基于可靠度的海洋浪溅区大掺量矿渣混凝土结构服役寿命预测

doi:10.11896/cldb.201902012

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Abstract The long-term erosion and scouring effect of sea waves usually causes corrosion to steel bar as well as swelling and cracking of protective la-yer, which eventually affect durability and service life of concrete structures constructed in marine condition. Based on the reliability theory, modified chloride diffusion theory and the ChaDuraLife V1.0 life analysis software, herein we selected 3 kinds of high performance concrete differing in slag content and conducted the service life calculation and analysis upon long-term exposure to laboratory and marine wave condition. The results indicated that: the failure probability of high performance slag concrete structure in marine environment gradually increases and the reliabi-lity index gradually decreases as time goes on during service. Either a higher slag content or a larger thickness of protective layer is beneficial to the service life of high-performance slag concrete structure. Under the circumstance of ocean wave splash zone, the C50 high-performance slag concretes in which slag content and fly ash content are 35% and 15%, respectively, could meet the service life requirements of 50 a,100 a and 120 a in the cases of protective layer thicknesses of 7 cm,8 cm and 9 cm. In addition, we suggest that the minimum protective layer thickness of concrete in splashed zone and the maximum DRCM (28 d age chloride diffusion coefficient) in the "Code for Design of Durability of Concrete Structures" are revised to attain the stipulated designed service life requirements.

Key words： marine condition slag concrete chloride diffusion reliability service life design

Published: 31 January 2019

CLC number:

TU528

Fund:This work was financially supported by the National Key Basic Research Development Plan of China (973 Plan) (2015CB655102), the Open Research Funds for State Key Laboratory of High Performance Civil Engineering Materials (2015CEM001), the Graduate Student Scientific Research Innovation Projects in Jiangsu Province (KYLX15-0230), the Graduate Innovation Center in NUAA (kfjj20170109).

About author:: Zhangyu Wu, majored in architecture and civil engineering in Nanjing University of Aeronautics and Astronautics in 2016, master degree candidate focusing on the research of steel corrosion and durability of coral aggregate concrete.Hongfa Yu received his PhD. degree in materials from Southeast University in 2004. He is currently an professor in Nanjing University of Aeronautics and Astronautics (NUAA). He is mainly majored in the durability evaluation and life design of concrete structures.

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	WU Zhangyu
	YU Hongfa
	MA Haiyan
	FENG Taotao
	DA Bo

Cite this article:

WU Zhangyu,YU Hongfa,MA Haiyan, et al. Calculating the Service Life of High Volume Slag Concrete Structure Based on Reliability in Ocean Splash Area[J]. Materials Reports, 2019, 33(2): 264-270.

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http://www.mater-rep.com/EN/10.11896/cldb.201902012 OR http://www.mater-rep.com/EN/Y2019/V33/I2/264

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