Open Access

ARTICLE

Experimental and Numerical Research on Water Transport during Adsorption and Desorption in Cement-Based Materials

Xiang Zhang^1,*, Miao Su¹, Wenjie Yu², Zhen Lei¹, Jun Ren¹, Juntong Qu¹

1 Department of Civil Engineering, Yunnan University, Kunming, 650091, China
2 School of Information Engineering, Kunming University, Kunming, 650214, China

* Corresponding Author: Xiang Zhang. Email:

(This article belongs to the Special Issue: Advanced Computational Methods in Fluid Mechanics and Heat Transfer)

Computer Modeling in Engineering & Sciences 2023, 136(2), 1487-1507. https://doi.org/10.32604/cmes.2023.025799

Received 30 July 2022; Accepted 26 September 2022; Issue published 06 February 2023

Abstract

The durability of cement-based materials is related to water transport and storage in their pore network under different humidity conditions. To understand the mechanism and characteristics of water adsorption and desorption processes from the microscopic scale, this study introduces different points of view for the pore space model generation and numerical simulation of water transport by considering the “ink-bottle” effect. On the basis of the pore structure parameters (i.e., pore size distribution and porosity) of cement paste and mortar with water-binder ratios of 0.3, 0.4 and 0.5 obtained via mercury intrusion porosimetry, randomly formed 3D pore space models are generated using two-phase transformation on Gaussian random fields and verified via image analysis method of mathematical morphology. Considering the Kelvin-Laplace equation and the influence of “ink-bottle” pores, two numerical calculation scenarios based on mathematical morphology are proposed and applied to the generated model to simulate the adsorption-desorption process. The simulated adsorption and desorption curves are close to those of the experiment, verifying the effectiveness of the developed model and methods. The obtained results characterize water transport in cement-based materials during the variation of relative humidity and further explain the hysteresis effect due to “ink-bottle” pores from the microscopic scale.

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Keywords

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