建立一般大气环境下钢筋开始锈蚀的条件是研究钢筋锈蚀的基础，其实质是确定碳化残量。
Establishment of critical condition of reinforcement corrosion on ordinary atmosphere environment is the basic of studying reinforcement corrosion, it means to determine carbonation remains.
本文以自然大气环境下锈蚀钢结构为研究对象，试验材料均截取自实际工程中锈蚀的型钢。
This paper will study the corroded steel structure in natural atmospheric conditions and test materials are from the practical engineering.
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