臺灣博碩士論文加值系統

本論文主要目的是研究混凝土中之鋼筋腐蝕對構件耐久性的影響，建立鋼筋腐蝕預測模型來計算得到鋼筋銹蝕率。首先利用鋼筋腐蝕模型推導出鋼筋銹蝕率，並將能士特-愛因斯坦方程式結合腐蝕機制，考慮不同溫度下鋼筋腐蝕率的變化情形。其次理論解釋三個由Andrade and Alonso[2001]提供的現地量測鋼筋腐蝕速率：(a)使用 的圖表從每年平均電阻率的值可以獲得腐蝕電流的平均值。(b)定義鋼筋橫斷面半徑損失的侵入深度可以由紀錄的腐蝕電流和腐蝕開始之後時間的乘積來表示。(c)有害物質侵入深度(碳化或氯化物的飽和點)的前緣取對數圖對腐蝕開始之後的時間取對數之關係圖。研究結果表明：(1)能士特-愛因斯坦方程式結合腐蝕機制所建立的擴散係數，其溫度參數變化值對整體擴散係數影響不大，但對碳化較嚴重的區域和保護厚度較薄的鋼筋混凝土結構物時，溫度影響就會非常明顯。(2)每年具代表性的腐蝕電流值結合天氣情況可以正確地測量現地的腐蝕電流和鋼筋橫斷面的損失。




關鍵字： 腐蝕模型、銹蝕率、碳化、氯化物

The main purpose of this article was studying the corrosion of steel in concrete which impacted on structure durability, and establishing the corrosion prediction model of steel to calculate the corrosion rate of steel. Firstly, deriving the steel corrosion rate using the corrosion model and the Nernst-Einstein equation in combination with corrosion mechanism is to consider the change of steel corrosion rate with different temperatures. Secondly, theoretical elucidation for the three on-site measurements of corrosion rate of reinforcements provided by Andrade and Alonso [2001]：(a)The average value of the corrosion current can be obtained from the values of yearly average resistivity using the graph of . (b) The attack penetration of steel in concrete defined as the loss in cross radius is expressed by the product recorded corrosion current and the time after corrosion started, and (c) The log of penetration depth of (carbonation or chloride threshold) aggressive front is plotted versus the log of the time after corrosion started. The present results of these studies were shown as follows: (1) The variance of temperature parameter of the diffusion coefficient derived by the Nernst-Einstein equation in combination with corrosion mechanism is not influenced to the whole diffusion coefficient. Nevertheless, the temperature influence is very obvious when the RC structure is located in the severe region of carbonation and is of thin cover thickness. (2) The yearly representative value of corrosion current in combination with the weather condition can be measured correctly the corrosion current on-site and the loss in bar cross section.
Keywords：corrosion model, corrosion rate, carbonation, chloride

中文摘要 I
英文摘要 II
謝誌 III
目錄 VI
表目錄 V
圖目錄 IX
符號說明 XII

第一章 緒 論 1
1.1 研究動機 1
1.2 研究目的 1
1.3 研究方法 2
1.4 研究內容 3
第二章 能士特-愛因斯坦方程式在混凝土中鋼筋銹蝕率預測模 4
型之應用
2.1前言 4
2.2混凝土中鋼筋腐蝕模型 6
2.3混凝土中鋼筋腐蝕模型的驗證與分析 14
2.3.1簡化預測模型的合理性 14
2.3.2鋼筋銹蝕率預測模型的影響因素 15
2.4討論 17
2.5結論 22
第三章混凝土結構中鋼筋銹蝕率的理論解釋 24
3.1 前言 24
3.2腐蝕電流-混凝土電阻率之間的關係 24
3.3應用 值計算鋼筋橫斷面的損失 28
3.4傳遞時期的長度計算 31
3.5 結論 34
第四章 結論與建議 36
4.1 結論 36
4.2 建議 37
參考文獻 55

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