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

J Chin Soc Corr Pro

2010, Vol. 30

Issue (5): 383-390 DOI:

Research Articles

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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

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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

Received: 20 August 2009

ZTFLH:

TU375

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

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ZHAO Yuxi, REN Haiyang. MECHANICAL BEHAVIOR OF THE RUST BASED ON OEDOMETER TEST AND HERTZ CONTACT THEORY. J Chin Soc Corr Pro, 2010, 30(5): 383-390.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I5/383

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