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PREFACE: To conserve both resources and energy, and to reduce CO₂, emissions, the Canadian Centre for Mineral and Energy Technology (CANMET) of Natural Resources Canada, Ottawa, has played a significant role in Canada for over 35 years in research on fly ashes, ferrous and nonferrous slags, and silica fumes. In July-August 1983, CANMET, in association with the American Concrete Institute and the U.S. Corps of Engineers, sponsored a five-day international conference at Montebello, Quebec, Canada, on the Use of Fly Ash, Silica Fume, Slag and Other Mineral By-products in Concrete. The conference brought together representatives from industries, universities, and government agencies to present the latest information on these materials and to explore new areas of needed research. The two-volume proceedings of the conference containing 62 papers from 15 countries were published as ACI Special Publication SP-79.