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Title: Stability of calcium chloroaluminate and calcium sulfoaluminate phases in hydraulic-cement mixtures
Authors: United States. Department of Energy.
Sandia National Laboratories
Poole, Toy S.
Keywords: Calcium chloroaluminate
Calcium sulfoaluminate
Chemical stability
Friedel's salt
Concrete expansion
Concrete contraction
Cement additives
Radioactive waste disposal
Waste Isolation Pilot Plant
New Mexico
Publisher: Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-93-2.
Description: Miscellaneous Paper
Abstract: For many reasons and many years, candidate cement-based materials for closure of the Waste Isolation Pilot Plant (WIPP) have been proportioned with components to make them both salt-saturated and expansive. The chloride and sulfate phases that form when these materials hydrate have the potential to be chemically unstable if chemical conditions shift. Interconversions between these phases were considered a potential threat to grout or concrete stability and were the focus of extensive research during the 1980's. A review of published research from other sources and of both published and unpublished research from the WES revealed that these phase transformations do occur in conditions similar to those of the WIPP repository, but that these changes pose little threat to the integrity of cement-based plugging and sealing materials.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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