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Carbonation Processes in Submerged Concrete in a Simulated CO2 Invasive Fish Barrier System.
| 题名： | Carbonation Processes in Submerged Concrete in a Simulated CO2 Invasive Fish Barrier System. |
| 作者： | Moser, R. D.; Johnson, T. R.; Madden, M. C.; Weiss, C. J. A.; Long, W. R.; McKechnie, M. A.; Smith, D. L. |
| 关键词： | Concrete, Carbon dioxide, Simulations, Fish, Scanning electron microscopy, Compressive strength, Calcium hydroxide, Microstructure, Fly ash, Acid-base indicators, Corrosion, Carbonation, Hydrogen-ion concentration fish barrier, Concrete corrosion, Concrete--deterioration, Lock, Deterioration, Concrete hydraulic structures |
| 摘要： | This study focused on examining the susceptibility of three concrete materials to carbonation-induced deterioration in a simulated CO2 chemical fish barrier system. The concrete materials tested were modeled after concretes and aggregate mineralogies used in civil works structures. The exposure conditions consisted of 74 mg/L and 225 mg/L concentrations of CO2 in an aqueous solution maintained at both 21C and 40C. Visual examination and pH indicator solutions were used to monitor the progression of any deterioration in specimens during the experiment. Surface deterioration was not observed until 90- and 180-day measurements. Characterization performed on affected materials and surface deterioration products indicated that the damage was induced by carbonation mechanisms with Ca2 leaching from the concrete microstructure reacting with CO2 in solution. These processes were limited to the top 1 mm of the concrete, even at 180 days with any severe microstructural alteration and changes in pH limited to 100-200 m of depth. The primary conclusion from this Phase 1 study is that carbonation-induced deterioration can occur in the simulated fish barrier environment, but the rates of carbonation are not of concern and are similar to those that would be expected for concrete exposed to normal atmospheric conditions and CO2 concentrations. |
| 报告类型： | 科技报告 |
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