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A Study on Accelerated Corrosion Test by Combined Deteriorating Action of Salt Damage and Freeze-Thaw

机译：盐害与冻融相结合的劣化作用加速腐蚀试验研究

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In this study, the accelerated corrosion test by combined deteriorating action of salt damage and freeze-thaw was investigated. freeze-thaw cycle is one method for corrosion testing; corrosion initiation time was measured in four types of concrete samples, i.e., two samples mixed with fly ash (FA) and blast furnace slag (BS), and the other two samples having two water/cement ratio (W/C = 0.6, 0.35) without admixture (OPC60 and OPC35). The corrosion of rebar embedded in concrete occurred most quickly at the 30th freeze-thaw cycle. Moreover, a corrosion monitoring method with a half-cell potential measurement and relative dynamic elastic modulus derived from resonant frequency measures was conducted simultaneously. The results indicated that the corrosion of rebar occurred when the relative dynamic elastic modulus was less than 60%. Therefore, dynamic elastic modulus can be used to detect corrosion of steel bar. The results of the accelerated corrosion test exhibited significant difference according to corrosion periods combined with each test condition. Consequently, the OPC60 showed the lowest corrosion resistanceamong the samples.
机译：在这项研究中，结合盐破坏和冻融的恶化作用，进行了加速腐蚀试验。冻融循环是腐蚀测试的一种方法。测量了四种混凝土样品的腐蚀开始时间，即两种样品掺有粉煤灰（FA）和高炉矿渣（BS），另两种样品具有两种水灰比（W / C = 0.6，0.35 ），而无需掺加（OPC60和OPC35）。在第30次冻融循环中，埋在混凝土中的钢筋腐蚀最快。此外，同时进行了腐蚀监测方法，该方法具有半电池电位测量和从共振频率测量得出的相对动态弹性模量。结果表明，当相对动弹性模量小于60％时，钢筋发生腐蚀。因此，动态弹性模量可用于检测钢筋的腐蚀。加速腐蚀试验的结果根据腐蚀时间和每种试验条件的不同表现出显着差异。因此，OPC60在样品中显示出最低的耐腐蚀性。

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