The use of alternative fuels waste derived, as partial substitutes of the traditional fuels, represents a valuable practice in the cement industry. Co-incineration of waste in the clinker kilns has environmental and economic benefits related to preserving the fossil fuels reserves and recovery of certain types of waste that otherwise would have been dumped.

Substitution of the traditional fuels with some proportion of alternative fuels has an impact on the thermal process in the kiln system, with possible consequences on compositional and structural characteristics of the clinker and also on the cement reactivity and its binding properties.

There is only little information available on the impact of alternative fuels use on the compositional characteristics of clinker and even fewer data on the quality of cements prepared from such clinkers.

The present paper brings some data on these topics as a result of the research activities developed in SIMONa department – POLITEHNICA University of Bucharest.

Clinkers burnt in two plants using different proportion of alternative fuels, were characterized from the point of view of their composition and structure. From these clinkers, cements were prepared and their main properties were investigated.