喷涂抗爆型聚脲钢筋混凝土板抗爆性能研究

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Abstract In order to study the protective effect of sprayed anti-blast polyurea QtechT26 (T26) on reinforced concrete slabs under explosive load, thermogravimetric analysis (TGA) was performed on T26, and its thermal stability under high temperature environment was studied. A non-contact explosion test was carried out on T26-coated reinforced concrete slabs, combined with scanning electron microscopy (SEM) and Fourier infrared spectroscopy (FTIR), the macroscopic failure mode of the structure and the microscopic damage behavior of the coating under the action of 10kg TNT were obtained. Using LS-NYNA to numerically simulate the test process and compare with the test results, the effect of T26 coating on the anti-blast performance of reinforced concrete slabs and the energy dissipation mechanism of the coating are analyzed. The research results show that the initial degradation temperature of T26 is 265 ℃, and the final degradation temperature is 510 ℃. The temperature at the beginning of degradation and the completion of degradation are both high, and it has good thermal stability. The main failure mode of the T26-coated reinforced concrete slab is the partial tearing of the front surface coating and a certain bulge. The maximum bulge height is 30 mm, and the front surface presents a high-temperature ablation. The coating on the back explosion surface and the side surface is not damaged, and the internal reinforced concrete slab is not significantly deformed. Under the coupling effect of the explosion shock wave and the high temperature, a large amount of molten flocs appear on the section and surface of the T26 coating. The total hydrogen bonding degree and the perfect hydrogen bonding degree of the surface are reduced by 21.5% and 18.2%, respectively, compared with before the explosion. The numerical simulation and the experimental results are in good agreement, indicating that the numerical model is reliable. The T26 coated reinforced concrete slab under the numerical simulation can absorb and transform more energy, and the anti-blast effect is better. Explosion test and numerical simulation results have proved that T26 coating can effectively enhance the anti-blast performance of reinforced concrete slabs, which can provide an important reference for the research of polyurea in the field of structural explosion protection.

Key words： polyurea thermal stability explosion test numerical simulation anti-blast performance energy dissipation mechanism

Published: 09 December 2021

CLC number:	O383+.2
	TB34

About author:: Pengfei Sun received his B.S. degree in engineering from Shandong Agricultural University inJune 2019. He is a postgraduate student at the Civil Engineering School, Qingdao University of Technology. At present, his research field is new functional materials, and the specific research direction is composite material anti-explosion and impact resistance.
Ping Lyu received her B.S. degree from Shaanxi University of Science & Technology, M.S. degree from Shaanxi University of Science & Technology, and Ph.D. degree from Ocean University of China in1986, 1989 and 2006, respectively. Her research interest lies in Structural durability research and protection technology, metamaterials and High-performance coating materials.

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	SUN Pengfei
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	HUANG Weibo
	ZHANG Rui
	FANG Zhiqiang
	SANG Yingjie

Cite this article:

SUN Pengfei,LYU Ping,HUANG Weibo, et al. Research of Explosion Resistance of Sprayed Anti-blast Polyurea Reinforced Concrete Slab[J]. Materials Reports, 2021, 35(z2): 642-648.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/Iz2/642

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