- Author
-
Clifton, J. R.
|
Bentz, D. P.
|
Ponnersheim, J. M.
- Title
- Sulfate Diffusion in Concrete.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
Bucknell Univ., Lewisburg, PA
- Report
-
NISTIR 5361,
February 1994,
23 p.
- Distribution
- 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
- Keywords
-
concretes
|
diffusion coefficient durability
|
radioactive waste
|
service life
|
service life prediction
|
sulfate attack
- Abstract
- The sulfate diffusion coefficient is a variable in theoretical models used for predicting the service life of concrete. Analysis of sulfate models predicts that if the process is either diffusion or reaction controlled, a 10-fold increase in the diffusion coefficient results in a 10-fold increase in the predicted service life. Therefore, reliable estimates of sulfate diffusion coefficients are needed to make reasonable service life predictions. Methods for determining the sulfate diffusion coefficient of sulfates in cement-based materials are explored in this paper, including experimental methods and mathematical modeling. Also, an approach for estimating the diffusion coefficient of sulfate ions is presented, which is based on comparing sulfate diffusion coefficients with chloride diffusion coefficients.