00795322

Component

A total of 16 reinforced slabs were cast with admixed chloride contents of 0.0, 0.35, 0.71, 1.4, 2.8, and 5.7 kg Cl/cu m of concrete. The slabs contained 5 isolated steel reinforcing bars with a 50 mm cover depth and were 1181 x 1067 x 216 mm. The slabs were stored at an outdoor exposure site in Blacksburg, Virginia for 7 years before being treated with an alcohol-amine corrosion inhibitor. Treatments were 3 applications at a rate of 2.46 sq m/liter over the entire surface area or over a center strip which was perpendicular to the bar direction. The concrete mixture had a water cement ratio of 0.45 and a 28 day compressive strength of 34.5 MPa. Corrosion assessment measurements before treatment included acid and water soluble chloride contents and corrosion potentials and rates. Corrosion potentials and rates were monitored for 1 year after treatment, and about 9 months after treatment the depth of inhibitor penetration was measured qualitatively (color indicator test) and quantitatively (ppm). Results indicated that the inhibitor penetrated to the bar depth but there was no significant difference in the corrosion potentials and rates between the treated and untreated slabs or areas.

Session D

English

18p

2000

Ninth AASHTO/TRB Maintenance Management Conference

Figures (10) ; References (3) ; Tables (2)

Chloride content; Corrosion; Corrosion protection; Inhibitors (Chemistry); Reinforced concrete; Reinforcing bars; Slabs; Steel; Weathering

Bridges and other structures; Design; Highways; Maintenance and Preservation; I24: Design of Bridges and Retaining Walls; I60: Maintenance

TRIS, TRB

Jul 18 2000 12:00AM

• EXTENDED CORROSION PERFORMANCE OF AN IMPREGNATION-TREATED CONCRETE BRIDGE DECK
• RAPID REHABILITATION OR REPLACEMENT OF BRIDGE DECKS UNDER CONCURRENT TRAFFIC CONDITIONS