梯度结构混凝土构件的设计、制备与性能评价

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摘要 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.

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	温小栋
	胡东源
	张振亚
	赵莉

关键词 ： bridge engineering, design of gradient structure, numerical simulation, performance analysis, concrete component, harsh environment.

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.

收稿日期: 2017-06-27

基金资助: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)

通讯作者: WEN Xiao-dong E-mail: wenxiaodong@nbut.cn

引用本文:

温小栋, 胡东源, 张振亚, 赵莉. 梯度结构混凝土构件的设计、制备与性能评价[J]. Journal of Highway and Transportation Research and Development, 2018, 12(1): 67-74.
WEN Xiao-dong, HU Dong-yuan, ZHANG Zhen-ya, ZHAO Li. Design, Preparation, and Performance of a Gradient Structural Concrete Member. Journal of Highway and Transportation Research and Development, 2018, 12(1): 67-74.

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