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Open AccessArticle

Characterization of Porous Cementitious Materials Using Microscopic Image Processing and X-ray CT Analysis

1
Department of Civil and Environmental Engineering, The Pennsylvania State University, State College, PA 16801, USA
2
School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University, Suwon 16419, Korea
3
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
*
Author to whom correspondence should be addressed.
Materials 2020, 13(14), 3105; https://doi.org/10.3390/ma13143105
Received: 4 June 2020 / Revised: 8 July 2020 / Accepted: 10 July 2020 / Published: 12 July 2020
(This article belongs to the Special Issue High Performance Concrete)
The use of lightweight concrete has continuously increased because it has a primary benefit of reducing dead load in a concrete infrastructure. Various properties of lightweight concrete, such as compressive strength, elastic modulus, sound absorption performance, and thermal insulation, are highly related to its pore characteristics. Consequently, the identification of the characteristics of its pores is an important task. This study performs a comparative analysis for characterizing the pores in cementitious materials using three different testing methods: a water absorption test, microscopic image processing, and X-ray computed tomography (X-ray CT) analysis. For all 12 porous cementitious materials, conventional water absorption test was conducted to obtain their water permeable porosities. Using the microscopic image processing method, various characteristics of pores were identified in terms of the 2D pore ratio (i.e., ratio of pore area to total surface area), the pore size, and the number of pores in the cross-sectional area. The 3D tomographic image-based X-ray CT analysis was conducted for the selected samples to show the 3D pore ratio (i.e., ratio of pore volume to total volume), the pore size, the spatial distribution of pores along the height direction of specimen, and open and closed pores. Based on the experimental results, the relationships of oven-dried density with these porosities were identified. Research findings revealed that the complementary use of these testing methods is beneficial for analyzing the characteristics of pores in cementitious materials. View Full-Text
Keywords: microscopic image processing; X-ray CT analysis; porous cementitious materials; 3D tomographic image microscopic image processing; X-ray CT analysis; porous cementitious materials; 3D tomographic image
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Yoon, J.; Kim, H.; Sim, S.-H.; Pyo, S. Characterization of Porous Cementitious Materials Using Microscopic Image Processing and X-ray CT Analysis. Materials 2020, 13, 3105.

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