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International Journal of Corrosion
Volume 2012, Article ID 923010, 9 pages
Research Article

Multiscale Investigation of Porosity Characteristic in Concrete Exposed to Acidic Environment

Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian, Liaoning 116026, China

Received 24 February 2012; Accepted 16 May 2012

Academic Editor: Citlalli Gaona Tiburcio

Copyright © 2012 Y. F. Fan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Porosity has a significant effect on the mechanical response of concrete. It is essential to well understand the relation between porosity characteristics inside the concrete with the damage process of concrete exposed to the aggressive environment. To simulate the acidic environment, the acid solutions with pH level of 1.5 and 2.5 were deposed by the mixture of the sulfate and nitric acid in the laboratory. Computed tomography (CT) and scanning electron microscopy (SEM) were used to characterize the microstructures of concrete exposed to the acidic solution for the scheduled periods. Pore distribution and porosity ratio of concrete specimens suffering various damage processes are obtained. The CT digital images were analyzed by Pro-Plus software. The threshold value is suggested to identify the pore. The developments of pore structure and porosity ratio of the concrete samples are examined. The relation between the porosity characteristic and mechanical response of concrete is discussed.