Abstract
The selection of corrosion test method in the corrosion study of the prestressed anchors is an important issue. In this paper, the corrosion test of anchors was conducted with electrolytic corrosion test method. The corrosion characteristics of the anchor cables were examined. The effects of sodium chloride solution concentration, current, test time, and prestress level on corrosion were studied. The applicability of electrolytic corrosion method in anchor cable corrosion study is discussed subsequently. The results show that the corrosion of the anchor appears to be uniform corrosion. With the corrosion of the anchor, the central wire of the cable was basically not corroded, and the cross-sectional shape of the outer wire changes from a round to fan shape. The sodium chloride concentration and prestress level have no obvious effects on the corrosion of the anchor. The variation of test time does not affect the difference between the measured and theoretical calculated results, while a proper current in the electrolysis test may help reduce the difference. The measured corrosion rate fluctuates from −4% to 10% and tends to be higher compared with calculated results based on Faraday’s law. The study indicates that the electrolytic corrosion test is applicable in the anchor corrosion study.
Highlights
With the abundant applications of rock anchors in water conservancy, bridge, and mining projects, the deterioration of the anchor cables caused by corrosion has become an issue of concern [1,2,3,4,5]. e corrosion of anchor cables may induce serious problems such as the loss of anchor’s locked force which may diminish the anchor’s function. e corrosion of anchors can incur the fracture of the grout and the damage of the anchor system, which may lead to the destruction and even failure of the structure. erefore, studying the corrosion characteristics and development laws of anchor cables has great significance
Where I is the current (A), t is the time (s), F is the Faraday constant which equals 96487 C/mol, and n is the molar mass of Fe which is about 55.845 g/mol. erefore, the corrosion rate of the samples in the test can be calculated based on the current and test time in the tests
As shown in the table, 94% of the measured corrosion rate is greater than the calculated value based on Faraday’s law, suggesting that the corrosion rate measured in the test tends to be higher
Summary
With the abundant applications of rock anchors in water conservancy, bridge, and mining projects, the deterioration of the anchor cables caused by corrosion has become an issue of concern [1,2,3,4,5]. e corrosion of anchor cables may induce serious problems such as the loss of anchor’s locked force which may diminish the anchor’s function. e corrosion of anchors can incur the fracture of the grout and the damage of the anchor system, which may lead to the destruction and even failure of the structure. erefore, studying the corrosion characteristics and development laws of anchor cables has great significance.Corrosion tests of metals are effective ways for investigating the corrosion of steels in engineering structures, while the selection of an appropriate corrosion test for the anchors with different study purposes is an issue worth studying. Anchor cable corrosion tests include field tests and laboratory tests. One is to excavate and acquire anchor cables that have serviced for a certain number of years [1, 2], and the other is to conduct on-site corrosion tests in the field with the artificial environment created to simulate the actual working conditions of anchor cables [3]. Field tests can obtain the most directly actual conditions of the anchor cable corrosion, such problems as high cost and long time. Laboratory corrosion tests, including artificial climate method, immersion corrosion method, and salt spray method, were widely performed by researchers in corrosion studies [4,5,6,7,8]
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