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US 12,630,475 B2Granted
Method of providing a reactive cement constituent or concrete additive
AssigneeRheinisch-Westfälische Technische Hochschule (RWTH) Aachen
InventorsLars Weitkämper, Martin Rausch, Dirk Gossmann, Anya Vollpracht, Hermann Wotruba, Andreas Jungmann
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Abstract
A method of providing a reactive cement constituent or concrete additive includes at least the following steps: a) reworking a carbon-containing heap comprising at least coal and clay-bearing rock; b) extracting at least calcined rock; c) producing fine-grain calcined rock; and d) providing fine-grain calcined rock for use as cement constituent or concrete additive.
Claims10
A method of providing a reactive cement constituent or concrete additive, comprising:
- a) identifying a heap starting material from a heap being an accumulation of tailings of extracted material from a coal mine comprising at least coal and clay-bearing rock, wherein the heap starting material comprises at least calcined rock including autogenously calcined clay formed through burnout of the coal;
- b) selectively reworking the heap starting material and extracting the at least calcined rock from the heap starting material;
- c) producing fine-grain calcined rock from the at least calcined rock;
- and
- d) providing the fine-grain calcined rock, the fine-grained calcined rock being suitable for use as cement constituent or concrete additive.
2 more elements
Dependencies are inferred from the claim text.