New innovative technologies which will be investigated in DURECOBEL project for the development of building elements. These technologies are:

  1. Compaction moulding. According to this technology, suitably prepared mixtures of quarry dust, recycled aggregates (from construction and demolition wastes) and cementitious binders, are homogenized, mixed and sprayed with water. The resulting semi-dry mixture is compressed to form specimens. These specimens are cured in a climatic chamber for 28 days to reach their final mechanical strength. 
  2. Free flow casting.  Appropriate blends of quarry dust, recycled aggregates, cementitious binders and admixtures are homogenized and mixed in a laboratory mortar mixer.  By adding chemical additives and appropriate quantities of water the resulting mixture gain fluidity so it can casted easily into moulds to form building elements of simple geometry such as a decorative building brick or an artificial stone.
  3. Extrusion. Fine aggregates (e.g. quarry dust), cementitious binders, cellulose and other chemical additives are mixed with proper amounts of water until reaching the required plasticity for extrusion. The resulting mixtures are extruded to form self-supported specimens with simple or complex cross-section (e.g. hollow bricks) 
  4. Geopolymerization. Mixtures of fine aggregates from construction and demolition wastes are mixed with standard alkaline solutions, casted in special moulds and then heated to low temperatures (60-90o C) for a short time. The so formed specimens are left to mature in ambient conditions until reaching their final mechanical properties.