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A platform for research: civil engineering, architecture and urbanism
Slag-containing cements with bimodal particle size distribution
The purpose of thes studies was to indicate a way of significantly increasing the initial strength of slag-containing cements, with at the same time constant or only slightly altered late strength and unchanged workability properties. In summary, it can be stated that this purpose has been achieved. The solution consists in the separate grinding of the main cement components, in the use of minimal proportion of ultrafine slag as a very reactive component, in the use of coarse ground slag as a coarser correcting consitutent, and in the optimal matching of the particle size distributions of the slag and clinker fractions. This matching ensures that the workability properties of the cement are not impaired. Clinker could be specified at a lower fineness than is generally usual at present. Clinker-rich Portland slag cements also respond very favourably to an optimisation of the slag fraction. In the economic assessment of the optimisation achieved, the increased costs for the production of the ultrafine slag and the blending process must be set against the grinding energy saved with the cvlinker, a possibly reduced clinker content in the cement and the increased strength attained and the associated increase in added value. The descriptiopn of the particle size distributions in the RRSB diagramm should, in contraryy to DIN 66145, be in terms of a weighted linear regression. In conclusion, it should be pointet out that a detailed description of the studies presented appeared as volume no. 10 of the ''Schriftenreihe der FEhS''.
Slag-containing cements with bimodal particle size distribution
The purpose of thes studies was to indicate a way of significantly increasing the initial strength of slag-containing cements, with at the same time constant or only slightly altered late strength and unchanged workability properties. In summary, it can be stated that this purpose has been achieved. The solution consists in the separate grinding of the main cement components, in the use of minimal proportion of ultrafine slag as a very reactive component, in the use of coarse ground slag as a coarser correcting consitutent, and in the optimal matching of the particle size distributions of the slag and clinker fractions. This matching ensures that the workability properties of the cement are not impaired. Clinker could be specified at a lower fineness than is generally usual at present. Clinker-rich Portland slag cements also respond very favourably to an optimisation of the slag fraction. In the economic assessment of the optimisation achieved, the increased costs for the production of the ultrafine slag and the blending process must be set against the grinding energy saved with the cvlinker, a possibly reduced clinker content in the cement and the increased strength attained and the associated increase in added value. The descriptiopn of the particle size distributions in the RRSB diagramm should, in contraryy to DIN 66145, be in terms of a weighted linear regression. In conclusion, it should be pointet out that a detailed description of the studies presented appeared as volume no. 10 of the ''Schriftenreihe der FEhS''.
Slag-containing cements with bimodal particle size distribution
Schlackenhaltiger Zement mit bimodaler Korngrößenverteilung
Ehrenberg, A. (author) / Lang, E. (author) / Geiseler, J. (author)
2002
8 Seiten, 14 Bilder, 1 Quelle
Conference paper
English
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