A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Fluxes and mineralizers: fluoro-sulfate cements
This chapter describes a revision of the effects produced by the fluxing-mineralizer pair CaF2 and CaSO4 on compositions placed in the system CaO-SiO2-Al2O3-Fe2O3 in CaO-rich zones. The separate and joint effect of CaF2 and CaSO4 on each of the binary and ternary subsystems at different temperatures is analyzed, giving account of the changes produced in the relation of phases in thermodynamic equilibrium, at the invariant points, etc.. Also, the diverse industrial experiences using mineralized cements fabrication with CaF2 and CaSO4 are shown. So, the addition of this mineralizer pair to portland cement raw mixes produces a modification in their technological characteristics because of the increase in their reactivity and the enhancement of burnability. Raw mixes with high MS values and LSF values close to 1 may be clinkered at temperatures between 1350 deg C and 1400 deg C and within technologically suitable time periods. Thus, the clinkering energy cost is considerably decreased when the mineralizer pair substitutes ferrites and aluminates. The obtained clinker is rich in silicates, it contains low proportions of aluminates (< 5 % by weight) and fluorellesteadite (a compound with apatite structure, very stable in aqueous media and basic pH). The physical and mechanical characteristics of the cement obtained with that clinker are similar to those of an OPC, being its excellent durability against chemically aggressive agents like sulfated waters or sea water.
Fluxes and mineralizers: fluoro-sulfate cements
This chapter describes a revision of the effects produced by the fluxing-mineralizer pair CaF2 and CaSO4 on compositions placed in the system CaO-SiO2-Al2O3-Fe2O3 in CaO-rich zones. The separate and joint effect of CaF2 and CaSO4 on each of the binary and ternary subsystems at different temperatures is analyzed, giving account of the changes produced in the relation of phases in thermodynamic equilibrium, at the invariant points, etc.. Also, the diverse industrial experiences using mineralized cements fabrication with CaF2 and CaSO4 are shown. So, the addition of this mineralizer pair to portland cement raw mixes produces a modification in their technological characteristics because of the increase in their reactivity and the enhancement of burnability. Raw mixes with high MS values and LSF values close to 1 may be clinkered at temperatures between 1350 deg C and 1400 deg C and within technologically suitable time periods. Thus, the clinkering energy cost is considerably decreased when the mineralizer pair substitutes ferrites and aluminates. The obtained clinker is rich in silicates, it contains low proportions of aluminates (< 5 % by weight) and fluorellesteadite (a compound with apatite structure, very stable in aqueous media and basic pH). The physical and mechanical characteristics of the cement obtained with that clinker are similar to those of an OPC, being its excellent durability against chemically aggressive agents like sulfated waters or sea water.
Fluxes and mineralizers: fluoro-sulfate cements
Blanco-Varela, M.T. (author) / Palomo, A. (author) / Puertas, F. (author) / Vazquez, T. (author)
1998
74 Seiten, 31 Bilder, 12 Tabellen, 152 Quellen
Article/Chapter (Book)
English
Fluxes and Mineralizers in the Clinkering Process
| British Library Conference Proceedings | 1994
Burnability Studies with Mineralizers/Fluxes in Clinker Manufacture
| British Library Conference Proceedings | 1994
COMPOSITE MINERALIZERS/FLUXES FOR THE PRODUCTION OF ALITE/CALCIUM SULFOALUMINATE CLINKERS
| European Patent Office | 2024