Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakener
This paper proposed a dormancy—awakening method for the collection and recycling of waste fresh paste (WFP), generated from waste fresh concrete from concrete mixing plant. Sodium citrate was employed to put WFP into the state of dormancy with low rates of cement hydration; whereas gaseous CO2 was i...
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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/S2214509525002323 |
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| author | Peiyuan Chen Zijian Zong Xinliang Qian Yi Fang Jin Li Liping Wang Jialai Wang |
| author_facet | Peiyuan Chen Zijian Zong Xinliang Qian Yi Fang Jin Li Liping Wang Jialai Wang |
| author_sort | Peiyuan Chen |
| collection | DOAJ |
| description | This paper proposed a dormancy—awakening method for the collection and recycling of waste fresh paste (WFP), generated from waste fresh concrete from concrete mixing plant. Sodium citrate was employed to put WFP into the state of dormancy with low rates of cement hydration; whereas gaseous CO2 was injected, serving as an awakener for the dormant WFP. Experimental results demonstrated that sodium citrate treatment effectively impeded the cement hydration of WFP, allowing a sufficient operational time for further accumulation and centralized processing. CO2 injection facilitated the in-situ generation of fine-sized CaCO3 within dormant concrete, providing nucleation sites for accelerated hydration of cement. Application of CO2 injection for 45 mins or 60 mins resulted in the restoration of 28d compressive strength of WFP to 99 % and 96 % of the blank mixture without dormancy treatment. This approach not only awakens dormant WFP through the in-situ generation of fine-sized CaCO3, but also achieves carbon sequestration, offering a sustainable and practical solution for recycling WFP and promoting eco-friendly construction practices. |
| format | Article |
| id | doaj-art-c2c1b85e9e494b0e9b233e7321f5f45d |
| institution | DOAJ |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-c2c1b85e9e494b0e9b233e7321f5f45d2025-08-20T03:05:06ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e0443410.1016/j.cscm.2025.e04434Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakenerPeiyuan Chen0Zijian Zong1Xinliang Qian2Yi Fang3Jin Li4Liping Wang5Jialai Wang6School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; Department of Engineering Science, Faculty of Innovation Engineering, Macau University of Science and Technology, 999078, Macao; Corresponding author at: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China.College of Mechanics and Materials, Hohai University, Nanjing, Jiangsu 211100, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, ChinaDepartment of Civil, Construction, and Environmental Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA; Corresponding author.This paper proposed a dormancy—awakening method for the collection and recycling of waste fresh paste (WFP), generated from waste fresh concrete from concrete mixing plant. Sodium citrate was employed to put WFP into the state of dormancy with low rates of cement hydration; whereas gaseous CO2 was injected, serving as an awakener for the dormant WFP. Experimental results demonstrated that sodium citrate treatment effectively impeded the cement hydration of WFP, allowing a sufficient operational time for further accumulation and centralized processing. CO2 injection facilitated the in-situ generation of fine-sized CaCO3 within dormant concrete, providing nucleation sites for accelerated hydration of cement. Application of CO2 injection for 45 mins or 60 mins resulted in the restoration of 28d compressive strength of WFP to 99 % and 96 % of the blank mixture without dormancy treatment. This approach not only awakens dormant WFP through the in-situ generation of fine-sized CaCO3, but also achieves carbon sequestration, offering a sustainable and practical solution for recycling WFP and promoting eco-friendly construction practices.http://www.sciencedirect.com/science/article/pii/S2214509525002323Waste fresh concreteDormancyAwakeningCarbon dioxideCompressive strength |
| spellingShingle | Peiyuan Chen Zijian Zong Xinliang Qian Yi Fang Jin Li Liping Wang Jialai Wang Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakener Case Studies in Construction Materials Waste fresh concrete Dormancy Awakening Carbon dioxide Compressive strength |
| title | Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakener |
| title_full | Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakener |
| title_fullStr | Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakener |
| title_full_unstemmed | Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakener |
| title_short | Recycling waste fresh paste through a dormancy—awakening method using CO2 as the awakener |
| title_sort | recycling waste fresh paste through a dormancy awakening method using co2 as the awakener |
| topic | Waste fresh concrete Dormancy Awakening Carbon dioxide Compressive strength |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525002323 |
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