Enhancing the performance of basic magnesium sulfate cement-based coral aggregate concrete through gradient composite design technology

Chu, Yingjie and Wang, Aiguo and Zhu, Yingcan ORCID: https://orcid.org/0000-0003-4087-0169 and Wang, Hao and Liu, Kaiwei and Ma, Rui and Guo, Liping and Sun, Daosheng (2021) Enhancing the performance of basic magnesium sulfate cement-based coral aggregate concrete through gradient composite design technology. Composites Part B: Engineering, 227:109382. pp. 1-13. ISSN 1359-8368


Abstract

The porous nature of coral aggregate challenges the manufacturing of high performance coral concrete, which obstacles its development and application. By using gradient composite design technology, this study reports an environmentally friendly and economical method to modify coral aggregates. This improvement can overcome the technical bottleneck of manufacturing high performance coral concrete. Innovatively, citric acid was used to clean coral aggregate particles, and basic magnesium sulfate cement (BMSC) was used to coat coral aggregates. Subsequently, BMSC was used as binder to manufacture the high performance coral aggregate concrete. The acid cleaning removed loose attachments and soft layer on the surface of coral aggregates. It enhanced the filling effect of BMSC coating into pores and improved the interfacial bonding between the coral aggregate surface and the cement coating. The gradient composite design technology modified the interfacial transition zone of coral concrete, successfully solved the problem of poor interface between coral aggregates and mortar. Comparing to the concrete prepared with original coral aggregates, the concrete prepared using the proposed new method improved workability by 35.3%, flexural strength by 20.5% and compressive strength by 31.8%, and significantly reduced capillary water absorption.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 07 Mar 2022 05:03
Last Modified: 07 Mar 2022 05:03
Uncontrolled Keywords: Acid cleaning; Basic magnesium sulfate cement; Coral concrete; Interface structure; Mechanical properties
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0911 Maritime Engineering > 091101 Marine Engineering
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials
Socio-Economic Objectives (2008): B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Socio-Economic Objectives (2020): 12 CONSTRUCTION > 1203 Construction materials performance and processes > 120301 Cement and concrete materials
Identification Number or DOI: https://doi.org/10.1016/j.compositesb.2021.109382
URI: http://eprints.usq.edu.au/id/eprint/47028

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