Abstract
A Type I Portland cement has been produced using anorthite from copper-nickel tailings and raw taconite tailings. The cement exhibited better strength properties than ordinary Type I Portland cement and gave a stronger concrete when tested under identical curing conditions. Factors leading to the attainment of these higher strength values are identified and their effects on the ultimate mechanical properties of cement are discussed. It is also anticipated that the compositional variety of tailings may also have other beneficial effects on long-term cement behavior such as resistance to sulfate attack.
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