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Mineralisation with sulfate and fluoride
Portland cement usually contains a few wt% minor elements,
due to impurities in the raw materials. The minor elements have
different effects on the clinker composition:
- New minor phases can be formed.
- Fluxes and can affect the properties of the oxide melt and
thereby improve the alite formation and change the phase composition
of the clinker.
- The minor elements can enter the main clinker phases as substitutions.
- Increased substitutions can cause stabilisation of high temperature
polymorphs of the main clinker phases.
All these effects can affect the hydraulic activity of the
clinker, both positively and negatively. In some Plants minor
elements are added as mineralisers to utilise their positive effects,
e.g. we have studied the effects of SO42-
and F- mineralisation in production clinkers:
- “A Comparative Study of Ordinary and Mineralised Portland
Cement Clinker From Two Different Production Units. Part I: Composition
and Hydraulic Activity of the Clinkers.” A. Emanuelson, S.
Hansen and E. Viggh (manuscript)
- “A Comparative Study of Ordinary and Mineralised Portland
Cement Clinker From Two Different Production Units. Part II: Characteristics
of the Calcium Silicates.” A. Emanuelson, S. Hansen and A.
R. Landa-Cánovas (manuscript
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