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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5419


    Title: 地電法應用於混凝土中鋼筋鏽蝕研究;Inspecting corrosion rebar in concrete structures by using geoelectical methods
    Authors: 劉衍宏;Yean-horng Liu
    Contributors: 地球物理研究所
    Keywords: 鏽蝕鋼筋;自然電位;透地雷達
    Date: 2001-07-20
    Issue Date: 2009-09-22 09:53:39 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 鏽蝕鋼筋會在混凝土結構物中造成結構物生命週期的縮短,並且會造成損害。所以在災害發生前的鋼筋鏽蝕檢測是非常重要的一件事。本文利用直流電阻法,透地雷達法,與自然電位法來檢測鋼筋鏽蝕狀況。特別使用了不同的電極材料來量測鋼筋鏽蝕狀況。 以下是得到的幾點結論 1.鏽蝕的鋼筋的自然電位值會明顯的比未鏽蝕的鋼筋高。 2.混凝土中含氯離子的濃度也會對自然電位的改變造成部分的影響,含高濃度氯離子的混凝土的自然電位值大概是5 mv左右,不含氯離子的的混凝土的自然電位值介於670 mv左右。 3.電位極與鏽蝕鋼筋混凝土表面的接觸點,,會對實驗所量測的自然電位值有些許的不同與變化。 4.電極的材質不同所造成的金屬極化造成在量測之中,自然電位的改變與異常非常顯著。 5.用透地雷達找鋼筋位置是最方便有效的方法,使用高頻的電磁波,利用金屬對電磁波的特性,可以在雷達剖面上找到繞射的訊號,即是鋼筋所在的位置。 6.直流電阻法的應用於鋼筋混凝土上的效果並不是非常的好,在一般正常的鋼筋混凝土中,因為混凝土的電阻率很高,現今使用的地電儀的電流不夠小,在本實驗中只獲得鏽蝕鋼筋混凝土的自然電位值。 Corrosion rebar in a concrete structure may affect the life of the structure and is a potential source of a disaster. Therefore, it is very important to detect the condition of corrosion rebar embedded in the concrete structure before the disaster happens. This paper try to use the well-known direct current (DC) resistivity, ground penetrating radar (GPR) and spontaneous potential (SP) methods to evaluate the ability of detection the corrosion rebar embedded in concrete models. Emphasis on the ability of detection the corrosion rebar with different electrodes. Based on the model studies, some conclusions can be drawn as following: 1.SP values seem to be higher for corrosion rebar than that of non-corrosion rebar. 2.The SP value associates with the concentration of in a corrosive damage concrete specimen. A SP value of 5 mv is for high contration of while that of 670 mv for a non-damage specimen. 3.The condition of contact between electrode and surface of specimen does affect the measured SP values. 4.Different kinds of electrodes have different SP values. Especially the polarization of metal-electrodes will seriously affect the finally measured SP values. 5.The location of the reber embedded in concrete can be determined accurately by ground penetrating radar. 6.At the concrete surface, using direct current resistivity method is not an effective method to detect corrosive damage concrete.
    Appears in Collections:[地球物理研究所] 博碩士論文

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