梯度结构混凝土构件的设计、制备与性能评价

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Abstract The design of a gradient structural concrete component was investigated to improve the durability of concrete structures under harsh environments. On the basis of the theory of functionally graded materials with high crack resistance, low transmission, and good self-repairing capability of the cement-based material without a mesoscopic interface transition zone, the reinforcement on performance of protective layer could be achieved. Given the differences in construction situation, structural shape, inner, and outer layer among materials, the gradient structural concrete member (GSCM) and general single-layer concrete member would be prepared. The Deformation coordination capacity, chloride transport properties, and preparation method were investigated, through simulation of stress and deformation, interface bond strength test, and accelerated corrosion test. Results showed that the consistent volume deformation of GSCM did not cause failure, and the surface layer strength of GSCM improved by up to 30%. Only 0.02-0.05 mm cracks were observed without the aid of instruments, and 0.2-0.5 mm cracks were observed in general single-layer members. Moreover, the GSCM had a depth of penetration and chloride diffusion coefficient of 0mm and 6.3×10^-13m²/s, respectively. These values indicated that the GSCM exhibited good tricyclic assemble performance and satisfied the construction requirement. Meanwhile, the values obtained for the general single components were 15mm and 12.8×10^-13 m²/s.

Key words： bridge engineering design of gradient structure numerical simulation performance analysis concrete component harsh environment.

Received: 27 June 2017

Fund:Supported by the National Science Foundation of China (No.51569035); Zhejiang Provincial Young and Middle-Aged Academic Leaders' Climbing Project (No.pd2013426); and Zhejiang Province Natural Science Foundation (No.LY15E080014)

Corresponding Authors: WEN Xiao-dong E-mail: wenxiaodong@nbut.cn

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	WEN Xiao-dong
	HU Dong-yuan
	ZHANG Zhen-ya
	ZHAO Li

Cite this article:

WEN Xiao-dong,HU Dong-yuan,ZHANG Zhen-ya, et al. Design, Preparation, and Performance of a Gradient Structural Concrete Member[J]. Journal of Highway and Transportation Research and Development, 2018, 12(1): 67-74.

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http://manu27.magtech.com.cn/Jwk_gljtkj_en/EN/ OR http://manu27.magtech.com.cn/Jwk_gljtkj_en/EN/Y2018/V12/I1/67

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