Aggregate for concrete and concrete composition containing same

US4134774A · kind A · utility

Assignee

• STEAG GmbH · DE

Inventors

• Dieter H. W. Heese · Bochum, DE
• Gerhard Hausberg
• Hans Lehmann
• Hans-Joachim Schmidt · Ingolstadt, DE
• Klaus Goldschmidt · Essen, DE
• Kyaw Than · Essen, DE

Key dates

• Filing date: Mar 3, 1977
• Grant date: Jan 16, 1979
• Expiry date: Mar 3, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/91
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Concrete, especially for producing concrete blocks of high compressive strength, is formed from a hydraulic binder and an improved aggregate which consists of 0.1:1 to 1:0.1 parts of a sludge to comminuted slag. The sludge is a calcium-containing product of the scrubbing of the flue gases of a fossil-fuel boiler, preferably of a power plant, while the slag can be melting-chamber slag or ash obtained from the furnace. The composition may also contain sand or gravel. It is combined with water, to be cast into cement blocks of high compressive strength. Low proportions of the hydraulic binder are required with the improved aggregate.