Investigation of the Nonlinear Creep of Concrete with Different Initial Defect Rates under Continuous Compression with Acoustic Emission Technology
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 2
Abstract
The available models for estimating the creep strains of concrete generally assume concrete as a homogeneous material. Since concrete is a composite, such models cannot take into account incompatible strains between cement paste and aggregates during creep loading. The main objective of this paper is to demonstrate that initial defects could increase the creep strain level and justify the application of a coupling between creep and damage at the macroscopic scale. To do so, different contents of air-entraining agent were used to simulate the internal defects of concrete and high-stress continuous load was applied to concrete samples with different initial defects. By analyzing the stress-strain curves of concretes containing different initial defects after compression, it was concluded that the existence of internal defects had a significant effect on the basic mechanical properties of concrete samples. Acoustic emission technology was used to obtain the internal acoustic emission response of concrete samples under high stress. Creep development rate is nonlinear to load holding level based on the analysis of experimental data and internal structure of concrete samples.
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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 described in this paper was funded by the National Natural Science Foundation for Excellent Young Scientists of China (Grant No. 51722907); the National Natural Science Foundation of China (Grant No. 41731289); the National Natural Science Foundation of China (Grant No. 51979224); the National Natural Science Foundation of China (Grant No. 51909215) and Xi’an University of Technology Doctoral Dissertation Innovation Fund (Grant No. 51909215).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 2 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 8, 2020
Accepted: Jul 13, 2020
Published online: Nov 17, 2020
Published in print: Feb 1, 2021
Discussion open until: Apr 17, 2021
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