Liu, Hao, Chen, Wenlin, Pan, Ruikun, Shan, Zhitao, Qiao, Ang, Drewitt, James W. E., Hennet, Louis, Jahn, Sandro ORCID: 0000-0002-2137-8833, Langstaff, David P., Chass, Gregory A., Tao, Haizheng, Yue, Yuanzheng and Greaves, G. Neville (2020). From Molten Calcium Aluminates through Phase Transitions to Cement Phases. Adv. Sci., 7 (2). HOBOKEN: WILEY. ISSN 2198-3844

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Abstract

Crystalline calcium aluminates are a critical setting agent in cement. To date, few have explored the microscopic and dynamic mechanism of the transitions from molten aluminate liquids, through the supercooled state to glassy and crystalline phases, during cement clinker production. Herein, the first in situ measurements of viscosity and density are reported across all the principal molten phases, relevant to their eventual crystalline structures. Bulk atomistic computer simulations confirm that thermophysical properties scale with the evolution of network substructures interpenetrating melts on the nanoscale. It is demonstrated that the glass transition temperature (T-g) follows the eutectic profile of the liquidus temperature (T-m), coinciding with the melting zone in cement production. The viscosity has been uniquely charted over 14 decades for each calcium-aluminate phase, projecting and justifying the different temperature zones used in cement manufacture. The fragile-strong phase transitions are revealed across all supercooled phases coinciding with heterogeneous nucleation close to 1.2T(g), where sintering and quenching occur in industrial-scale cement processing.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Liu, HaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, WenlinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pan, RuikunUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shan, ZhitaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Qiao, AngUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Drewitt, James W. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hennet, LouisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jahn, SandroUNSPECIFIEDorcid.org/0000-0002-2137-8833UNSPECIFIED
Langstaff, David P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chass, Gregory A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tao, HaizhengUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yue, YuanzhengUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Greaves, G. NevilleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-127118
DOI: 10.1002/advs.201902209
Journal or Publication Title: Adv. Sci.
Volume: 7
Number: 2
Date: 2020
Publisher: WILEY
Place of Publication: HOBOKEN
ISSN: 2198-3844
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
GLASS-FORMING LIQUIDS; X-RAY-ABSORPTION; FICTIVE TEMPERATURE; VISCOSITY; CRYSTALS; FRAGILE; CHARACTERIZE; RELAXATION; MELTS; ALMultiple languages
Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/12711

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