Experimental study on local damage effect of ultra-high performance concrete slabs under contact explosion

WEI Jiuqi; LI Lei; WANG Shihe; ZHANG Chunxiao; CAO Shaohua; GAO Jie

doi:10.11883/bzycj-2021-0174

Volume 42 Issue 4

May 2022

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WEI Jiuqi, LI Lei, WANG Shihe, ZHANG Chunxiao, CAO Shaohua, GAO Jie. Experimental study on local damage effect of ultra-high performance concrete slabs under contact explosion[J]. Explosion And Shock Waves, 2022, 42(4): 042201. doi: 10.11883/bzycj-2021-0174

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Experimental study on local damage effect of ultra-high performance concrete slabs under contact explosion

doi: 10.11883/bzycj-2021-0174

WEI Jiuqi^{1, 2
,},
LI Lei^{1, 2
,
,},
WANG Shihe^{1, 2},
ZHANG Chunxiao^{1, 2},
CAO Shaohua^{1, 2},
GAO Jie³

1.
Institute of Engineering Protection, Institute of Defense Engineering, Academy of Military Sciences, Luoyang 471023, Henan, China
2.
Henan Key Laboratory of Special Protective Materials, Institute of Engineering Protection, Institute of Defense Engineering, Academy of Military Sciences, Luoyang 471023, Henan, China
3.
Henan Dongjun Building Materials Technology Company, Xinyang 464200, Henan, China

Received Date: 2021-05-07
Rev Recd Date: 2021-09-15

Available Online: 2022-03-10

Publish Date: 2022-05-09

Abstract

Abstract

In order to study the contact explosion resistance of ultra-high performance concrete (UHPC), 24 contact explosion experiments were conducted. The target slabs were cast in UHPC with or without reinforcement, and the compressive strength grades of the UHPCs were C120, C150 and C180. The slabs were laid on supporting ring beams and the back faces of the slabs were free. The TNT was placed on the center of the front face. The size of the target slab was 1.5 m×1.5 m×0.3 m, and the main reinforcements were $\varnothing$ 12 HRB400 with 200 mm×200 mm grid distance. Based on the experiments, the local failure characteristics of typical reinforced and unreinforced target slabs under the shock of different explosive weights were quantitatively analyzed, and the critical collapse coefficient, compression coefficient and explosion crater coefficient of the UHPC slabs were obtained. The results show that, at the same explosive weight, the damage degree of the UHPC slabs decreases with the compressive strength. The higher the compressive strength, the smaller the compression coefficient and the explosion crater coefficient. When the reinforcement ratio is low, it has little effect on the front crater size and the back collapse damage degree of the UHPC slab, but has a certain role in reducing the residual deflection and crack width at the bottom of the slab. For the UHPCs in this paper, the critical collapse coefficient of the C150 slap is the smallest, no more than 0.251 m/kg^1/3; and the C120 slap and C180 slap are similar, no more than 0.285 m/kg^1/3. The critical collapse coefficients of the C180 UHPC is not the smallest because there are more steel fibers in the horizontal direction than in the vertical direction. When designing or using large size UHPC structures with high fiber content, special attention should be paid to the material anisotropy and the changes in structural mechanical properties due to the directivity of the fiber distribution.
- ultra-high performance concrete,
- contact explosion,
- local failure effect,
- critical collapse,
- compression failure

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References

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