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| Research Roundup: Aerosols 2 (AIHce EXP 2022 OnDemand) | |
| Course Description: Recorded at AIHce EXP 2022 Presentations Respirable Dust Generated from Cutting Concrete in Laboratory Full-Scale Cutting Tests with Conical Picks at Different Stages of Wear Respirable dusts (particles small enough to penetrate into human lungs), pose serious long-term health issues to workers using mechanized mining and tunneling machines for hard rock excavation. The purpose of this preliminary study is to characterize and compare the respirable concrete dust particles generated at the pick tip during excavation for different stages of conical pick life. Characteristics of dust particles (e.g., concentration, size distribution, shape) will provide a basis for changing out picks to mitigate dust generation at the source or increase dust controls to limit exposures. This research provides the findings of these specific dust characteristics generated from full scale laboratory cutting tests with a linear cutting machine. A concrete block was used in the experiments with conical picks at new, moderately worn, and fully worn levels of wear. Results strongly suggest an increase in dust levels with wearing of picks, a shift in larger particle sizes with wearing of picks, and some statistically significant differences in particle shapes when cutting with different pick wears. Influence of Face Shields on Exposures to Respirable Aerosol Three face shield designs were tested on a breathing mannequin in a low speed wind tunnel to determine their efficiency at reducing particle exposures for the wearer. While each face shield was shown to reduce the concentration of respirable aerosol in the breathing zone, efficiency varied by particle size and face shield design. Presentation Date: 05/23/2022 Presenters: Amanda Kramer, MS, CIH Syd Slouka Darrah Sleeth, PhD, MPH, CIH Session recordings are available for 90 days from purchase. Stock #: AOD22_B2 ISBN #: Author/Editor: Member $25/Non-Member $35/Student $25 Your Price: $35.00
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