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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/14229

Title: 陰極防蝕技術應用於含氯鋼筋混凝土之研究
The Application of Cathodic Protection on the chlorine Reinforced Concrete
Authors: Wern-Jier Tseng
Contributors: NTOU:Department of Harbor and River Engineering
Keywords: 陰極防蝕;鋼筋混凝土
Cathodic Protection;Reinforced Concrete
Date: 2003
Issue Date: 2011-06-30T07:34:51Z
Abstract: 在海洋環境下,鋼筋混凝土構造物受氯離子之侵蝕常會導致鋼筋的□蝕,進而促使構造物崩裂毀壞。為使構造物之維護及使用年限得以延長,因此本研究經由試驗研究方式,針對已遭受氯離子侵襲之鋼筋混凝土試體,應用陰極防蝕技術,依據鋼筋極化現象之量測及氯離子滴定的結果,藉以探討含氯鋼筋混凝土構造物防蝕所需之最佳外加電流密度及所達成的去氯成效。 為模擬鋼筋混凝土構造物在不同的抗壓強度及受氯離子侵襲之程度,本研究所設計使用之混凝土試體,水灰比分別採用0.4及0.6兩種;氯離子含量分別包括0.5%及1.0%兩種;外加電流密度分別包括1、10、20、及100 mA/m2等四種;通電時間分別含括1、2、3、及4個月等四種。 試驗研究結果顯示:在鋼筋混凝土試體施加電流密度為1 mA/m2時,鋼筋並無明顯極化現象,而其24小時的電位衰退量最大僅為23mV,依據美國N.A.C.E. International RP290-2000防蝕電位標準研判,鋼筋之防蝕電流密度尚不充足;當施加電流密度達10 mA/m2時,其24小時的電位衰退量已有半數試體大於100 mV,顯見鋼筋已接近達到保護的電流密度;而施加電流密度20與100mA/m2,全數試體24小時之電位衰退量皆己在100 mV以上,顯示已達到保護鋼筋的預期效果。 在去氯成效評估方面,由試驗結果可得:隨著外加電流密度的增加及通電時間的增長,鋼筋混凝土試體內剩餘之氯離子含量會明顯下降,下降量尤其以在鋼筋附近最為顯著,惟最終的去氯成效仍有其一定的限度。此外,若試體之水灰比愈高,則其去氯成效愈佳。 綜合評估可得:為防護鋼筋免於發生腐蝕,其所需施加之最佳電流密度應為10mA/m2~20 mA/m2。
Distension and failure of reinforce concrete structures exposing to marine environments occur frequently due to steel corrosions induced by intrusion of chlorides. To find the physical solutions of protecting such kinds of structures from aggravation corrosions and elongating its lifetime, specimens of reinforce concrete containing with chlorides are prepared and a series of laboratory experiments are implemented in this study. Adopting the cathodic protection technique, both of the optimization density of the imposed current and effects of steel polarization are measured and chloride ion titrate, the de-chloride efficiency is evaluated as well. For the laboratory experiments, specimens of reinforce concrete are prepared with two kinds of water/cement ratio: 0.4 and 0.6, and two kinds of chloride content: 0.5% and 1.0%. and four kinds of current density, consisting of 1, 10, 20, and 100 mA/m2, are imposed to specimens with time of treatment equal to 1, 2, 3, and 4 month, respectively. From the experimental results, the imposed current density is 1 mA/m2, the steel bar decline potential in 24 hours is about 23mV. By the standard of N.A.C.E International RP290-2000 to evaluate the corrosion-prevention potential, the imposed current densities show that the degree of steel polarization is too lower to prevent the steel from corrosions. When the imposed current density increased to 10 mA/m2, the more then half of the specimens are measured exceeding 100 mV. When the imposed current density increased to 20 and 100 mA/m2, the decline potential in 24 hours reaching more then 100 mV for all of the specimens. The facts imply that the steel is polarized significantly and the imposed current density is higher to prevent the steel from corrosions.On the evaluations of de-chloride effects, the measurements show that the residual content of chloride in specimens decreasing and converging to a certain limitation as increasing both of the imposed current density and the desalination time. The regions where appeared with the most significant de-chloride effects are found neighboring to the steel. Moreover, it is found that the higher ratio of water/cement in specimens, the better the de-chloride effects are.Synthetically speaking, for steel corrosion control the imposed optimum current density of about 10 mA/m2~20 mA/m2 is proposed.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0T91450015
Appears in Collections:[河海工程學系] 博碩士論文

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