摘要
基于对预应力锚固结构腐蚀影响因素的分析,选取pH值、时间、应力水平及材质作为影响预应力锚固结构腐蚀的主要因素进行分析,并对各因素正交组合后进行预应力杆件的室内加速腐蚀试验。得到预应力锚固结构在腐蚀介质作用下的外观规律性表现,并分析影响预应力锚固结构腐蚀的各种因素对于单位长度腐蚀量及断面损失率等指标的影响规律。试验结果表明,随pH值的增大,单位长度腐蚀量呈现出递减趋势,总体呈负指数形式发展;而随着时间的延长,腐蚀量不断增加,但腐蚀量增量逐渐减小,呈幂函数形式发展,而应力水平对于单位长度腐蚀量的影响并不显著。所得到的拟合公式能够正确地反映单位长度腐蚀量与各因素之间的关系,也为工程中预应力锚固结构使用寿命的预测奠定了理论基础。
Based on the analysis of corrosion influence factors of prestressed anchorage structure, the pH value, time, stress level and material are chosen to be the main factors that can affect the corrosion characteristic of prestressed anchorage structure. By adopting the designing method of orthogonal combination about aforementioned factors, the indoor accelerated corrosion tests of prestressed bars have been carried out. From the experiment, the regular appearance of prestressed anchorage structure subjected to corrosion medium is obtained; and the influence laws of various factors on the corrosion weight per unit length and the section loss rate of prestress bars are also analyzed. Conclusions can be drawn as follows： with the increase ofpH value, the corrosion weight per unit length shows decline trend in the form of negative exponent; on the other hand, with the passage of time, the corrosion weight per unit length presents continuously increasing trend in the form of power function, but the increment of corrosion weight decreases gradually; and the stress level has no significant influence on corrosion weight per unit length of prestressed bar. The fitting formulae obtained from the indoor accelerated corrosion test can correctly reflect the relationship of corrosion weight per unit length and various factors; and also it lays the theoretical foundation for the lifetime prediction of prestressed anchorage structure in various projects.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第8期1626-1633,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
山东省交通厅资助项目(2005y002)
关键词
岩石力学
预应力锚固结构
腐蚀
影响因素
试验研究
rock mechanics
prestressed anchorage structure
corrosion
influential factors
experimental study
