基于固结试验和接触理论分析的铁锈力学性能

中国腐蚀与防护学报

2010, Vol. 30

Issue (5): 383-390

研究报告

本期目录 | 过刊浏览

基于固结试验和接触理论分析的铁锈力学性能

赵羽习¹,任海洋^1,2

1. 浙江大学结构工程研究所杭州 310058
2. 中国水电顾问集团华东勘测设计研究院杭州 310014

MECHANICAL BEHAVIOR OF THE RUST BASED ON OEDOMETER TEST AND HERTZ CONTACT THEORY

ZHAO Yuxi¹, REN Haiyang^1,2

1. Institute of Structure Engineering，Zhejiang University，Hangzhou 310058
2. HydroChina HuaDong Engineering Corporation, Hangzhou 310014

全文: PDF(1021 KB)

摘要: 选取自然锈蚀、电解锈蚀两种锈蚀产物颗粒作为研究对象，采用X射线衍射(XRD)、显微镜观测等方法研究两者物理性能上的差异。通过改进的固结试验方法，同时引入Hertz弹性接触理论，对不同粒径的不同锈蚀产物进行不同荷载作用下的模量分析计算，得到了不同荷载与铁锈模量之间的关系，表明铁锈不是线弹性物质，铁锈模量随荷载呈线性增加趋势。在试验结果基础上，还考虑尺寸效应影响，提出了自然锈蚀产物颗粒的内部损失表达式，并对自然锈蚀产物颗粒的内部损失进行定量分析，可描述理想无损自然锈蚀产物的力学性能。

关键词 ：锈蚀产物, 固结试验, Hertz接触理论, 力学性能, 尺寸效应

Abstract：Steel corrosion occurs in concrete structures when proper environmental conditions are provided. After steel corrosion initiates, the corrosion products first accumulate at the steel surface, then induce an internal pressure on the surrounding confining concrete, and slowly apply stress to the concrete cover until cracks are initiated at the steel surface spreading towards to the concrete surface. Therefore, corrosion product is the most influential factor during the concrete cracking process due to corrosion. Natural rust and electrochemical steel corrosion were investigated by X-ray diffraction (XRD) and digital optical microscope to differentiate the physical characters of two types of rusts. The oedometer tests were used to analyze the mechanical behavior of the powder rust samples, the modulus of these two types of rusts were then deduced according to Hertz contact theory. It was observed that the modulus of rust increased with the load increasing. By quantitative analysis of the inner damage constitutive model of natural corrosion products, the scale effect was accounted into the rust modulus model. The mechanical behavior of ideal natural rust was then described.

Key words： rust oedometer test Hertz contact theory mechanical behavior scale effect

收稿日期: 2009-08-20

ZTFLH:

TU375

基金资助:

国家自然科学基金项目(50808157)资助

通讯作者: 任海洋 E-mail: renhaiyang@zju.edu.cn

Corresponding author: ren haiyang E-mail: renhaiyang@zju.edu.cn

作者简介: 赵羽习，1973年生，女，教授，博士，研究方向为混凝土结构耐久性

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引用本文:

赵羽习,任海洋. 基于固结试验和接触理论分析的铁锈力学性能[J]. 中国腐蚀与防护学报, 2010, 30(5): 383-390.
DIAO Hu-Xi, REN Hai-Xiang. MECHANICAL BEHAVIOR OF THE RUST BASED ON OEDOMETER TEST AND HERTZ CONTACT THEORY. J Chin Soc Corr Pro, 2010, 30(5): 383-390.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2010/V30/I5/383

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