LA) may serve as an alternative to fly coal ash (FA) as a stable and abundant supplementary cementitious material (SCM), particularly given the gradual phasing out of coal-fired power plants in many developed regions. This study investigates the physicochemical properties of fresh FA, original LA (OLA), mechanochemically activated LA (GLA), and negative-pressure sieved LA (SLA). Additionally, it evaluates the potential activity of LA and the fundamental properties of LA-based blended cements produced with different pretreatment methods. The results show that long-term landfilling significantly reduces LA activity. The primary causes of this deterioration are macroscopic impurity contamination and microscopic partial reactions. Both mechanochemical activation and negative-pressure sieving pretreatments can improve LA activity and optimize the fundamental properties of LA-based blended cements through particle modification and particle selection, respectively. Owing to their distinct mechanisms for improving activity, blended mortars prepared with GLA exhibit improved water demand and strength performance compared to those made with SLA. This study contributes to the theoretical foundation for the resource utilization of landfilled coal ash, and provides potential option for pozzolanic materials in thermal coal plant closing areas.http://www.sciencedirect.com/science/article/pii/S2214509525006151Deterioration mechanismActivityLandfilled coal ashFly ashMechanochemical activation |
| spellingShingle | Luchang Xiong Olga Maltseva Ana Fernández-Jiménez Zhijun Wan Angel Palomo Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment Case Studies in Construction Materials Deterioration mechanism Activity Landfilled coal ash Fly ash Mechanochemical activation |
| title | Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment |
| title_full | Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment |
| title_fullStr | Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment |
| title_full_unstemmed | Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment |
| title_short | Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment |
| title_sort | mechanism for activity variation of landfilled coal ash deterioration in landfilling and improvement in pretreatment |
| topic | Deterioration mechanism Activity Landfilled coal ash Fly ash Mechanochemical activation |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525006151 |
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