Multiscale Experimental Investigation of the Influence of Pores on the Static and Dynamic Strength of Cementitious Materials
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 4
Abstract
This work studied the influence of pores of different scales on the strength of cementitious materials. A method to make pores in cementitious materials with particles of soft materials was developed and proved. With this method, mortar specimens with different porosity and pore-size distributions were prepared. The results of static and dynamic strength tests showed that the static and dynamic compressive strength decreases with the increase of porosity and average pore radius, whereas the strain rate sensitivity increases. Predictive models of static strength, dynamic strength, dynamic increase factor, and their respective relationships with multiscale porosity were proposed. The influence of multiscale pores on strength and strain rate sensitivity was calculated quantitatively. It indicated that when the pore radius is larger than 100 nm, at the same pore volume the effect of pores on static strength, dynamic strength, and strain rate sensitivity increases with the pore radius.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research was supported by the National Key Research and Development Program of China via Grant No. 2017YFC0404902, the National Natural Science Foundation of China via Grant No. 51479048, the Fundamental Research Funds for the Central Universities via Grant No. 2019B73614, and the Postgraduate Research and Practice Innovation Program of Jiangsu Province via Grant No. SJKY19_0456. The authors gratefully acknowledge the financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 3, 2019
Accepted: Sep 9, 2019
Published online: Jan 31, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 30, 2020
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