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PROTECTION OF REINFORCEMENT WITH CORROSION INHIBITORS, PHASE II.
| 题名： | PROTECTION OF REINFORCEMENT WITH CORROSION INHIBITORS, PHASE II. |
| 作者： | Goodwin-Paul-D; Frantz-Gregory-C; Stephens-Jack-E |
| 关键词： | Admixtures-; Alkali-metals; Alkenyl-substituted-succinic-acid; Ammonium-slats; Corrosion-; Corrosion-protection; Corrosion-tests; Deicing-chemicals; Inhibitors-Chemistry; Laboratory-tests; Performance-evaluations; Reinforced-concrete-bridges; Reinforced-concrete-pavements; Sodium-chloride; Wetting-and-drying-tests |
| 摘要： | Costs due to corrosion of reinforcement in concrete caused by deicing salts have been estimated at up to $1 billion per year in the U.S. alone. For most situations, corrosion-inhibiting admixtures offer significant advantages over other protection methods to delay initiation of corrosion for the service life of the structure. Phase II of this project continued the evaluation of two new corrosion inhibiting chemicals, described as alkali metal and ammonium slats of an alkenyl-substituted succinic acid. Tests compared them with two commercial corrosion-inhibiting admixtures as well as with a typical air-entrained control concrete. Corrosion testing consisted of weekly wetting (with salt solution) and drying cycles applied to slab type specimens and to 2-in. and 3-in. diameter lollipop specimens. Lollipops with a longitudinal saw-cut or with a preformed longitudinal "crack" were also tested. Linear polarization techniques measured corrosion rates. Reinforcing bars were removed and visually examined at completion of testing. Other test results included compression strength, absorption, setting time, and chloride penetration. The new chemicals produced significant improvements in corrosion protection compared with the control concrete and with the two commercial inhibitors. After about 24 months of corrosion monitoring, specimens with the two prototype chemicals showed no sign of corrosion. For specimens with a saw-cut or preformed crack, the chemicals produced greatly reduced amounts of reinforcement corrosion. |
| 总页数： | 2000/12. pp137 (Figs., Tabs., 52 Ref., 2 App.) |
| 报告类型： | 科技报告 |
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