Assessment of corrosion prevention methods for steel reinforcement embedded in concrete exposed to a natural marine environment

被引:13
作者
Gomez-Luna, G. F. [1 ]
Lopez-Calvo, H. Z. [2 ]
Bremner, T. W. [3 ]
Fajardo-San Miguel, G. J. [4 ]
Castro-Borges, P. [5 ]
Montes-Garcia, P. [1 ]
机构
[1] CIIDIR Oaxaca, Inst Politecn Nacl, Grp Mat & Construcc, Hornos 1003, Sta Cruz Xoxocotlan, Oax, Mexico
[2] Univ Autonoma Benito Juarez Oaxaca UABJO, Fac Arquitectura Mayo 5, Cuerpo Acad Tecnol & Sustentabil, 5 Mayo 111, Oaxaca, Oax, Mexico
[3] Univ New Brunswick, Dept Civil Engn, Fredericton, NB E3B 5A3, Canada
[4] Univ Autonoma Nuevo Leon UANL, Fac Ingn Civil, Grp Acad Tecnol Concreto, San Nicolas De Los Garza, NL, Mexico
[5] Ctr Invest & Estudios Super IPN, Unidad Merida UANL, Km 6 Ant Carr Progreso, Merida 97310, Yucatan, Mexico
关键词
Corrosion of steel reinforcement; Fly ash; CNI; Chloride-natural environment; Mass loss; Elongation; CHLORIDE-ION PENETRATION; VOLUME FLY-ASH; CALCIUM NITRITE; MECHANICAL-PROPERTIES; COMPRESSIVE STRENGTH; CRACK WIDTH; PERFORMANCE; HYDRATION; BINDING; RESISTANCE;
D O I
10.1016/j.conbuildmat.2023.131514
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Corrosion of the steel reinforcement is a serious problem that lessens the durability of concrete structures. Numerous research studies focus on the improvement of the concrete matrix and the protection of the reinforcing bars against corrosion. Fly ash and silica fume have been used for the former and inhibitors for the latter; nevertheless, corrosion is a very complex multifactorial phenomenon because the deterioration mechanisms involved in a simulated-marine environment differ from those involved in a natural environment. Despite these facts most corrosion studies have been carried out in a laboratory under accelerated conditions and using non-destructive testing. In this research, the effects of the water-cementitious materials ratio, fly ash, and a calcium nitrite-based corrosion inhibitor, as well as their interactions, were investigated as methods to prevent the corrosion of reinforcing steel in concrete containing silica fume. Specimens were exposed to a natural marine environment for seven years and the corrosive activity was monitored annually using electrochemical tech-niques. At the end of the exposure period, the specimens were visually inspected, autopsied and the chloride concentrations at the steel-concrete interfaces were estimated. The steel bars were extracted and their mass losses and pitting depths evaluated and finally tested for tension. The results show the underlying performance of fly ash, alone or in combination with CNI, improves the concrete matrix and is an effective corrosion prevention method.
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页数:11
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