MECHANICAL BEHAVIOR OF THE RUST BASED ON OEDOMETER TEST AND HERTZ CONTACT THEORY
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. The natural rust and the 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. The experimental results show that the modulus of rust increased with the load increasing, the rust is not a linear elastic material behavior. The rust samples with different sizes have different mechanical properties, the modulus of rust decreases with the increase of its volume. The natural rust and the electrochemical steel corrosion have different mechanical properties;therefore, the investigation of natural rust can not be replaced by that of the electrochemical corrosion products.
rust oedometer test Hertz contact theory mechanical behavior
Haiyang REN Yuxi ZHAO Weiliang JIN
Structural Engineering Institution, Zhejiang University, China
国际会议
The Second Asia-Pacific Young Researchers and Graduates Symposium(第二届亚太地区结构青年专家研讨会)
杭州
英文
131-140
2010-03-27（万方平台首次上网日期，不代表论文的发表时间）