Studies on measurement of chloride ion concentration in concrete structures with long-period grating sensors

Based on the existing studies about chloride ion erosion in prestressed concrete structures, this paper intends to discuss the effects of the stress level and environment factors (including temperature and humidity, etc.) on chloride ion diffusion under marine atmosphere zone. The investigation from pre-stressed concrete crossbeams which service for 39 years in Lianyungang Port shows the chloride ion concentration distribution and chloride ion diffusion. According to the chloride ion concentration distribution, it finds that chloride ion concentration values in pre-concrete structures is Cmax,1> Cmax,2. In addition, the free chloride concentration distribution values go down smoothly after the second peak. Therefore, the result shows that the improved model can be used in marine atmosphere zone.

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A study of a real-time online monitoring system for the durability of concrete structures

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-11-2015-1608 ◽

2016 ◽

Vol 63 (3) ◽

pp. 184-189

Author(s):

Mingming Xiao ◽

Shilong Zhang ◽

Yanbing Tang ◽

Zhongmao Lin ◽

Jiahong Chen

Keyword(s):

Real Time ◽

Monitoring System ◽

Concrete Structures ◽

Chloride Ion ◽

Corrosion Current ◽

Ion Concentration ◽

Corrosion Monitoring ◽

Content Type ◽

System Data ◽

Durability Of Concrete

Purpose This study aims to explore the effect of corrosion monitoring technology for ensuring concrete structure safety. Design/methodology/approach A new monitoring system scheme with unattended operation to evaluate the durability of concrete structures is presented, which includes four components, namely, a multi-function embedded sensor, a microprocessor data collecting module, a system data analysis and storage module, and a remote server module. Findings The system carries out monitoring of chloride ion concentration and pH in concrete, corrosion current density and of the self-corrosion potential of the reinforcing steel bar. Originality/value This system provides real-time, online, lossless monitoring for concrete structures.

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Measurement of Chloride Ion Using a Long-Period Fiber-Grating-Based Microfluidic Chip System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.378-379.795 ◽

2011 ◽

Vol 378-379 ◽

pp. 795-798

Author(s):

Jian Neng Wang ◽

Jaw Luen Tang ◽

Wei Te Wu ◽

Der Cheng Chen ◽

Chien Hsing Chen ◽

...

Keyword(s):

Civil Engineering ◽

Chloride Ion ◽

Microfluidic System ◽

Raw Material ◽

Ion Concentration ◽

Fiber Grating ◽

Long Period Fiber Grating ◽

Long Period ◽

Period Fiber Grating ◽

Infrastructure Health

A microfluidic system for chloride ion measurement using a long-period fiber grating (LPFG) is presented. Optical fiber sensors based on waveguide technology are promising and attractive in chemical, biotechnological, and civil engineering applications. The LPFG-based microfluidic system used to measure the transmission powers of different chloride ion concentration solutions of sea sand and seawater. The results show the relationship between transmitted light intensities and different chloride ion concentration solutions was close to linear. This system could be potentially used to discriminate the different chloride ion concentration solutions. This LPFG-based microfluidic system for chloride ion measurement reported here could hopefully benefit the development and applications in the field of civil engineering especially for concrete and raw material testing as well as infrastructure health monitoring.

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Measurement of chloride ion concentration in concrete structures using terahertz time domain spectroscopy (THz-TDS)

Corrosion Science ◽

10.1016/j.corsci.2012.05.005 ◽

2012 ◽

Vol 62 ◽

pp. 5-10 ◽

Cited By ~ 25

Author(s):

Saroj R. Tripathi ◽

Hidehiro Ogura ◽

Hiroyuki kawagoe ◽

Hiroo Inoue ◽

Tsuyoshi Hasegawa ◽

...

Keyword(s):

Time Domain ◽

Concrete Structures ◽

Chloride Ion ◽

Ion Concentration ◽

Terahertz Time Domain Spectroscopy ◽

Time Domain Spectroscopy

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Conceptual study of salt-meter with 252Cf neutron source for on-site inspection of bridge structure

Journal of Neutron Research ◽

10.3233/jnr-210015 ◽

2021 ◽

pp. 1-7

Author(s):

Yasuo Wakabayashi ◽

Mingfei Yan ◽

Masato Takamura ◽

Ryuutarou Ooishi ◽

Hiroshi Watase ◽

...

Keyword(s):

Neutron Activation Analysis ◽

Activation Analysis ◽

Neutron Activation ◽

Neutron Source ◽

Concrete Structures ◽

Chloride Ion ◽

Ion Concentration ◽

Prompt Gamma ◽

Large Bulk ◽

Gamma Neutron Activation

We studied the feasibility of a portable salt-meter incorporating a prompt gamma neutron activation analysis with a californium-252 neutron source to meet urgent demands for non-destructive methods without pre-processing in large bulk materials such as concrete structures. This technique is aiming at the chloride ion concentration in concrete structures with a depth profile from the surface to steel bar. From the portability point of view, a californium-252 neutron source is adopted and we have performed a preliminary experiment and simulations with a simple geometry. In this paper, we describe the performances of salt detection sensitivities by applying the prompt gamma neutron activation analysis.

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