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Open AccessArticle

Model for Predicting the Tortuosity of Transport Paths in Cement-Based Materials

1
School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2
Foundational subjects department, Shijiazhuang TieDao University SiFang College, Shijiazhuang 051132, China
3
Key Laboratory of Smart Material and Structures Mechanics, Hebei Province, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
4
School of Foreign Studies, Hebei Normal University, Shijiazhuang 050024, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(21), 3623; https://doi.org/10.3390/ma12213623
Received: 23 September 2019 / Revised: 27 October 2019 / Accepted: 31 October 2019 / Published: 4 November 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
The tortuosity of the pore structure is an important factor affecting medium (water and harmful ions) transport in cement-based materials. In this study, a new tortuosity model was established to reveal the effect of aggregate size, morphology, and graded media on the transport path in cement-based materials. Based on the stereological principle and the geometric algorithm, the distribution model of the ideal pebble and polygonal aggregate in cement-based materials was given first. Then, based on the image processing technology and MATLAB software, the morphology of the actual aggregate was also characterized to prove the similarity relationship between the ideal aggregate and actual aggregate. The reliability of the tortuosity model was verified by the mercury intrusion porosimetry test and data from other literature. Based on the tortuosity model, the influences of the aggregate particle shape parameters, hydration degree, and water-to-cement ratio on the tortuosity of the transport path were analyzed. Finally, the tortuosity model was further simplified to facilitate engineering application. View Full-Text
Keywords: pebble; gravel; tortuosity model; morphology characterization; cement-based materials pebble; gravel; tortuosity model; morphology characterization; cement-based materials
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MDPI and ACS Style

Cao, T.; Zhang, L.; Sun, G.; Wang, C.; Zhang, Y.; Yan, N.; Xu, A. Model for Predicting the Tortuosity of Transport Paths in Cement-Based Materials. Materials 2019, 12, 3623.

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