Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly Aggregates
In this study, iron ore tailings (IOTs) are used as aggregates to prepare iron-ore-tailing-engineered cementitious composites (IOT-ECCs) to achieve clean production. Some mechanical indexes, such as compressive strength (<i>f<sub>cu</sub></i>), four-point flexural strength (&...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/5/1341 |
| _version_ | 1797600788766261248 |
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| author | Kangning Liu Sheliang Wang Xiaoyi Quan Jing Wu Jin Xu Nan Zhao Bo Liu |
| author_facet | Kangning Liu Sheliang Wang Xiaoyi Quan Jing Wu Jin Xu Nan Zhao Bo Liu |
| author_sort | Kangning Liu |
| collection | DOAJ |
| description | In this study, iron ore tailings (IOTs) are used as aggregates to prepare iron-ore-tailing-engineered cementitious composites (IOT-ECCs) to achieve clean production. Some mechanical indexes, such as compressive strength (<i>f<sub>cu</sub></i>), four-point flexural strength (<i>f<sub>f</sub></i>), axial compressive strength (<i>f<sub>c</sub></i>), deformation properties, flexural toughness, and stress–strain behavior, are studied. The mass loss, <i>f<sub>cu</sub></i> loss, relative dynamic modulus elasticity (RDEM), and deterioration mechanism after the sulfate freeze–thaw (F-T) cycle are discussed in detail. In addition, pore structure analysis is performed using nuclear magnetic resonance (NMR), while a scanning electron microscope (SEM) is utilized to study the micro-morphology. The results showed that under the 20–80% IOT replacement ratio, IOT-ECCs exhibited improvements in their mechanical properties, pore structure, and resistance to sulfate freeze–thaw (F-T). The most notable mechanical properties and sulfate F-T resistance were demonstrated by the IOT-ECC with 40% IOTs (namely, IOT40-P2.0). Meanwhile, IOT40-P2.0 exhibited good pore structure as well as the bonding interface of the PF and the matrix. The pore structure and compactness of the matrix of IOT-ECCs gradually deteriorated as the F-T cycle increased. The research results will promote the application of IOTs in ECCs. |
| first_indexed | 2024-03-11T03:52:53Z |
| format | Article |
| id | doaj.art-92564caff3354c4cb4403de176d60fd2 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-11T03:52:53Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-92564caff3354c4cb4403de176d60fd22023-11-18T00:46:54ZengMDPI AGBuildings2075-53092023-05-01135134110.3390/buildings13051341Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly AggregatesKangning Liu0Sheliang Wang1Xiaoyi Quan2Jing Wu3Jin Xu4Nan Zhao5Bo Liu6School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaChina Railway 20th Bureau Group Co., Ltd., Xi’an 710016, ChinaIn this study, iron ore tailings (IOTs) are used as aggregates to prepare iron-ore-tailing-engineered cementitious composites (IOT-ECCs) to achieve clean production. Some mechanical indexes, such as compressive strength (<i>f<sub>cu</sub></i>), four-point flexural strength (<i>f<sub>f</sub></i>), axial compressive strength (<i>f<sub>c</sub></i>), deformation properties, flexural toughness, and stress–strain behavior, are studied. The mass loss, <i>f<sub>cu</sub></i> loss, relative dynamic modulus elasticity (RDEM), and deterioration mechanism after the sulfate freeze–thaw (F-T) cycle are discussed in detail. In addition, pore structure analysis is performed using nuclear magnetic resonance (NMR), while a scanning electron microscope (SEM) is utilized to study the micro-morphology. The results showed that under the 20–80% IOT replacement ratio, IOT-ECCs exhibited improvements in their mechanical properties, pore structure, and resistance to sulfate freeze–thaw (F-T). The most notable mechanical properties and sulfate F-T resistance were demonstrated by the IOT-ECC with 40% IOTs (namely, IOT40-P2.0). Meanwhile, IOT40-P2.0 exhibited good pore structure as well as the bonding interface of the PF and the matrix. The pore structure and compactness of the matrix of IOT-ECCs gradually deteriorated as the F-T cycle increased. The research results will promote the application of IOTs in ECCs.https://www.mdpi.com/2075-5309/13/5/1341iron ore tailingsengineered cementitious compositesmechanical propertiessulfate freeze–thaw cycle resistancepore structuremicroscope characteristics |
| spellingShingle | Kangning Liu Sheliang Wang Xiaoyi Quan Jing Wu Jin Xu Nan Zhao Bo Liu Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly Aggregates Buildings iron ore tailings engineered cementitious composites mechanical properties sulfate freeze–thaw cycle resistance pore structure microscope characteristics |
| title | Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly Aggregates |
| title_full | Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly Aggregates |
| title_fullStr | Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly Aggregates |
| title_full_unstemmed | Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly Aggregates |
| title_short | Development of Engineered Cementitious Composites (ECCs) Incorporating Iron Ore Tailings as Eco-Friendly Aggregates |
| title_sort | development of engineered cementitious composites eccs incorporating iron ore tailings as eco friendly aggregates |
| topic | iron ore tailings engineered cementitious composites mechanical properties sulfate freeze–thaw cycle resistance pore structure microscope characteristics |
| url | https://www.mdpi.com/2075-5309/13/5/1341 |
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