An additive for concrete, in particular for concrete blocks high compressive strength

摘要

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.