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CONNECTICUT
TRANSPORTATION INSTITUTE
| 题名： | CONNECTICUT TRANSPORTATION INSTITUTE |
| 作者： | M. Allyn; G.C. Frantz; and J.E. Stephens |
| 关键词： | Bridges (concrete). Corrosion; Corrosion Inhibitors; Durability; Pavements (concrete); and Research |
| 摘要： | Costs due to corrosion of reinforcement in concrete caused by deicing salts has been estimated at up to $1 billion per year in the US 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. Two new prototype corrosion inhibiting chemicals were evaluated and compared 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 both 2-inch and 3-inch diameter lollipop specimens. Some lollipop specimens were also "pre-cracked" prior to corrosion testing. Linear polarization techniques measured corrosion rates. Reinforcing bars were removed and visually examined at completion of testing. Other concrete material test results included compression strength, freeze-thaw resistance, and absorption. Compared with the control concrete and with die two commercial inhibitors, the new corrosion inhibiting chemicals produced significant improvement After about 12 months of corrosion monitoring, "uncracked" specimens with the two prototype chemicals showed no sign of corrosion. "Pre-cracked" specimens, which contained the new chemicals, had very greatly reduced amounts of reinforcement corrosion. |
| 报告类型： | 科技报告 |
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