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Modelling Service Life and Life-Cycle Cost of Steel-Reinforced Concrete. Report From the NIST/ACI/ASTM Workshop Held in Gaithersburg, MD on November 9-10, 1998.


pdf icon Modelling Service Life and Life-Cycle Cost of Steel-Reinforced Concrete. Report From the NIST/ACI/ASTM Workshop Held in Gaithersburg, MD on November 9-10, 1998. (2605 K)
Frohnsdorff, G. J. C.

NISTIR 6327; 55 p. 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. November 9-10, 1998, 55 pp, 1999.

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB99-144933

Keywords:

reinforced concretes; chlorides; concretes; corrosion; life (durability); transport processes

Abstract:

**EACH PAPER IS TREATED LIKE A SEPARATE DOCUMENT AND MAY BE VIEWED AND/OR DOWNLOADED THAT WAY** The NIST/ACI/ASTM workshop on "Modelling Service Life and Life-Cycle Cost of Steel-Reinforced Concrete" was focused on possibilities for developing and standardizing such models, specifically for chloride-exposed concrete. The report includes summaries of nine presentations by model developers and reports from working groups that addressed i) chloride transport mechanisms and test methods, ii) chloride thresholds for corrosion initiation, iii) corrosion rate and time to rehabilitate or replace, and iv) life-cycle cost and service life prediction models. Several models for chloride transport to the steel were well advanced, but modelling of chloride thresholds and corrosion rates poses difficulties that still need to be overcome. Economic models for life-cycle costing are in place and ready to use with service life models as they are developed. It was agreed that standard models for service life prediction and life-cycle costing are necessary. It was recommended that a simple, but useful model could and should be developed and standardized in the short term, with a more scientifically sound model being a longer term objective. The model development would need to be supported by development of some new standard test methods and databases containing appropriate and reliable data. Standardization of the models would be expected to be carried out in ACI committees and standardization of test methods in ASTM. NIST's Partnership for High-Performance Concrete Technology would contribute to the development of models, test methods, and data.

Selected Papers

Tribute to James R. Clifton (1933-1999).
Frohnsdorff, G. J. C. Introduction.
Frohnsdorff, G. J. C. RILEM Technical Committee TMC, Testing and Modelling Chloride Penetration in Concrete.
Castellote, M. Model for a Quantitative Corrosion Damage Function for a Reinforced Concrete Marine Substructure.
Sagues, A. Present Limitations in Scientifically-Based Prediction Models for Chloride Ingress Into Submerged Concrete.
Nilsson, L. O. Chloride Exposed RC-Structures: Chloride Ingress and Lifetime Prediction by the Hetek Model.
Poulsen, E. Modelling Chloride Ingress by the Combined Processes of Diffusion and Convection.
Thomas, M.; Bentz, E. Modeling Ion Transport in Cement-Based Materials.
Marchand, J.; Samson, E.; Maltais, Y. Duramodel for the Design of Cost-Effective Concrete Structures.
Tourney, P. Creating a Standard Corrosion Service Life Prediction Method.
Miltenberger, M. A. Predicting Service Life of Chloride-Exposed Steel-Reinforced Concrete.
Bentz, D. P. Using Concrete Service Life Prediction Models to Estimate the Life-Cycle Costs of Concrete Structures.
Ehlen, M. A. Working Group Reports 1-8. Final Discussion and Recommendations.
National Institute of Standards and Technology; American Concrete Institute; American Society for Testing and Materials