Inspecting corrosion rebar in concrete structures by using geoelectical methods

• Main Authors: Yean-horng, 劉衍宏
• Other Authors: 楊潔豪
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/74467672371215324469

碩士 === 國立中央大學 === 地球物理研究所 === 89 === 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.