Effect of Silica Fume and Steel Fiber on Chloride Ion Penetration and Corrosion Behavior of Concrete

• Main Authors: Yung-Fang Lin, 林永芳
• Other Authors: Ran Huang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/31116156530366019777

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 95 === This project is aimed to evaluate the chloride permeability and corrosion behavior of cement-based composites which comprise fibers and silica fume in the mixes. Material variables include water-cementitious ratio, dosage of silica fume, steel fiber length and dosage. Resistivity, polarization resistance, ponding and rapid chloride penetration tests were conducted. The resistivity and polarization resistance are almost the same for steel fiber composites with fiber length of 35 mm and 60 mm, respectively. The resistivity decreases but the open circuit potential and polarization resistance increases with increasing fiber content. The specimens containing silica fume have higher resistivity, open circuit potentials and polarization resistance than the control specimens. Incorporation of steel fiber and silica fume in composites achieves significantly higher increase in polarization resistance than only use of steel fiber or silica fume. The penetration depth decreases with increasing steel fiber content. The specimens containing silica fume have lower total charge passed than the control specimens. The specimens containing silica fume and steel fiber demonstrate better resistance in chloride penetration than steel fiber composites or silica fume composites. The total charge passed is not suitable to evaluate the chloride penetration due to steel conductivity. Open circuit potential and polarization resistance, and chloride penetration depth and polarization resistance are fairly correlated.