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The Materials Analysis and Research Laboratory has been monitoring the soundness of several sources of fly ash since the early 1980's. The soundness tests were generally conducted in accordance with ASTM Test Method C 311 (the autoclave expansion test utilizing 20% fly ash and 80% portland cement, specimens prepared at normal consistency). To date, several thousand tests have been performed on various samples of fly ash that were submitted to the laboratory. Also, additional studies were conducted to investigate the influence of water content (W/CM ratio) and curing regime on the volume stability of portland cement pastes containing a fly ash that exhibited soundness problems.
Scientist, Iowa State University, Materials Analysis and Research Laboratory, Ames, IA
Stock #: CCA10453J