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dc.contributor.authorLu, Bingen_US
dc.contributor.authorLi, Hongliangen_US
dc.contributor.authorLi, Mingyangen_US
dc.contributor.authorWong, Teck Nengen_US
dc.contributor.authorQian, Shunzhien_US
dc.identifier.citationLu, B., Li, H., Li, M., Wong, T. N. & Qian, S. (2023). Mechanism and design of fluid catalytic cracking ash-blended cementitious composites for high performance printing. Additive Manufacturing, 61, 103286-.
dc.description.abstractAs a common waste in the oil refinery industry, fluid catalytic cracking (FCC) ash is used to partially replace cement for high-performance high-speed 3D concrete printing (3DCP). Effects of FCC ash on hydration, rheology, and compressive strength were evaluated systematically, and the optimal substitution rate was determined as 20 wt. % of cement. A cylinder with 240 mm diameter and 500 mm height was successfully printed at a high speed of 100 mm/s with the optimal mixture in 5 min 53 s only. Moreover, the optimal mixture shows good leaching performance, and it also reduces CO2 emission by 21.45 % and materials’ cost by 17.98 % compared with the control. In addition to material optimization, the contributions of FCC ash to the early hydration and static yield stress were extensively analyzed. Complementary calorimetric and mineralogical investigations show that FCC ash accelerates the initial hydrolysis of cement and hydration of C3A and C3S. On the other hand, the quantitative analyses of static yield stress reveal the contributions of FCC ash on the colloidal force, volume fractions, particle size distribution, and ultimately static yield stress evolution. The developed 3D printable cementitious material possesses multiple advantages, including high-speed printing compatibility, enhanced sustainability, and high commercial values for oil refinery and construction industries. Based on the mineralogical property of FCC ash, the study also enlightens potential research and application of zeolite in 3D concrete printing in the future.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofAdditive Manufacturingen_US
dc.rights© 2022 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Civil engineeringen_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleMechanism and design of fluid catalytic cracking ash-blended cementitious composites for high performance printingen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.researchSingapore Centre for 3D Printingen_US
dc.subject.keywords3D Concrete Printingen_US
dc.subject.keywordsCementitious Materialen_US
dc.description.acknowledgementThis research is supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Medium-Sized Centre funding scheme, CES_SDC Pte Ltd, and Chip Eng Seng Corporation Ltd. The authors would like to thank ECO Special Waste Management Pte. Ltd., Singapore for providing the FCC ash for this research study.en_US
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