Chloride Diffusion Properties of Cement Mortar Under Salt Spray Wetting–Drying Cycle

被引：0

作者：

Yuan Q. ^{[1
,2
]}

Wang Y. ^{[1
,2
]}

Zhang K. ^{[1
,2
]}

Zhang J. ^{[3
]}

Rao H. ^{[4
]}

Chen Q. ^{[4
]}

Zhang F. ^{[5
]}

Zhang Z. ^{[4
]}

机构：

[1] School of Civil Engineering, Central South University, Changsha

[2] National Engineering Research Center of High-speed Railway Construction Technology, Changsha

[3] Shandong CSCEC Urban Development Co., Ltd, Jinan

[4] Southeast Coastal Railway Fujian Co. Ltd., Fuzhou

[5] China Railway Nanchang Group Co., Ltd., Nanchang

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2023年 / 51卷 / 11期

关键词：

chloride transport; durability; effective diffusion coefficient; offshore; wet-dry cycle;

D O I：

10.14062/j.issn.0454-5648.20230550

中图分类号：

学科分类号：

摘要：

The deterioration of the durability of marine concrete and the degree of corrosion of internal steel bars in the tidal, splash and atmospheric zones are often serious in salt spray wetting and drying cycle. The diffusion of chloride in cement-based materials was investigated at different parameters (i.e., mix ratio, dry-wet ratio, and exposure time) by a cycle test of salt spray wetting and drying and a test method of layered grinding and potentiometric titration. The results show that the deposition and transport of chloride ions in mortar are primarily affected by salt spray wetting-drying cycle, dry-wet ratio, water-binder ratio, and exposure period. The influence of water-binder ratio is dominant, while the influence of dry-wet ratio is slight. The maximum concentration of chloride Cmax and the effective chloride diffusion coefficient Deff increase as water-binder ratio improves. Cmax firstly increases and subsequently declines as fly ash amount and frequency of dry-wet cycles increase. Deff decreases as exposure time increases. Deff firstly increases and subsequently reduces as fly ash content increases. Low water-binder ratio and use of fly ash can effectively postpone chloride erosion, thereby enhancing the durability of structures. © 2023 Chinese Ceramic Society. All rights reserved.

引用

页码：2805 / 2813

页数：8

共 20 条

[1] WU L J, LI W, YU X N., Time-dependent chloride penetration in concrete in marine environments, Constr Build Mater, 152, pp. 406-413, (2017)
[2] BOURREAU L, GAILLET L, BOUTEILLER V, Et al., Spatial identification of exposure zones of concrete structures exposed to a marine environment with respect to reinforcement corrosion, Struct Infrastruct Eng, 16, 2, pp. 346-354, (2020)
[3] ZHUANG X Y, CHEN L, KOMARNENI S, Et al., Fly ash-based geopolymer: Clean production, properties and applications, J Clean Prod, 125, pp. 253-267, (2016)
[4] MORENO J D, BONILLA M, ADAM J M, Et al., Determining corrosion levels in the reinforcement rebars of buildings in coastal areas: A case study in the Mediterranean coastline, Constr Build Mater, 100, pp. 11-21, (2015)
[5] HUET B, L'HOSTIS V, SANTARINI G, Et al., Steel corrosion in concrete: Determinist modeling of cathodic reaction as a function of water saturation degree, Corros Sci, 49, 4, pp. 1918-1932, (2007)
[6] LI Chunqiu, LI Kefei, J Chin Ceram Soc, 38, 4, pp. 581-589, (2010)
[7] YANG Lufeng, CAI Rong, YU Bo, China Civ Eng J, 50, 12, pp. 46-55, (2017)
[8] LIU Shiqun, SUN Congtao, NIU Ditao, Bull Chin Ceram Soc, 33, 1, pp. 83-91, (2014)
[9] SHAO W, LI J P, LIU Y., Influence of exposure temperature on chloride diffusion into RC pipe piles exposed to atmospheric corrosion, J Mater Civ Eng, 28, 5, (2016)
[10] ROY S K, NORTHWOOD D O., Chloride ingress in concrete as measured by field exposure tests in the atmospheric, tidal and submerged zones of a tropical marine environment, Cem Concr Res, 23, 6, pp. 1289-1306, (1993)

← 1 2 →