Bridges for Service Life Beyond 100 Years: Innovative Systems, Subsystems, and Components (2014) / Chapter Skim
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Pages 209-224
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209 A p p e n d i x e Background Delaying the onset of corrosion is one of the most important factors determining the service life of a reinforced concrete structure. Corrosion-resistant structures can be achieved by preventing salt from penetrating to the level of the reinforcing steel, by using corrosion-resistant reinforcement, or by using both of these techniques simultaneously.
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210 structures are electrochemical chloride extraction (ECE) and realkalization.
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211 that helps stainless steel resist oxidation. Other metals can be added to increase corrosion resistance.
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212 total cost by 5.5% to 15.6%. Titanium would have increased the total bridge cost by 35% to 90% (McDonald et al.
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213 Test Setup The specimen preparation and testing procedure considered to test the different matrices followed ASTM G109 (ASTM G109 2007a)
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215 3. Wooden forms measuring 11 × 6 × 4.5 in.
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216 was finished with a wood float. Figure E.9 shows samples before and after concrete pour.
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218 to the two bottom bars through a wire and one 100-W resistor. Figure E.13 shows the specimens prepared for the wet–dry cycle.
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219 the summary of labels given to each specimen. Five variables were considered for testing, and three identical specimens for each variable were made to provide statistical significance.
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220 specimens that exceeded the -0.20-V limit. The three specimens were from three groups with black bars with values between -0.20 and -0.30 V, indicating that corrosion activity was uncertain.
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221 Table E.2. Measured Electrical Current Time BB1 BB2 BB3 ECL1 ECL2 ECL3 ECH1 ECH2 ECH3 SS1 SS2 SS3 Ti1 Ti2 Ti3 Day µA µA µA µA µA µA µA µA µA µA µA µA µA µA µA 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 50 -0.07 -0.06 -0.065 -0.06 -0.02 -0.055 -0.05 -0.025 -0.05 -0.035 -0.02 -0.025 -0.01 -0.015 -0.02 302 -0.095 -0.09 -0.1 -0.08 -0.07 -0.075 -0.045 -0.04 -0.04 -0.04 -0.045 -0.045 -0.04 -0.045 -0.04 308 -0.13 -0.09 -0.09 -0.08 -0.055 -0.07 -0.04 -0.045 -0.035 -0.02 -0.02 -0.04 -0.04 -0.03 -0.035 312 -0.12 -0.08 -0.08 -0.07 -0.07 -0.065 -0.04 -0.04 -0.035 -0.05 -0.065 -0.045 -0.04 -0.04 -0.035 336 -0.055 -0.05 -0.04 -0.055 -0.035 -0.045 -0.025 -0.02 -0.02 -0.015 -0.015 -0.02 -0.025 -0.035 -0.03 340 -0.05 -0.05 -0.04 -3.6 -0.035 -0.04 -0.03 -0.025 -0.025 -0.015 -0.01 -0.02 -0.03 -0.03 -0.03 344 -0.06 -0.05 -0.055 -8.7 -0.045 -0.05 -0.035 -0.025 -0.02 -0.045 -0.025 -0.025 -0.04 -0.04 -0.03 350 -0.06 -0.06 -0.06 -10.6 -0.04 -0.05 -0.02 -0.035 -0.02 -0.02 -0.015 -0.02 -0.025 -0.035 -0.03 354 -0.06 -0.05 -0.055 -11.5 -0.06 -0.05 -0.025 -0.02 -0.03 -0.025 -0.02 -0.02 -0.025 -0.06 -0.03 358 -0.1 -0.1 -0.08 -11.8 -0.06 -0.065 -0.03 -0.035 -0.03 -0.03 -0.03 -0.02 -0.03 -0.07 -0.025 375 -0.1 -0.1 -0.08 -10.3 -0.06 -0.065 -0.03 -0.035 -0.03 -0.03 -0.03 -0.02 -0.03 -0.07 -0.025 403 -0.6 -0.6 -11.4 -7.5 -0.3 -0.2 -0.2 -0.2 -2.2 -0.6 -0.1 -0.1 -0.1 -0.2 -0.3 424 -0.8 -0.1 -8.3 -5.4 -0.3 -0.3 -0.3 -0.2 -3.8 -0.18 -0.28 -0.34 -0.35 -0.37 -0.4
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