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Electrical resistivity analysis for the internal capillary water migration mechanism of porous stone

  • Research Article - Applied Geophysics
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Abstract

Porous stone that has been exposed to the natural environment for a long time has developed a variety of diseases under the influence of environmental and geological factors. Especially, migration of soluble salt solution in porous stone and salt crystallization will inevitably lead to the deterioration of stone surface. To investigate the spatial and temporal evolution features of porous stone during capillary water migration, a series of capillary water absorption tests with different types of porous sandstone were performed. The process of capillary water absorption and stone surface deterioration characteristics was observed by high-density resistivity method. The results indicate that the process of capillary rise can be divided into stages of rapid rising, transition, and slow rising. According to the analysis of electrical resistivity measurements at millimeter scale, there was a negative correlation between capillary rise rate and sample total porosity, and the rising trend of the dry–wet interface was presented as the saddle shape. Then, a novel capillary rise model was proposed considering the variation in pore saturation. Moreover, it has been demonstrated that the migration and crystallization of soluble salt solution were the main causes for the change of micropore structure, resulting in increased deterioration of porous stone during the dry–wet cycles. This present study serves as some references for the protection and restoration of porous stone.

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Acknowledgements

This research is supported by the National Natural Science Foundation of China (No. 52179096) and the Natural Science Foundation of Chongqing (No. cstc2021jcyj-msxmX0903).

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Correspondence to Haiqing Yang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Edited by Prof. Bogdan Mihai Niculescu (ASSOCIATE EDITOR) / Prof. Gabriela Fernández Viejo (CO-EDITOR-IN-CHIEF).

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Yang, H., Chen, C., Zhao, G. et al. Electrical resistivity analysis for the internal capillary water migration mechanism of porous stone. Acta Geophys. 72, 213–231 (2024). https://doi.org/10.1007/s11600-023-01081-w

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  • DOI: https://doi.org/10.1007/s11600-023-01081-w

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