Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/114756
DC FieldValueLanguage
dc.contributorDepartment of Civil and Environmental Engineeringen_US
dc.contributorResearch Centre for Resources Engineering towards Carbon Neutralityen_US
dc.creatorGu, Zen_US
dc.creatorJiang, Len_US
dc.creatorMa, Zen_US
dc.creatorJiang, Yen_US
dc.creatorShen, Pen_US
dc.creatorPoon, CSen_US
dc.date.accessioned2025-08-25T03:43:29Z-
dc.date.available2025-08-25T03:43:29Z-
dc.identifier.issn0958-9465en_US
dc.identifier.urihttp://hdl.handle.net/10397/114756-
dc.language.isoenen_US
dc.publisherPergamon Pressen_US
dc.subjectCarbonationen_US
dc.subjectHyper-gravityen_US
dc.subjectMass transferen_US
dc.subjectRecycled concrete powderen_US
dc.titleAchieving instantaneous activation of recycled concrete powder by hyper-gravity carbonationen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.volume163en_US
dc.identifier.doi10.1016/j.cemconcomp.2025.106177en_US
dcterms.abstractIn this study, a hyper-gravity environment was used for carbonation, aiming at achieving rapid carbonation for activating recycled concrete powder (RCP). The degree of carbonation, mineralogical changes, and microstructural evolution of the RCP during hyper-gravity carbonation (HGC) were monitored and compared with normal carbonation (NC). The results showed that HGC exhibited a carbonation rate 30 times higher than that of NC in 10 min, including the precipitation of 71.1 % calcium carbonate (Cc) and 95.08 % fully polymerized Q4 silicate. In HGC, RCP developed a unique structure characterized by a Cc shell and a silica core. HGC could overcome the gas/solid-liquid limiting steps in NC with its ultra-high mass transfer rates and shear forces, allowing for simultaneous and efficient dissolution and carbonation. The proposed HGC method provides a significant advancement in the joint fields of industrial CO2 capture and waste concrete recycling.en_US
dcterms.accessRightsembargoed accessen_US
dcterms.bibliographicCitationCement and concrete composites, Oct. 2025, v. 163, 106177en_US
dcterms.isPartOfCement and concrete compositesen_US
dcterms.issued2025-10-
dc.identifier.scopus2-s2.0-105008672428-
dc.identifier.eissn1873-393Xen_US
dc.identifier.artn106177en_US
dc.description.validate202508 bcchen_US
dc.description.oaNot applicableen_US
dc.identifier.SubFormIDG000080/2025-07-
dc.description.fundingSourceOthersen_US
dc.description.fundingTextFunding text 1: The authors wish to thank the funding support of the National Natural Science Foundation of China (No. 52308282 ), University Grants Committee (General Research Fund), China Resources Group and the Hong Kong Polytechnic University .; Funding text 2: Fig. 7[Figure presented] illustrates photoelectron spectra in raw/carbonated RCP. As shown in Fig. 7a, the binding energy of the Si 2p peak for raw RCP was approximately 102.1 eV, generally decreasing to 101.8 eV after 10 min of NC. However, after 90 min, it increased to 102.5 eV. The initial decrease in binding energy within 10 min was possibly attributed to the formation of Cc layer on the RCP surface, and the subsequent increase indicated an increased silicate polymerization [69]. As a comparison, in HGC, the binding energy constantly increased from 102.1 eV to 102.4 at 10 min, reaching a peak of 102.8 eV at 40 min. This continuous increase was due to the fast polymerization of silicates. However, the binding energy dropped back to 102.6 eV at 90 min, likely due to the breakdown of RCP particles. This decrease was further supported by the sudden reduction in peak intensity, as an increase in peak intensity implied the accumulation of Si groups on the surface of RCP [25]. The Ca 2p spectra are depicted in Fig. 7b. The peaks between 346 eV and 348eV correspond to Ca 2p3/2. The decreasing binding energy of Ca 2p3/2 during the NC process suggested an increasing calcite electron density around Ca atoms in the surface zone from 0 to 10 min [70]. This implies a slow precipitation of Cc in the early stage of NC. In comparison, in HGC, the calcite electron density around Ca atoms showed a trend of increasing, stabling, and then decreasing from 0 to 2 min, 2\u201340 min and 40\u201390 min, indicating decalcification of Ca-bearing phases, Cc precipitation and RCP breakdown, respectively [71]. The O 1s spectra are shown in Fig. 7c. Each specimen displayed relatively broad peaks around 531.2 eV [71]. The nearly identical peak suggested no significant difference in the chemical state of oxygen in Ca phases between two carbonation methods. In C 1s spectra, the peak around 290 eV was assigned to the carbonate in Cc, while the peak at about 284.8 eV indicated adventitious contamination carbonate [72]. The increased intensity of peaks around 290 eV was associated with the increased amount of Cc from carbonation [58].The authors wish to thank the funding support of the National Natural Science Foundation of China (No. 52308282), University Grants Committee (General Research Fund), China Resources Group and the Hong Kong Polytechnic University.en_US
dc.description.pubStatusPublisheden_US
dc.date.embargo2027-10-31en_US
dc.description.oaCategoryGreen (AAM)en_US
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