EFFECTS OF CARBONATION ON THE LONG-TERM LEACHING PERFORMANCE OF CEMENTITIOUS WASTEFORMS

N. Gutierrez1, M.D.S. Bin-Shafique1, J. Walton1, A. Tarquin1, R. Smith2, P. Sheeley1, M. Rodriguez1, and R. Andrade1, 1University of Texas at El Paso, Department of Civil Engineering, El Paso, TX, and 2Idaho National Engineering Laboratory, Idaho Falls, ID

ABSTRACT Cement-based wasteforms are among the most commonly used waste disposal and site remediation options. However, concrete knowledge of the processes controlling long-term performance of the wasteforms is lacking. This research evaluates the effect of carbonation on cementitious wasteforms. Wasteforms were reacted with carbon dioxide for a prolonged period and then subjected to leaching tests. Ions tested were nitrate, strontium, cadmium, cobalt, calcium, and lead. Results indicate that carbonation causes both physical and chemical changes to the concrete. The leaching rate was higher in the carbonated wasteforms for all the ions except strontium. Thus, effects of carbonation can vary depending on the chemical species and other physical and chemical effects.

KEYWORDS: cementitious wasteforms, carbonation

This paper is from the Proceedings of the HSRC/WERC Joint Conference on the Environment, May 1996, published in hard copy and on the Web by the Great Plains/Rocky Mountain Hazardous Substance Research Center.

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