The Recbuild process allows to transform mixtures of wastes in lightweight granulates with excellent physical, mechanical and chemical properties.
The necessary components for the process are:
- coal combustion ashes;
- steel making dust;
- expanding additive already patented.
Through a baking process at high temperature in a rotating oven it's possible to obtain grains with the following characteristics:
| Properties | Aggregate 1 | Aggregate 2 | Reference norm | | Grain size | 0,5-4mm | 4-12mm | UNI 7549/3 | | Apparent particle density | 693kg/m3 | 956kg/m3 | UNI 7549/5 | | Real density of the grains | 1625kg/m3 | 1126kg/m3 | UNI 7549/4 | | Water absorption after 24 hour | 3,74% | 4,83% | UNI 7549/6 | | Compressive (crushing) resistance | 24,3MPa | 8,44MPa | UNI 7549/7 | | Steam stability | > 99,9% | > 99,9% | UNI 7549/11 | | Freezing/thawing resistance | > 99,9% | > 99,9% | UNI 7549/10 | | Leaching tests with CO2 and acetic acid | Inferior to the limits of table A | Inferior to the limits of table A | Dpr 915/82 |
These characteristics make the obtained lightweight aggregate surely superior to the traditional expanded clay actually on the market.
Till now this process has been developed only at lab level using a electric rotative oven but in future it will be possible to produce consistent lots of these aggregates using a plant similar to the one used for the experimentation of the LAW process.
|
|
