Electrical Resistance to Monitor Carbonation and Chloride Ingress

Wang, Yaocheng; Nanukuttan, Sreejith; Bai, Yun; Yang, Kai; Basheer, Pam

doi:10.14359/51716834

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…A similar behavior between zero and seven days has been described by Wang et al [41], who observed that the resistivity does not decrease instantaneously with the ingress of Cl − because there is no contribution to the electric current flow at the moment of chloride ion binding to the hydration products. Similarly, Loche et al [42] reported that Cl − ions modified the electrical response of cement-based materials.…”

Section: Electrical Resistivity Of Chloride-free Specimenssupporting

confidence: 82%

Exploring the Detection of Cl− Penetration in Portland Cement Mortars via Surface Electrical Resistivity

Pablo-Calderón,

Cano-Barrita,

León-Martínez

2023

Materials

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Surface electrical resistivity is a non-destructive technique that is sensitive to the microstructure of hydrated cement paste and the chemical composition of the pore solution in cement-based materials. In this study, a Wenner array was used to measure changes in mortar resistivity due to chloride ion diffusion as a function of electrode separation. Specimens were made from four mortar mixtures: 100% Ordinary Portland cement and 60% cement + 40% fly ash at two water/binder ratios of 0.55 and 0.40. The specimens were subjected to unidirectional chloride ion diffusion in a 2.8 M NaCl solution for 175 days. To determine the chloride penetration depth, three methods were used: silver nitrate spraying, chloride concentration profiles via potentiometric titration, and chloride concentration profiles via inversion of the resistivity data using the RES1D software (version 1.00.09 Beta). The results showed a linear relationship between the chloride ion penetration depth obtained via inversion of the surface electrical resistivity data versus the penetration depth from colorimetry and from chloride concentration profiling (both with R2 = 0.8612). Chloride penetration changed the conductivity of the pore solution; therefore, the resistivity decreased when increasing both the chloride concentration and the penetration depth. Inversion of surface resistivity data obtained with a Wenner array permitted non-destructive determination of chloride penetration. However, these results were obtained under laboratory environmental conditions and other scenarios must be addressed for wider applications.

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Section: Electrical Resistivity Of Chloride-free Specimenssupporting

confidence: 82%

Exploring the Detection of Cl− Penetration in Portland Cement Mortars via Surface Electrical Resistivity

Pablo-Calderón,

Cano-Barrita,

León-Martínez

2023

Materials

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“…Determination of electrical resistivity is also a standardized method for investigating properties of hardened concrete (EN-12390-19) [16]. The application of this technique as a qualitative way for better understanding of the hydration evolution in cementitious matrices [17,18] as well monitoring durability of concrete [19][20][21], is discussed in the literature. However, up to the knowledge of the authors no record of using this technique to monitor carbonation profiles in cementitious specimens is reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive monitoring of carbonation propagation in cementitious systems using the measurement of intrinsic electrical property

Babaahmadi,

Tang,

Huang

et al. 2024

Preprint

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Monitoring carbonation in concrete is crucial for assessing the long-term durability of structures. Reducing clinker content by incorporating supplementary cementitious materials raises concerns about carbonation-induced corrosion and alterations in pore solution chemistry as well as microstructure. These changes can significantly impact the durability and engineering properties of concrete. Therefore, there is a critical need for thorough monitoring of carbonation propagation within the evaluation of the new generation of composite binders. To monitor carbonation, various techniques are employed. One common method involves splitting specimens and using pH indicators, such as phenolphthalein, to detect changes in the concrete's alkalinity. This paper presents the development of a novel carbonation monitoring method based on conductivity measurements in cementitious matrix. The proposed method leverages the correlation between carbonation and changes in concrete's electrical conductivity. The method enables in-situ monitoring of carbonation propagation in mortar specimens through application of embedded mini-sensors for measurement of electrical properties. The developed mini-sensors consist of 10 sets of 4-points-Winner electrodes (stainless steel) at a depth interval of 2.54 mm for conductivity measurements. By strategically placing these mini-sensors within the cementitious matrix, real-time measurements can be carried out, allowing for continuous monitoring of carbonation progression. This approach offers advantages in terms of cost-effectiveness, simplicity, and non-destructiveness compared to traditional destructive laborious methods.

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Electrical Resistance to Monitor Carbonation and Chloride Ingress

Abstract: He has published numerous papers on in situ measurement of transport properties of concrete and alkali activated cementitious materials.

Cited by 2 publications

References 16 publications

Exploring the Detection of Cl− Penetration in Portland Cement Mortars via Surface Electrical Resistivity

Exploring the Detection of Cl− Penetration in Portland Cement Mortars via Surface Electrical Resistivity

Non-destructive monitoring of carbonation propagation in cementitious systems using the measurement of intrinsic electrical property

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