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首页> 外文期刊>Corrosion >Corrosion of Epoxy-Coated Rebar in Marine Bridges-Part 2: Corrosion in Cracked Concrete
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Corrosion of Epoxy-Coated Rebar in Marine Bridges-Part 2: Corrosion in Cracked Concrete

机译：船用桥梁中的环氧涂层钢筋的腐蚀-第2部分：开裂混凝土中的腐蚀

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The extent of corrosion of epoxy-coated rebar (ECR) in marine bridges was found to be generally correlated with concrete chloride diffusivity, D^sub App^, with significant corrosion observed for bridges with D^sub App^ values reaching up to ~10^sup -7^ cm^sup 2^/s but not for sound concrete locations in bridges with D^sub App^ approaching the order of 10^sup -9^ cm^sup 2^/s. However, significant ECR corrosion was observed in several preexisting cracked concrete locations of a low D^sub App^ bridge after only ~15 years of service. Well-manifested, enhanced chloride and moisture penetration took place through the preexisting cracks of this bridge. The corrosion products in that case were solid and grew underneath the epoxy coating and had a composition consistent with that of chloride-substituted Akaganéite (β-FeO[OH]). Laboratory experiments showed that oxygen presence was not necessary for the formation of similar corrosion products, suggesting that corrosion damage could develop even with thin, moisture-filled cracks that would restrict oxygen flow to the corroding region. Other surveyed low D^sub App^ bridges built with ECR showed also preferential chloride penetration at cracks, but no corrosion. An initial model formulation is introduced that may serve as a starting point for quantitative corrosion forecasting of possible damage in those other bridges. Exploratory projections indicate that, as expected, relatively isolated preexisting cracking should only create topical concrete damage with limited maintenance requirements. However, if the preexisting crack orientation with respect to the rebar were adverse and chloride transport were greatly enhanced (as it could be expected in relatively wide cracks), projected corrosion damage was more substantial. [PUBLICATION ABSTRACT]
机译：已发现船用桥梁中的环氧涂层钢筋（ECR）的腐蚀程度通常与混凝土氯化物扩散率D ^ sub App ^有关，对于D ^ sub App ^值高达〜10的桥梁，其腐蚀明显。 ^ sup -7 ^ cm ^ sup 2 ^ / s，但不适用于D ^ sub App ^接近10 ^ sup -9 ^ cm ^ sup 2 ^ / s的桥梁中的声音具体位置。但是，仅使用了约15年，在低D ^ sub App ^桥梁的几个已有的开裂混凝土位置中观察到了明显的ECR腐蚀。通过该桥先前存在的裂缝，可以很好地体现出氯化物和水分的渗透能力。在这种情况下，腐蚀产物是固态的，并在环氧涂层下生长，其组成与氯化物取代的赤铁矿（β-FeO[OH]）一致。实验室实验表明，氧的存在对于形成类似腐蚀产物不是必需的，这表明即使出现细小，充满水分的裂纹也会腐蚀腐蚀，从而限制氧气流向腐蚀区域。其他使用ECR建造的经调查的低D ^ sub App ^桥梁也显示出氯化物在裂纹处优先渗透，但无腐蚀。引入了初始模型公式，该公式可以用作定量预测那些其他桥梁中可能损坏的腐蚀的起点。探索性的预测表明，正如预期的那样，相对孤立的预先存在的裂缝仅会在维护需求有限的情况下造成局部混凝土损坏。但是，如果预先存在的相对于钢筋的裂纹取向不利，并且氯化物的传输大大增强（这在相对较宽的裂纹中是可以预期的），则预计的腐蚀破坏会更大。 [出版物摘要]

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    《Corrosion》 |2010年第6期|p.1-16|共16页
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    K Lau A A Sagüé R G Powers;

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    K. Lau,*' A.A. Sagüés,* and R.G. Powers**Submitted for publication December 18, 2009, in revised form, February 24, 2010. Part 1 of this manuscript appears in Corrosjon 66, 6 (2010), p. 065001-1 to 065001-13.[double dagger] Corresponding author. E-mail: klau@mail.usf.edu.* Department of Civil and Environmental Engineering. University of South Florida. 4202 E. Fowler Ave. ENBl 18, Tampa, FL 33620.** State Materials Office, Florida Department of Transportation, 5007 NE 39th Ave., Gainesville, FL 32609. Present address: Rodney G. Powers and Associates, 3932 NW 43rd Court, Gainesville, FL 32606.,;

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