Experimental Study of the Dynamic Mechanical Properties of High-Performance Equal-Sized–Aggregate Concrete
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 2
Abstract
The preparation of high-performance equal-sized–aggregate (HPESA) concrete has reversed current thinking about targets pertaining to high density and strength when designing traditional concrete materials. Maintaining the integrity of aggregates to prevent explosive failure at low strain, allowing use as an antiexplosion buffer filling layer in underground engineering works, is important. It is possible to repair the structures in situ after a disaster. Dynamic mechanical properties at different strain rates and obtaining optimal mix design parameters under impact loads were studied. According to the application requirement of antiexplosion buffer filling material in underground engineering, 16 groups of specimens were prepared with different mix designs. These were subjected to split Hopkinson bar (SHPB) testing at different impact-loading strain rates. The dynamic mechanical properties of HPESA concrete materials were correlated with impact-loading strain rates. At different strain rates, three types of stress–strain curves were exhibited: single-peak, double-peak, and transition types. The sensitivity of materials to strain rates was positively correlated with aggregate sizes. The energy dissipation of HPESA concrete materials under impact loading can be divided into damage fracture energy and inertial potential energy. The effects of four influencing factors (aggregate size, polymer–cement ratio, water–cement ratio, and cement–aggregate ratio) on energy dissipation in the specimens were explained theoretically. From the range analysis results of orthogonal tests, the primary and secondary order of the influencing factors on energy consumption indices was obtained, and the optimal energy-consumption ratio parameters of the material for antiexplosive buffer filling materials were determined, which lays a foundation for the subsequent application of this material.
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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, such as:
All the mixing ratio parameters of the material.
Some basic physical and mechanical parameters of the material.
Some pictures of the material destruction recorded by high-speed photography test system.
Some data of the incident, reflected, and transmitted waves that were obtained by SHPB tests.
All data of the stress–strain curves.
Acknowledgments
We thank the Postdoctoral Research Fund for Jiangsu Planned Projects (Grant No. 2018K047A) and the China Postdoctoral Science Foundation Fund (Grant No. 2018M643854) for their financial support.
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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: Dec 16, 2019
Accepted: Jun 4, 2020
Published online: Nov 30, 2020
Published in print: Feb 1, 2021
Discussion open until: Apr 30, 2021
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