Predicting Service Life of Chloride-Exposed Steel-Reinforced Concrete.
Predicting Service Life of Chloride-Exposed
Bentz, D. P.
NISTIR 6327; May 1999.
Modelling Service Life and Life-Cycle Cost of
Steel-Reinforced Concrete. Report From the
NIST/ACI/ASTM Workshop Held in Gaithersburg, MD.
Proceedings. Summaries of Invited Presentations.
Summary 2.9. November 9-10, 1998, 15-17 pp, 1999.
Available from: National Technical Information Service
(NTIS), Technology Administration, U.S. Department of
Commerce, Springfield, VA 22161.
1-800-553-6847 or 703-605-6000;
Order number: PB99-144933
reinforced concretes; chlorides; concretes; corrosion;
life (durability); transport processes
A computer-integrated knowledge system (CIKS) provides a
means of combining a wealth of information into a
coherent system useful to both the academic and
commercial communities. For the concrete community, a
subject of vital interest is the service life of
concrete stmctures. For corrosion of reinforcing steel,
the diffusion rate at which chloride can reach the steel
is one of the controlling factors in determining how
long a structure will last. A prototype CIKS for use in
predicting the service life of steel-reinforced concrete
exposed to chloride ions has been developed. Starting
from the mixture proportioning process, the system
proceeds to predict chloride ion diffisivity
coefficients and finally to predict the ingress profiles
and the time-to-initiation of corrosion for a reinforced
concrete exposed in a specific environment. The CIKS
integrates into a single coherent system a number of
computer models -- some previously developed, some new.