Tests and Numerical Studies on Strain-Rate Effect on Compressive Strength of Recycled Aggregate Concrete
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 11
Abstract
In this study, the compressive strength of recycled aggregate concrete (RAC) was investigated by conducting quasi-static and split Hopkinson pressure bar (SHPB) tests. Three types of RAC specimens with recycled coarse aggregate (RCA) replacement percentages (i.e., 30%, 70%, and 100%) and the natural aggregate concrete (NAC) specimen as reference were prepared and tested. Failure modes of the specimens were observed and compared, and dynamic compressive strength was recorded. The effect of different RCA replacement percentages on the compressive strength under quasi-static and dynamic loads was studied. The empirical formulae were proposed for dynamic increase factor (DIF) of the compressive strength for RAC. In this study, the DIF of compressive strength raises with the rising RCA replacement percentage. Besides, the continuous surface cap model (CSCM) is developed by considering strain rate effect for RAC material, and its accuracy is calibrated with the SHPB testing data by using LS-DYNA. The numerical results show that CSCM incorporating strain rate effect can yield more accurate prediction on dynamic compressive strength of RAC.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request:
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The data for the figures and tables.
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The data for the CSCM model of the numerical simulation.
Acknowledgments
The authors would like to acknowledge National Natural Science Foundation of China (51578246) and Guangdong Province Natural Sciences (2017A030313263) and Fujian Province Natural Sciences (2019J01885) for financial support to carry out this study. The third author acknowledges the support from Australian Research Council via Discovery Early Career Researcher Award (DE160101116).
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©2019 American Society of Civil Engineers.
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Received: Aug 18, 2018
Accepted: Jun 4, 2019
Published online: Sep 9, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 9, 2020
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