The valorisation of waste or of industrial subpro ducts is an acute necessity or imposed firstly by reasons regarding the environment protection. The concrete is a very suitable material for the valorisation of this kind of materials.

The utilisation in cement and concrete of materials like granulated blast furnace slag or thermal station fly ash is proved scientifically and is in common use in many countries.

The possibility to use concrete from demolitions as aggregate or of glass waste as substitute of the fine aggregate in concrete or even of cement was related in the last decades.

The present paper brings information regarding some main characteristics of fresh and hardened concrete, containing aggregates partially substituted with crushed glass or recycled concrete.

The crushed glass was sorted in the fractions of 2-3 mm, 0.63-2 mm and 0.09-0.63 mm and used as substitute (40-60%) of the fine aggregate (sand). A very fine glass powder (< 0.09 mm) was used as substitute (10-30%) of the cement.

An old concrete was crushed and considered instead of the 3-16 mm fraction of the traditional aggregate.