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Abstract

As the dynamic behavior of the concrete is different from that under static load, this research focuses on the study of dynamic responses of concrete by simulating the split Hopkinson pressure bar (SHPB) test. Finite element code LS-DYNA is used for modeling the dynamic behaviors of concrete. Three continuous models are reviewed and the Holmquist-Johnson-Cook model (HJC) is introduced in detail. The HJC model which has been implemented in LS-DYNA is used to represent the concrete properties. The SHPB test model is established and a few stress waves are applied to the incident bar to simulate the dynamic concrete behaviors. The stress-strain curves are obtained. The stress distributions are analyzed. The crack initiation and propagation process are described. It is concluded that: the HJC model can modeling the entire process of the fracture initiation and fragmentation; the compressive of the concrete is significantly influenced by the strain rates.

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Authors and Affiliations

H.M. An
L. Liu
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Abstract

Improper disposal of waste tires will not only bring environmental impact and safety risks but also cause a serious waste of resources. In the field of civil engineering materials, waste tire particles are used as a substitute for non-renewable aggregates to produce flexible rubber-cement composites (RCC). To explore the high-speed slicing stability of RCC, this test took normal cement mortar (NCM) and rubber cement mortar (RCM) as research objects. The SHPB tests with the same impact energy level and the high-speed slicing tests with a slice thickness range of about 1.4 mm ~ 4.4 mm were carried out. The results showed that NCM and RCM showed different stability differences in the process of high-speed slicing. In the case of ensuring the integrity of the slice, the minimum thickness of the slice can be better decreased with the increase of the rubber content. Finally, from the perspectives of split Hopkinson pressure bar (SHPB) test results and mesoscopic structure states, the essential reason for ensuring the stability of high-speed slicing lied in the improvement of rubber particles (dominant role) and pores on material deformation and flexible energy dissipation.
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Authors and Affiliations

Rongzhou Yang
1
ORCID: ORCID
Ying Xu
1
ORCID: ORCID
Pei Yuan Chen
2
ORCID: ORCID

  1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
  2. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
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Abstract

In order to study the dynamic splitting tensile properties of new and old concrete after high temperature treatment, the effects of different impact velocities and temperatures on failure modes, dynamic splitting strength and energy absorption of new and old concrete were analyzed by impact dynamic splitting tensile test use of variable cross-section Φ 74 mm split Hopkinson pressure bar apparatus. The results show that: Impact velocity and temperature not only affect the dynamic splitting strength of new and old concrete bonding specimens, but also affect the failure modes and degree of breakage. The dynamic splitting strength of new and old concrete increases with the increase of impact velocity, but the increase rate decreased with the increase of temperature. The dynamic splitting strength first increases slowly and then decreases dramatically with the increase of temperature. In the dynamic splitting test of new and old concrete, the energy absorption increases with the increase of impact velocity and decreases with the increase of temperature.
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Bibliography

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[2] Zhi-fang Zhao et al., “Experimental study on adhesive tensile performance of young on old concrete”, Journal of Building Stucture, vol. 22, no.2, pp. 51–56, 2001.
[3] Zhi-fang Zhao, Guo-fan Zhao, and Cheng-kui Huang, “Research on adhesive bending behavior of young on old concrete”, China Civil Engineering Journal, vol. 33, no. 2, pp. 67–72, 2000.
[4] Li-na Jin et al., “Experimental study of shear performance of new-to-old concrete interface”, Journal of Experimental Menchanics, vol. 29, no. 5, pp. 611–619, 2014.
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[7] H.H. Hussein, “Interfacial properties of ultrahigh-performance concrete and high-strength concrete bridge connections”, Journal of Materials in Civil Engineering, vol. 28, no.5, pp. 1943–5533, 2016, DOI: 10.1061/(ASCE) MT.1943-5533.0001456.
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[9] M.A. Carbonell Munoz, “Bond performance between ultrahigh-performance concrete and normal-strength concrete”, Journal of Materials in Civil Engineering, vol. 26, no. 8, pp. 1943–5533, 2014, DOI: 10.1061/(ASCE) MT.1943-5533.0000890.
[10] Ju-hui Zhang and Yue Li, “Research summary on factors about influencing strength of interfacebetween new and old concrete”, Concrete, vol. 10, pp. 156–162, 2017.
[11] Ma Qin-Yong, et al, “Experiment and analysis on adhesive bending performance of post pouring concrete on precast concrete”, Journal of Materials Science and Engineering, vol. 36, no. 1, pp. 47–50, 2018.
[12] Jin-yu Xu et al, “Impact mechanical properties of concrete at and after exposure to high temperature”, Journal of Building Materials, vol. 16, no. 1, pp. 1–5, 2013.
[13] Bao-jun Pang et al., “Experimental study on impact properties of reactive powder concrete using SHPB after exposure in high temperature”, Journal of Building Materials, vol. 15, no. 3, pp. 317–321, 2012, DOI: 10.3969/j.issn. 1007-9629.2012.03.005.
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[20] Li-li Wang, “Foundation of stress waves”, 2nd ed, Beijing, National Defense Industry Press, pp. 5–64, 2010.


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Authors and Affiliations

Hai Cao
1
ORCID: ORCID

  1. Huangshan University, School of Civil Engineering and Architecture, HuangShan 245041,China
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Abstract

To promote the application of rubber-cement composites as the main bearing structure and key components in practical engineering under frequent dynamic disturbances, in this work, the split Hopkinson pressure bar (SHPB) cyclic impact tests of rubber-cement composite specimens with four different confine modes were carried out in which the impact load increased sequentially. The relationship between average strain rate, ultimate strain and impact times and the relationship between peak stress, damage energy, ultimate strain and incident energy were analyzed. The results showed that the appropriate confine reinforcement treatment can make rubber-cement composite give full play to its deformation ability when it was completely damaged. Carbon fiber-reinforced polymer (CFRP) sheet and steel cylinder can work together with the rubber-cement composite matrix to resist impact load, which effectively improves the structural strength, damage fracture energy, and cyclic impact resistance of the rubber-cement composite. Finally, based on the effect difference of confine modes, the simplified plane force models of rubber-cement composite specimens with four different confine modes were established, which clearly revealed the completely different impact resistance mechanism of the rubber-cement composites with different constraints under cyclic impact loading.
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Authors and Affiliations

Rongzhou Yang
1
ORCID: ORCID
Ying Xu
1
ORCID: ORCID
Peiyuan Chen
2
ORCID: ORCID
Lin Cheng
2
ORCID: ORCID
Jinfu Ding
2
ORCID: ORCID
Hongxin Fu
2
ORCID: ORCID

  1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
  2. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

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