A state-of-the-art review on the durability of seawater coral aggregate concrete exposed to marine environment. (15th November 2022)

• Record Type: Journal Article
• Authors: Cao, Yinlong; Bao, Jiuwen; Zhang, Peng; Sun, Yanqun; Cui, Yifei
• Is Part Of: Journal of building engineering. Volume 60(2022)
• Publication Date: 2022-11-15
• Subjects: Seawater coral aggregate concrete -- Mechanical properties -- Durability -- FRP bars -- Service life prediction models; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.105199
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: Utilization of coral debris as aggregate for the preparation of seawater coral aggregate concrete (SCAC) can effectively solve the problem of raw materials shortage and reduce energy consumption caused by marine transportation. However, the high porosity and high salt content of coral aggregate significantly affect the long-term mechanical and durability-related performance of concrete structures. The durability of modified SCAC in marine environment as well as the corrosion issue is still a serious threat to the degradation of the reinforced SCAC. Aiming at the widespread application of SCAC in practical engineering, the pre-treatment protocols were proposed to strength the physical properties of coral aggregate in concrete. It is expected that using supplementary cementitious materials, fibers, stainless steel bars and fiber-reinforced polymer (FRP) bars can effectively improve the durability of SCAC, but the related investigations are still limited. Based on this, the current research on the durability of unmodified and modified SCAC under different environmental actions is presented and discussed, and the service life prediction models of reinforced SCAC are further summarized. This paper can be helpful in deeply understanding the deterioration mechanism of SCAC durability and provides a favorable basis for further research on the long-term performance of reinforced SCAC, promoting its application in marine engineering. Highlights: Mechanical and durability-related properties of unmodified SCAC were analyzed. Effect of single and multifactor coupling effect on durability-related properties was introduced. Enhancement effects and detailed mechanism of modified SCAC was discussed. Durability of reinforced SCAC and its service life prediction models were summarized.