proCLIR
UltraLit®
Certified Aggregate for Concrete
- Gravel substitute for concrete production (up to 45 %)
- Certified according to EU 305/2011 and DIN EN 12620.
- Utilisation of up to 95 % of the sintered ash
- No need for carbonatisation → no expensive storage
Gravel is increasingly perceived as a limited raw material. With UltraLit® you offer the construction industry a high-quality alternative at a favourable price.
What Are the Possible Applications of UltraLit®?
According to German legislation, up to 45% of the aggregate in concrete may be replaced by recycled materials. UltraLit® was developed for precisely this purpose. The gravel substitute obtained from bottom ash demonstrably fulfils the strict requirements of EU 305/2011 and DIN EN 12620 and is also certified accordingly. This makes UltraLit® a cost-effective alternative of the highest quality for the production of in-situ concrete and precast concrete elements.
Left: Rectangular blocks with 17 % UltraLit®.
What Advantages Does UltraLit® Offer?
UltraLit® creates a fully-fledged raw material from waste incineration, which can be used for the production of new building materials. Up to now, conventional processes have only been used to obtain substitute building materials from waste incineration ash. These are usually used as a sediment layer in construction projects. However, this is a more useful alternative to simple landfilling. In addition, previous methods usually required lengthy carbonation of the ash in storage facilities. This was space-intensive and therefore costly. With the IRRT process, this form of carbonation is no longer necessary.
Right: UltraLit® aggregate.
What Is UltraLit® Made of?
During the thermal treatment of waste, temperatures are so high that some of the ash melts and becomes doughy. As it cools, this previously doughy ash fossilises or "sinterises". In this solid state, the mass is referred to as "slag". More than half of the IBA produced usually consists of this slag. The IRRT process allows you to process up to 95% of this material as aggregate into building material. Thanks to this exceptionally high rate, the remaining bottom ash is reduced by around 51% on average.
Left: Grate ash with sintered slag.
How Is the High Quality of UltraLit® Achieved?
The high quality of UltraLit® is achieved through specially developed processes. The material is dynamically carbonatised (DyCAR) by using CO2 and subjecting it to high-frequency digestion (RoTAC). This dissolves unstable conglomerates. Isolated, solid components remain. An additional ultrasonic treatment (ReUST) removes the last adhering particles. The result is a finely broken down aggregate with excellent physical properties.
