外文翻譯--混凝土中鋼腐蝕的有關(guān)問題(存儲(chǔ)版)
【正文】 (icorr)和電耦合 (ig)在包裹在 圖 icorr和 Ecorr 不含有氯化物砂漿里的鋼腐蝕中的相對(duì)意義。 什么是在鋼筋混凝土結(jié)構(gòu)中大電偶和腐蝕微電池對(duì)的相對(duì)重要性？ 根據(jù)一些作者 [3,5]，極化電阻作用為估計(jì)鋼筋混凝土中腐蝕速度提供了一個(gè)有效的方法；這個(gè)方法是非?？臁⒎奖?、非破壞性、適量和相當(dāng)精確的。電偶是由特殊設(shè)計(jì)的試塊確定的，如圖 1 和 2 所示。這些回答需要試驗(yàn)得出，大部分都由作者們得出。 and 5) the best corrosion measurement and control methods. The responses provided are supported by experimental results, most of which were obtained by the authors themselves. 1. INTRODUCTION Concreteembedded steel is known to remain in apassive state under normal conditions as a result of the highly alkaline pH of concrete. The passivity of reinforcements ensures unlimited durability of reinforced concrete (1KC) structures. However, there are some exceptional conditions that disrupt steel passivity and cause reinforcements to be corroded in an active state. This has raised controversial interpretations, some of which were discussed in Part I of this series [1]. This Part II analyses though far from exhaustively, other to the authors minds at least equally interesting issues on which no general consensus has been reached. 2. MATERIALS AND METHODS The reader is referred to Part I for a detailed description of the materials and methods used in this work. Most of the experimental results discussed herein were obtained with the same types of specimens and couples were determined on speciallydesigned specimens, such as those shown in Figs. 1 and conditions were simulated by using a beam that was 160cm long and 7 x 10 cm in crosssection. The beam was made from 350 kg cement/m 3, half of which contained no additives, while the other half included 3% CaC12 by cement weight [2], (Fig. 1). In order to study the effect of the Sanod/Scathoa ratio on galvanic macrocouples, they were modelled by surrounding a small carbon steel anode with a stainless steel (AISI 304) cathode and vice versa (Fig. 2). In this way, the ratio39。 4) the possibility of a reliable prediction of the service life of a reinforced concrete structure 。特別是這幾方面： 1)在鋼筋混凝土結(jié)構(gòu)中的大電偶和腐蝕微電池對(duì)的相對(duì)重要性； 2)激活狀態(tài)的鋼筋腐蝕機(jī)理； 3)阻止或停止鋼筋腐蝕最好的保護(hù)方法； 4)一個(gè)鋼筋混凝土結(jié)構(gòu)使用年限的可靠預(yù)測的可能性探索； 5)最好的防腐措施和控制方法。這里所討論的大部分實(shí)驗(yàn)結(jié)果都是從一樣的試塊和平板中得到的。 S 正極 /S 負(fù)極 的作用和腐蝕微電池對(duì)的相對(duì)意義的方案。 圖 3 是估算的 icorr 與 ig值的比較，在砂漿中含有 3%的 CaCl2，每個(gè)正極表面單元體為許多正極 /負(fù)極表面比值作為美國鋼鐵學(xué)會(huì) 304 不銹鋼 /碳素鋼電偶的一部分支持以上結(jié)論。 這個(gè)重要性歸因于氧氣的循環(huán)作業(yè)，它證明這些作用對(duì)確定它在混凝土中的擴(kuò)散率是正確的 [12,13]。 — 當(dāng)混凝土空隙飽和作用降低，混凝土的電阻率控制 icorr 在一個(gè)寬泛的電阻率范圍內(nèi)；因此，腐蝕速度的減小好像與氧氣進(jìn)入結(jié)構(gòu)的難易成反比例 (圖 5)[10]。 圖 。 — 在蝕坑處涂上氫氧化鐵膜的鋼在含有氯化物 的飽和 Ca(OH)2 中極化成陽極時(shí)會(huì)產(chǎn)生氣泡，因?yàn)殡娢坏慕档托枰尫叛鯕狻? 另一方面， ?A/cm2 的 icorr(見第Ⅰ部分圖 9)[4]已經(jīng)由一些作者從含氯化物的砂漿或碳酸鹽砂漿與氧氣有限的擴(kuò)散流所允許的速度是不協(xié)調(diào)的。 鋼筋腐蝕的機(jī)理是什么？ 當(dāng)鈍化狀態(tài)消失，鋼筋的腐蝕速
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