Innovative sensor system

Innovative sensor system

Traditionally, quality control is mostly performed by laboratory analysis following incidental sampling by virtue of the fact that primary resources used as input materials are fairly consistent in quality (e.g. cement-making) or that the low-grade applications are significantly tolerant to variations in material specifications (e.g. road construction). By contrast, high-grade applications such as cement and mortar production are more demanding on constant quality of input materials. Inherently, recycled products show greater variations in quality compared to natural resources such as aggregate and limestone, which necessitates online and continuous quality control. Moreover, the possibility of implementing online control strategies allows the documentation and certification of various material streams resulting from demolition, which in turn is of prime importance for deciding which subsequent processes are needed to get optimal ecological benefits and economic value from the waste material stream.

Within the frame of this C2CA project, an innovative sensor system based on Laser-Induced Breakdown Spectroscopy (LIBS) has been developed for both documentation of properties of high throughput secondary materials (e.g. classification of waste components, determination of material composition) and online quality control (e.g. tuning of processing parameters based on sensor data) in the complete recycling chain from demolition to mortar production. Combining online LIBS sensor system with innovative processing technologies such as Advanced Dry Recovery (ADR) and autogenous milling, the C2CA recycling proves to be a dynamic upcycling approach adaptive to varying input materials that can still produce homogenous outputs with constant quality.

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