Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfill
This paper aims to enhance the effective utilization of construction solid waste renewable brick powder (RBP) and circulating fluidized bed fly ash (CFBFA), addressing the issues of resource consumption and environmental pollution associated with these two types of solid waste. It employs CFBFA to s...
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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/S2214509525000828 |
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| author | Wenhuan Liu Kaize Li Xiaoyu Jiao Hui Li Honghong Cao Yongping Qu |
| author_facet | Wenhuan Liu Kaize Li Xiaoyu Jiao Hui Li Honghong Cao Yongping Qu |
| author_sort | Wenhuan Liu |
| collection | DOAJ |
| description | This paper aims to enhance the effective utilization of construction solid waste renewable brick powder (RBP) and circulating fluidized bed fly ash (CFBFA), addressing the issues of resource consumption and environmental pollution associated with these two types of solid waste. It employs CFBFA to synergistically activate RBP for the preparation of solid waste-based earthwork subgrade backfill. This research examines the impact of RBP and CFBFA content on the performance of earthwork subgrade backfill (ESB), while the microstructure of the paste test block was investigated using XRD, SEM, FTIR, and TG-dTG techniques. The synergistic mechanism of multi-solid waste was examined at the micro level, and the appropriate ratio of solid waste-derived low-carbon ESB was thoroughly assessed. The findings indicate that an increase in the CFBFA content generally enhances the mechanical strength of the paste. At the experimental ratio of RBP: CFBFA: coarse-grained soil = 8: 32: 60, the 28-day unconfined compressive strength (UCS), California Bearing Ratio (CBR) value, rebound modulus value, shear strength value, and compression modulus value of the sample attain their maximums, measuring 5.3 MPa, 41.9 %, 71.9 MPa, 10.5 KPa, and 15.76 MPa, respectively, all exceeding the standard values. The hydration products of cementitious materials based on RBP and CFBFA mostly consist of C-S-H gel, ettringite (AFt), and calcite. The robust honeycomb gel structure, created by the staggered interconnection of C-S-H gel and ettringite, is the primary contributor to mechanical strength. The modified cementitious material, composed of RBP-CFBFA, exhibits effective cementation and solidification properties for heavy metals, achieving leaching concentrations that comply with Class III water standards as outlined in the Chinese standard GB/T 14848–2017. |
| format | Article |
| id | doaj-art-fb6154b2634845b29806312064fa9a28 |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-fb6154b2634845b29806312064fa9a282025-01-21T04:13:07ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04283Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfillWenhuan Liu0Kaize Li1Xiaoyu Jiao2Hui Li3Honghong Cao4Yongping Qu5College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China; Ecological Cement Engineering Research Center of Ministry of Education, Xi’an, Shaanxi 710055,ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China; Ecological Cement Engineering Research Center of Ministry of Education, Xi’an, Shaanxi 710055,China; Corresponding author at: College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China.College of Materials Science and Engineering, North University of China, Tianyuan, Shanxi 030051, ChinaCollege of Materials Science and Engineering, North University of China, Tianyuan, Shanxi 030051, ChinaThis paper aims to enhance the effective utilization of construction solid waste renewable brick powder (RBP) and circulating fluidized bed fly ash (CFBFA), addressing the issues of resource consumption and environmental pollution associated with these two types of solid waste. It employs CFBFA to synergistically activate RBP for the preparation of solid waste-based earthwork subgrade backfill. This research examines the impact of RBP and CFBFA content on the performance of earthwork subgrade backfill (ESB), while the microstructure of the paste test block was investigated using XRD, SEM, FTIR, and TG-dTG techniques. The synergistic mechanism of multi-solid waste was examined at the micro level, and the appropriate ratio of solid waste-derived low-carbon ESB was thoroughly assessed. The findings indicate that an increase in the CFBFA content generally enhances the mechanical strength of the paste. At the experimental ratio of RBP: CFBFA: coarse-grained soil = 8: 32: 60, the 28-day unconfined compressive strength (UCS), California Bearing Ratio (CBR) value, rebound modulus value, shear strength value, and compression modulus value of the sample attain their maximums, measuring 5.3 MPa, 41.9 %, 71.9 MPa, 10.5 KPa, and 15.76 MPa, respectively, all exceeding the standard values. The hydration products of cementitious materials based on RBP and CFBFA mostly consist of C-S-H gel, ettringite (AFt), and calcite. The robust honeycomb gel structure, created by the staggered interconnection of C-S-H gel and ettringite, is the primary contributor to mechanical strength. The modified cementitious material, composed of RBP-CFBFA, exhibits effective cementation and solidification properties for heavy metals, achieving leaching concentrations that comply with Class III water standards as outlined in the Chinese standard GB/T 14848–2017.http://www.sciencedirect.com/science/article/pii/S2214509525000828Recycled brick powderCirculating fluidized bed fly ashEarthwork subgrade backfillMechanical propertiesHydration characteristics |
| spellingShingle | Wenhuan Liu Kaize Li Xiaoyu Jiao Hui Li Honghong Cao Yongping Qu Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfill Case Studies in Construction Materials Recycled brick powder Circulating fluidized bed fly ash Earthwork subgrade backfill Mechanical properties Hydration characteristics |
| title | Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfill |
| title_full | Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfill |
| title_fullStr | Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfill |
| title_full_unstemmed | Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfill |
| title_short | Innovative development, microstructure and hydration characteristics of recycled brick powder-circulating fluidized bed fly ash-based earthwork subgrade backfill |
| title_sort | innovative development microstructure and hydration characteristics of recycled brick powder circulating fluidized bed fly ash based earthwork subgrade backfill |
| topic | Recycled brick powder Circulating fluidized bed fly ash Earthwork subgrade backfill Mechanical properties Hydration characteristics |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525000828 |
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