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1. (WO1991006513) PROCESS FOR PRODUCING AN ACTIVE FINE AGGREGATE FOR THE PREPARATION OF CONCRETE
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Claims:

1. A process for producing an active fine aggregate for the preparation of concrete, c h a r -a c t e r i z e d in that a raw material mixture is made containing substantially dry inactive and/or weakly active components selected from a group consisting of e.g. limestone, quartz, lump slag, granulated and pelletized blast-furnace slag; and silica or another substance containing an abundance of fine amorphous silicon oxide; and that this substantially dry raw material mixture is ground in a mill or the like, as a result of which joint grinding the silica or the other substance containing an abundance of fine amorphous silicon oxide activates the surfaces of the inactive and/or weakly active components to react easily with the calcium hydroxide.
2. A process according to claim 1, c h a r a c t e r i z e d in that the share of silica or another substance containing an abundance of fine silicon oxide is 50 % by weight at the most, preferably less than 10 % by weight.
3. A process according to claim 1 or 2,
c h a r a c t e r i z e d in that the composition of the fine aggregate is as follows:
- 10 % by weight of silica at the most;
15 % by weight of inactive components, as limestone, at the most;
- 5 % by weight of a grinding additive, as lignosulphonate, at the most; and
- the rest inactive components, as lump slag.