META ANALYSIS THE EFFECTS OF W / C RATIO TO ESTIMATED REMAINING LIFE OF REINFORCED CONCRETE DUE TO CORROSION
Buildings located close to the beach, such as bridges or docks, are susceptible to corrosion due to chloride attacks. When concrete reinforcement is corroded, there are many effects on the strength and serviceability of concrete components. This is because corrosion that occurs in concrete reinforce...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/39972 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Buildings located close to the beach, such as bridges or docks, are susceptible to corrosion due to chloride attacks. When concrete reinforcement is corroded, there are many effects on the strength and serviceability of concrete components. This is because corrosion that occurs in concrete reinforcement can cause spalling in the concrete, reducing the effective area of reinforcing steel because it changes to rust, decreases the bond between concrete and steel reinforcement, and others.
In theory, concrete quality such as W/C ratio, the use of additional minerals such as silicafume, fly ash, slag or other materials affect the volume of pores present in concrete, and this will affect the diffusion coefficient of chloride in concrete. This diffusion coefficient will affect the rate of penetration of chlorides that make corrosion occur in reinforced concrete. Therefore, the chloride diffusion coefficient is one of the important characteristics to consider in predicting the remaining service life of concrete buildings which are corroded due to chloride penetration.
In this study, a meta-analysis was conducted to find out how the of w/c ratio influence remaining service life estimation of concrete buildings that were corroded due to chloride penetration. The meta-analysis was carried out using a considerable amount of data drawn from previous studies related to w / c ratio and diffusion coefficient, then applying statistical procedures to find out the relationship between w / c ratio and diffusion coefficient. The obtained relationship between w / c ratio and the diffusion coefficient is then associated with predictions of service life based on the time of corrosion initiation and the time of first cracking due to corrosion. The time of corrosion initiation was obtained by applying the second Fick diffusion law, while the time to first crack was obtained using the empirical equation proposed by K.C. Clear (1976).
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