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。
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.
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