Effects of nano-silica and reactive magnesia on the microstructure and durability performance of underwater concrete

Non-dispersible underwater concrete is a kind of construction material which is seeking its growing application in the offshore structures. However, the offshore structures are exposed to aggressive environment and harmful ions. Therefore, this study is conducted to investigate the mechanical, physi...

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Bibliographic Details
Published in:Powder technology 2022-01, Vol.398, p.116976, Article 116976
Main Authors: Jeon, In Kyu, Qudoos, Abdul, Woo, Byeong Hun, Yoo, Dong Ho, Kim, Hong Gi
Format: Article
Language:English
Subjects:
Carbonation
Chloride penetration
Chloride resistance
Chlorides
Compressive strength
Concrete
Construction materials
Durability
Magnesium oxide
Mercury
MgO
Microstructure
Nano-silica
Offshore structures
Penetration resistance
Porosity
Scanning electron microscopy
Silica
Silicon dioxide
Thermogravimetric analysis
Underwater
Underwater concrete (UWC)
Underwater construction
X-ray diffraction
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Summary:Non-dispersible underwater concrete is a kind of construction material which is seeking its growing application in the offshore structures. However, the offshore structures are exposed to aggressive environment and harmful ions. Therefore, this study is conducted to investigate the mechanical, physical, microstructural, and durability-related properties of underwater concrete containing nano-silica and MgO. Nano-SiO2 was added at dosages of 0%, 1%, and 2%, and MgO was replaced at a rate of 0%, 5%, and 10% by weight of the binder. The effects of nano-silica and MgO particles was assessed via compressive strength test, Thermogravimetric analysis, X-ray diffraction, mercury intrusion porosimetry, and scanning electron microscopy. Chloride and carbonation resistance of the concrete specimens were also examined. The results suggest that the incorporation of nano-silica and MgO (at a dosage of 5%) improved the microstructure resulting in an elevated compressive strength and enhanced resistance to carbonation and chloride penetration. The addition of 10% MgO reduced the performance of concrete specimens, however, the incorporation of nano-silica compensated the reduction in performance. [Display omitted] •Durability performance of underwater concrete was investigated.•Effect of nano-silica and MgO was examined.•MgO at a cement replacement level of 5% resulted in an enhanced performance.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2021.11.020