Concrete, esp. for civil engineering - which includes two artificial Portland cements of different colours and possibly pigments, so concrete has decorative colour

摘要

Concrete contains a hydraulic binder, sand, and an aggregate. The binder and/or the sand contain or comprise two fractions with different colours, whereas the granulate contains at least 75% of semi-crushed gravel and small rounded stones without facettes. The two binder fractions of different colours consist of two artificial portland cements. The concrete pref. has a ratio of binder wt./sand wt. which is constant and 0.42/1 to 0.5/1. The concrete pref. also contains a pigment, esp. (wt.%) 0.2-3.5% of ultramarine blue or brown iron oxide. The water/cement ratio is pref. ca. 1/2.