珊瑚骨料混凝土改性技术研究进展

doi:10.11896/cldb.19100116

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Abstract With the development and construction of marine resources, coral aggregate concrete has been widely used on islets and reefs. In recent years, some research results of the basic properties, mechanical properties, and durability of coral aggregate concrete have been obtained. Meanwhile, the preparation technology of coral aggregate concrete has also been continuously optimized. However, because of its unique biological origin, coral sands are usually loose, rough, and irregular in shape, has multiple holes, and are bonded with a variety of salt ions. These characteristics will affect the engineering performance of coral aggregate concrete. Therefore, the researchers mainly tried to optimize the performance of coral aggregate concrete and proposed a variety of improved technologies for coral aggregate concrete.
Although coral aggregate concrete has been in production for a long time, its preparation process has some flaws. For example, the strength of the particles of coral sands is not as good as that of quartz sands, which results in low strength of coral aggregate concrete. Thus, coral aggregate concrete cannot meet stringent engineering requirements. Moreover, high permeability and porosity cause the anti-permeability of coral aggregate concrete to be lower than that of ordinary concrete, which leads to the rapid corrosion and poor durability of internal rebar, affecting the binding ability of the aggregate and reinforcement. Research on the improvement of coral aggregate concrete also focuses on these aspects at home and abroad.
At present, a series of technologies have successfully improved the properties of coral aggregate concrete. In terms of the mechanical properties of coral aggregate concrete, adding fiber, mineral components, and additives, treating coral aggregate with an acid or organic solution, and optimizing the mixing ratio can effectively enhance the strength of coral aggregate concrete. In terms of improving the anti-permeability and corrosion resistance of coral aggregate concrete, using special reinforcement instead of carbon steel, adding rust inhibitor, adopting traditional anti-chlorine corrosion measures, using geopolymer cement, and desalination of coral aggregate are effective methods of enhancing corrosion resis-tance.
On the basis of current research results of coral aggregate concrete at home and abroad, this paper reviews the research progress of its improved technologies. The improvement of the strength of concrete and bonding ability and durability of reinforcement are considered. Then, the future research direction of coral aggregate concrete is discussed to provide a reference for subsequent researchers.

Key words： coral aggregate concrete mechanical properties durability properties enhancement properties

Published: 31 August 2021

CLC number:

TU528

Fund:National Natural Science Foundation of China (51169005,41272358), the Natural Science Foundation of Guangxi, China (2018JJD160019), Graduate Innovation Projects of Guangxi, China (YCSW2019161)

About author:: Yuan Chai, born in 1989, is currently a Ph. D. student at Guangxi University and is conducting research under the guidance of professor Haibo Lyu. At present,the main research field is the coral sand and foundation engineering.
Haibo Lyu, professor of College of Civil and Architectural Engineering in Guilin University of Technology, who is a doctoral supervisor enjoying the he special allowance from the State Council. In July 2002, he gra-duated from Wuhan Institute of Geotechnical Mecha-nics, Chinese Academy of Sciences. In March 2013, he visited Oklahoma State University for research. He is a member of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE), member of the geotechnical committee of the Chinese Society of Mechanics, member of the unsaturated and special soil committee of the Chinese Society of Civil Engineering, member of the underground engineering branch of the Chinese Society of Rock Mechanics and Engineering. His researches have focused on special geotechnical engineering characteristics and applications, unsaturated soil mechanics, soil microstructure and deformation mechanism, concrete damage and testing, calcareous sand engineering mechanical properties.

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Cite this article:

CHAI Yuan,NIU Yong,LI Wenjie, et al. Research Progress on Improved Technology of Coral Aggregate Concrete[J]. Materials Reports, 2021, 35(15): 15134-15142.

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http://www.mater-rep.com/EN/10.11896/cldb.19100116 OR http://www.mater-rep.com/EN/Y2021/V35/I15/15134

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