Solid Phases Percolation and Capillary Pores Depercolation in Hydrating Cement Pastes
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 12
Abstract
Solid phases percolation and capillary pores depercolation in hydrating cement pastes show great influences on mechanical properties and durability. In this paper, two nondestructive apparatuses, ultrasonic wave measurement and noncontacting electrical resistivity device, were used to in situ continuously track solid phases percolation and capillary pores depercolation evolution in cement pastes, respectively. In parallel with experiments, a hydration model was employed to simulate the early age formation of microstructure. The results show that first percolation (first depercolation) time and fully percolation (fully depercolation) time for solid phases (capillary pores) are identified from velocity (resistivity) curves. On one hand, a correlation is found between the change in connected volume of solid phases simulated with model and the evolution of velocity tested by ultrasonic wave measurement. In contrast, the development of resistivity is a good indicator for evaluating the depercolation of capillary pores.
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Acknowledgments
The authors first would like to express their sincere gratitude to Mr. Dale Bentz for kindly providing CEMHYD3D computer source codes and advice regarding the application. The authors also gratefully acknowledge the financial support from the Fundamental Research Funds for the Central Universities (2014QNA75).
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 12 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 15, 2013
Accepted: Dec 9, 2013
Published online: Dec 11, 2013
Discussion open until: Nov 18, 2014
Published in print: Dec 1, 2014
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