文档介绍：FIELD EVALUATION OF CORROSION IN REINFORCED
CONCRETE STRUCTURES IN MARINE ENVIRONMENT
Mereoni M. B. Bola
Craig M. Newtson
Prepared in cooperation with the State of Hawaii Department of Transportation,
Highways Division and . Department of Transportation, Federal Highway
Administration
UNIVERSITY OF HAWAII
COLLEGE OF ENGINEERING
DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Research Report UHM/CE/00-01
June 2000
ABSTRACT
Eight sites were selected for field evaluation in coperation with the Harbors
Division of the Hawaii Department of Transportation. Seven of the sites used a calcium
nitrite based admixture as a corrosion inhibitor. The eighth site used epoxy coated
reinforcing steel bat corrosion. Each site was tested for permeability, chloride ion
concentration, half-cell potential, polarization resistance, resistivity, and pH. Corrosion
activity identified by the half-cell potential measurements, polarization resistance
measurements, and visual inspection of bars taken from cores indicated that high dosages
of calcium nitrite ( to gal/yd3) provided the steel with significantly greater
3
protection than lower dosages ( gaVyd ). Visual inspection of epoxy coated bars taken
from cores also demonstrated that the epoxy coating effectively protected the steel.
Resistivity measurements often contradicted the results from the half-cell potential and
polarization resistance tests. However, visual inspections supported the half-cell and
polarization resistance tests, indicating that the resistivity measurements were erroneous.
TABLE OF CONTENTS
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Abstract ............................................................................................. 11
List of Tables .......................................................................................v
List of Figures ...................................................................................vi...
Chapter 1: Introduction ....