Dynamic Properties of Silt-Based Foamed Concrete as Filler in Subgrade
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 10
Abstract
To investigate the dynamic response of silt-based foamed concrete as filler in subgrade, this paper conducted staged cyclic loading experiments to examine its dynamic properties. Influence factors such as wet density and silt content were also addressed in experiments. The results of tests indicated that the hysteretic curves of silt-based foamed concrete presented obvious elastoplastic characteristics, and the dynamic stress–cumulative strain curves have a strain-hardening phenomenon. Dynamic strength increased a mean level of 65% when density increased by an average of at the range of density . Meanwhile, the dynamic strength decreased by an average of 14.2% if silt content increased by a mean of 10%. Furthermore, the addition of silt transformed the pore structures from uniformly distributed sphericity into irregular combined bubbles with larger diameters. Besides, during the staged cyclic loading process, it was deduced that dynamic elastic modulus of material has a variation with cycles, but can be basically assumed constant in tests. Thus, the dynamic stress–cumulative strain curves of silt-based foamed concrete subjected to staged cyclic loads were derived based on the Ramberg-Osgood equation. The parameters of the Ramberg-Osgood equation were also analyzed according to the test data. Finally, the damage variable expressions versus plastic strain and cyclic numbers were established respectively. It was found that density and silt content can significantly affect damage evolution.
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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 authors would like to acknowledge Shandong Express Co., Ltd. of China for the financial support of this project.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 10 • October 2022
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© 2022 American Society of Civil Engineers.
History
Received: Nov 16, 2021
Accepted: Jan 26, 2022
Published online: Jul 18, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 18, 2022
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