纳米氧化铝提升海洋环境高速铁路桥梁混凝土结构服役寿命研究

doi:10.11896/cldb.22060232

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Abstract Chloride-induced steel corrosion is one of the main deterioration mechanisms that lead to the durability issue of bridge concrete structures of high-speed railway exposed to marine environment. Improving the chloride resistance of concrete is the fundamental way to increase the service life of concrete structure. The development of nano technology and nano material provides a novel research direction towards higher performance concrete. In this work, the influence of nano alumina oxide (NA) on the chloride migration coefficient (D_RCM) and natural diffusion properties of mortar were firstly investigated. Based on the chloride binding isotherms, the chloride diffusion model with binding parameters of concrete were established. Meanwhile, the influence of NA on service life of concrete structures under chloride environment was simulated. The results show that the chloride resistance of mortar can be improved with an appropriate content of NA. With a protective layer of 60 mm and an addition of 2wt%NA, the service life of bearing platform C45 concrete is increased from 68 years to 107 years. The addition of NA provides a novel technology for prolonging the service life of concrete structures of high-speed railway exposed to marine environment.

Key words： high-speed railway concrete chloride nano alumina-oxide service life

Published: 10 April 2024 Online: 2024-04-11

CLC number:

TU528

Fund:National Natural Science Foundation of China (51925903, U1934206, 52178260).

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	YANG Zhiqiang
	WANG Zhen
	HUANG Fali
	YI Zhonglai
	JIANG Jinyang

Cite this article:

YANG Zhiqiang,WANG Zhen,HUANG Fali, et al. Improving the Service Life of Bridge Concrete Structure of High-speed Railway Exposed to Marine Environment by Adding Nano Alumina-oxide[J]. Materials Reports, 2024, 38(7): 22060232-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22060232 OR http://www.mater-rep.com/EN/Y2024/V38/I7/22060232

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