Technical Papers
Sep 29, 2021

Three-Dimensional Modeling of Transport Properties in Hardened Cement Paste Using Metal Centrifugation-Based Pore Network

Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 12

Abstract

Accurate prediction of transport properties for cementitious materials remains a challenge since it is difficult to experimentally obtain the realistic three-dimensional (3D) pore network of cement paste. In this study, the 3D pore network of cement paste is quantitatively characterized using nano X-ray microtomography coupled with the metal centrifugation porosimetry (MCP). First, the MCP technique is carried out to impel the liquid metal into the pore network of cement paste. Subsequently, the 3D pore network of cement paste with the intruded metal is reconstructed using high-resolution X-ray microtomography. Finally, based on the X-ray microtomography images, the transport properties of cement paste including ionic diffusivity and fluid permeability are simulated using a set of lattice Boltzmann transport models. The results show that the metal alloy can significantly enhance the contrast between the pore network and solid phase, and the realistic 3D pore network can be successfully reproduced. For the cement pastes with water-to-cement (w/c) ratios of 0.5 and 0.6, the transport properties are dramatically increased with the improving w/c ratio. A similarly dramatic growth evolution of transport properties also occurs when the effective porosity of cement pastes raises from 27.56% to 36.11%.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

Acknowledgments

The financial support provided by the National Key Research and Development Program of China (No. 2019YFC1904904) and Natural Science Foundation of China (51878153 and 51808189) is gratefully acknowledged.

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Journal of Materials in Civil Engineering
Volume 33Issue 12December 2021

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Received: Nov 23, 2020
Accepted: Apr 26, 2021
Published online: Sep 29, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 28, 2022

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Ph.D. Student, School of Materials and Science Engineering, Southeast Univ., Nanjing 211189, China; Dept. of Civil, Environmental and Geomatic Engineering, Univ. College London, London WC1E 6BT, UK. Email: [email protected]
Rusheng Qian [email protected]
Ph.D. Student, School of Materials and Science Engineering, Southeast Univ., Nanjing 211189, China. Email: [email protected]
Guojian Liu [email protected]
Assistant Professor, School of Civil Engineering, Suzhou Univ. of Science and Technology, Suzhou 215011, China. Email: [email protected]
Mingzhong Zhang [email protected]
Associate Professor, Dept. of Civil, Environmental and Geomatic Engineering, Univ. College London, London WC1E 6BT, UK. Email: [email protected]
Yunsheng Zhang [email protected]
Professor, School of Materials and Science Engineering, Southeast Univ., Nanjing 211189, China; Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou Univ. of Technology, Lanzhou 730050, China (corresponding author). Email: [email protected]

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