文档介绍：Modeling the Time to Corrosion Initiation
for Concretes with Mineral Admixtures and/or Corrosion Inhibitors
in Chloride-Laden Environments
Jerzy Ô emajtis
Dissertation submitted to the Faculty of the
Virginia Polytechnic Institute and State University
in partial fulfillment of the requirements for the degree of
Doctor of Philosophy
in
Civil Engineering
Richard E. Weyers, Chair
Thomas E. Cousins
John G. Dillard
Richard D. Walker
James P. Wightman
January 19, 1998
Blacksburg, Virginia
Keywords: concrete, corrosion, permeability, reinforcing steel
Copyright Jerzy Ô emajtis
Modeling the Time to Corrosion Initiation
for Concretes with Mineral Admixtures and/or Corrosion Inhibitors
in Chloride-Laden Environments
Jerzy Ô emajtis
(ABSTRACT)
The application of a mineral admixture, or a corrosion inhibitor, or bination of
both are methods used for the corrosion protection for reinforced concrete bridges.
The results of a study on evaluation of corrosion inhibitors from three different
manufacturers and of concretes with fly ash, slag cement, and silica fume and a
concrete with silica fume and a corrosion inhibitor are presented. The specimens were
built to simulate four exposure conditions typical for concrete bridges located in the
coastal region or inland where deicing salts are used. The exposure conditions were
horizontal, vertical, tidal, and immersed zones. The specimens were kept inside the
laboratory and were exposed to weekly ponding cycles of 6% (w/w) sodium chloride
solution. In addition, cover depth measurements from 21 bridge decks and chloride
data from 3 bridge decks were used, together with laboratory data, in modeling the
service lives of the investigated corrosion protection methods.
The methods used to assess the condition of the specimens included chloride
concentration measurements, corrosion potentials, and corrosion rates (3LP).
Additionally, visual observations were performed for identifica