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Koch, A.* ; Friederici, L.* ; Fiala, P.* ; Springer, A.* ; Di Bucchianico, S. ; Stintz, M.* ; Frank, M.* ; Rüger, C.P.* ; Streibel, T. ; Zimmermann, R.

Impact of thermal stress on abrasive dust from a carbon fiber-reinforced concrete composite.

Fibers 10:39 (2022)

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	Open Access Gold

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Recently, a novel corrosion-resistant construction material, Carbon Concrete Composite (C3 ), consisting of coated carbon fibers embedded in a concrete matrix, was introduced. However, thermal exposure during domestic fires may impact the release of organic pollutants and fibers during abrasive processing and/or demolition. Consequently, the objective of this study was to explore the emission characteristics of toxic compounds and harmful fibers during the dry-cutting after exposure to 25–600◦C (3 h, air). These parameters mimic the abrasive machining and dismantling after a domestic fire event. Mass spectrometry and chromatography served as analytical methodologies, and no organic pollutants for exposure temperatures ≥ 400◦C were found. In contrast, significant amounts of pyrolysis products from the organic fiber coating were released at lower temperatures. Studying the morphology of the released fibers by electron microscopy revealed a decrease in fiber diameter for temperatures exceeding 450◦C. At ≥550◦C, harmful fibers, according to the World Health Organization (WHO) definition, occurred (28–41 × 104 WHO fibers/m3 at 550–600◦C). This leads to the conclusion that there is a demand for restraining and protection measures, such as the use of wet cutting processes, suction devices, particle filtering masks and protective clothing, to handle thermally stressed C3 .

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