00602674

Component

http://onlinepubs.trb.org...trr/1990/1268/1268-023.pdf

https://scholar.google.co...holz&publication_year=1990

Lignosulfonates are being used as corrosion inhibitors in highway deicing salts. Corrosion reductions of 50 to 80% have been reported for mild steel. Lignosulfonates act as both cathodic and anodic inhibitors. They remove oxygen from solution, form insoluble material on the corroding surface, and use its reducing ability to prevent oxidation of ferrous iron to ferric. Although lignosulfonates in deicing salts would be expected to protect exposed rebar in concrete, experiments were run to measure corrosion inhibition on rebar exposed by microcracks in concrete, and in undamaged concrete where corrosion occurs by chloride diffusion. Mortar blocks with cracks leading to the embedded mild steel electrodes were soaked in 3% sodium magnesium chloride solutions, with and without 0.75% lignosulfonate. After 6 weeks, electrochemical measurements showed a 70% reduction in corrosion for the solutions with lignosulfonates. Wiss-Janey concrete test blocks were treated weekly for 1 year with 15% sodium and magnesium chloride solutions, with and without 3.75% lignosulfonate. Chloride penetration data indicated substantially lower chloride levels for blocks treated with salt solutions containing lignosulfonate. This experiment was repeated using small mortar cylinders that were treated with 3% sodium, magnesium, and calcium chloride solutions, with and without 0.75% lignosulfonates. Significant reductions in chloride levels were observed for samples treated with lignosulfonates. The proposed mechanism is the precipitation of lignosulfonates on or with calcium hydroxide to seal the pores in the surface. Depending on conditions, the life span of undamaged reinforced concrete structures could substantially increase if lignosulfonates were added to deicing salts.

This paper appears in Transportation Research Record No. 1268, Highway Maintenance Operations and Research 1990. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01410869

p. 186-192

1990

Transportation Research Record

0309050235

Figures (5) ; References (15) ; Tables (4)

Chlorides; Corrosion; Deicers (Equipment); Inhibitors (Chemistry); Laboratory tests; Lignosulfonate; Performance evaluations

Deicers

Geotechnology; Highways; Materials; Vehicles and Equipment; I35: Miscellaneous Materials

TRIS, TRB

Dec 31 1990 12:00AM

• ASSESSING HIGHWAY FIELD MAINTENANCE OFFICE LOCATIONS BY THE P-MEDIAN MODEL
• COMPARATIVE STUDY OF UNDERCUTTING AND DISBONDMENT CHARACTERISTICS OF CHEMICAL DEICERS
• CRACKING AND SEATING OF CONCRETE PAVEMENT ON I-74
• DEVELOPMENT OF A CORROSION INHIBITOR FOR REINFORCED CONCRETE
• ECONOMIC MODELS FOR SETTING PRIORITIES FOR ROAD MAINTENANCE AND REHABILITATION IN ISRAEL (ABRIDGMENT)
• EFFECTIVENESS OF EPOXY COATINGS IN MINIMIZING CORROSION OF REINFORCING STEEL IN CONCRETE
• EVALUATION OF EXPERIMENTAL COLD-STOCKPILED PATCHING MATERIALS FOR REPAIRS IN COLD AND WET WEATHER
• FACTORS AFFECTING JOINT SYSTEM PERFORMANCE
• FEASIBILITY STUDY OF CHANGES TO THE HIGHWAY MAINTENANCE AND OPERATIONS COST INDEX
• FORECASTING OPTIMUM BRIDGE MANAGEMENT DECISIONS AND FUNDING NEEDS ON THE BASIS OF ECONOMIC ANALYSIS
• INSPECTION OF THE SUBSTRUCTURE OF THE CHESAPEAKE BAY BRIDGE-TUNNEL ABOVE AND BELOW THE WATERLINE
• MAINTENANCE MANAGEMENT ON GRAVEL ROADS (ABRIDGMENT)
• MEDITER, A MODEL FOR ASSESSMENT OF REHABILITATION DELAY COST IN ERASME
• MONITORING STEEL BRIDGES BY ACOUSTIC EMISSION
• OPBRIDGE: AN INTEGRATED BRIDGE BUDGET FORECASTING AND ALLOCATION MODULE AT THE STATE LEVEL
• PERFORMANCE OF DIAMOND GRINDING
• REPETITIVE LOAD TEST ON A COMPOSITE PRECAST-DECKED BRIDGE MODEL
• RESOURCE-CONSTRAINED CAPITAL BUDGETING MODEL FOR BRIDGE MAINTENANCE, REHABILITATION, AND REPLACEMENT
• ROUT AND SEAL CRACKS IN FLEXIBLE PAVEMENT--A COST-EFFECTIVE PREVENTIVE MAINTENANCE PROCEDURE
• SAWING AND SEALING OF JOINTS IN ASPHALTIC CONCRETE OVERLAYS
• SELECTION OF IDEAL MAINTENANCE STRATEGIES IN A NETWORK-LEVEL BRIDGE MANAGEMENT SYSTEM
• STOCHASTIC OPTIMIZATION SUBSYSTEM OF A NETWORK-LEVEL BRIDGE MANAGEMENT SYSTEM
• TIMING FOR BRIDGE REPLACEMENT, REHABILITATION, AND MAINTENANCE
• UNDERWATER INSPECTION OF BRIDGES--OVERVIEW OF A STATEWIDE PROGRAM