Evaluation of two corrosion inhibitors using two surface application methods for reinforced concrete structures
By: Stephen R. Sharp.
Contributors: Virginia Transportation Research Council.; Virginia. Dept. of Transportation.
Series: VTRC ;; 05-R16; VTRC (Series) ;; 05-R16.
Publisher: Virginia Transportation Research Council
Published: 2004
Place of publication: Charlottesville, Va
Language: eng
Number of pages: 28
Subjects: Reinforced concrete -- Corrosion -- Testing; Reinforcing bars -- Corrosion -- Testing; Bridges, Concrete -- Floors -- Corrosion -- Prevention; Corrosion resistant materials; Corrosion tests
Description: This study investigated the use of penetrating corrosion inhibitors to extend the life of existing reinforced concrete bridge decks. The use of assisted (vacuum/pressure injection) and unassisted (diffusion) treatment methods and two inhibitors were evaluated. The inhibitors were FerroGard 903, from Sika Corp., and TPS-II, from Surtreat International. Testing was performed on exposure slabs with 15 lb/yd3 of NaCl in the top layer and no NaCl in the bottom layer. The slab design was a variation of the specimen design provided in ASTM G109, with each slab containing nine steel reinforcing rods instead of three. The exposure slabs had either a uniform cover over the top pieces of steel or an inclined cover over the steel. TPS-II was also evaluated on the deck of a bridge in Orange County, Virginia. The study found that when applied to the concrete surface, neither inhibitor penetrated the concrete to reach the steel reinforcement. The vacuum/pressure injection method showed promise but requires refinement. In addition, based on macro-cell measurements, a sufficient quantity of inhibitor can be injected into the concrete to reduce the charge passed.
Notes: Includes bibliographical references (p. 26-28).
"December 2004."
Performed by Virginia Transportation Research Council for Virginia Department of Transportation under project no. 68625
Also available online (Adobe Acrobat Reader required) via the Virginia Transportation Research Council website http://www.virginiadot.org/vtrc/main/index%5Fmain.htm.
Final report; July 1, 2003-Nov. 30, 2004.