Estimation of the cementitious propertie

This study is a first step in investigating the possibility to create low cost alternative binders by reusing industrial by-products as supplementary cementitious materials. The created binders are dedicated to applications requiring low mechanical strength like waste stabilisation/solidification or mine backfill. A total of 8 by-products are tested: 6 for their pozzolanic properties (waste glass, 2 kinds of wood ashes, deinked sludge ash, copper slag, and CAISiFrit®) and 2 as hydration activators (cement kiln dust and fluegasym). The results obtained show that the tested pozzolanic by-products participate to the strength development. These by-products are sufficiently reactive to substitute between 20 and 50% of Portland cement. Fluegassylum can be used as a calcium source but has to be mixed with Portland cement because of its residual acidity. Finally, cement kiln dust promotes the mechanical strength development even at low amounts (5%). It is estimated that binder supply costs could be reduced by up to 37.5% with interesting environmental benefits including a reduction of greenhouse gas emission.