Characterization of Particle Size Distributions of Powdery Building Material Aerosol Generated by Fluidization and Gravitation

Abstract

This study aims to identify particle size distributions (PSD) of aerosol of powdery building materials commonly used in construction work (cement, chalk, clay, wood sawdust, wood grinding dust, gypsum, hydrated lime, masonry grout, quartz sand, sand and structural lime) by two aerosolization methods: fluidization and gravitation. Fluidization and gravitation methods represent industrial activities such as pneumotransportation and unloading. Both particle resuspension mechanisms have been modelled in laboratory conditions.
The particle size distributions of resuspended particulate matter from powdery building materials were rather similar identified by both fluidization and gravitation methods, with an exception of wood sawdust and sand. The PM₁₀ fraction ranged between 30% and 87%, PM_2.5 from 7% to 28% and PM_1.0 from 3% to 7% of the total mass of particulate matter. The highest PM₁₀/PM_total ratio was calculated for masonry grout - 0.87, and the lowest ratio for quartz sand - 0.30. The highest ratio of PM_2.5/PM_total was calculated for sand - 0.23, the lowest for quartz sand - 0.07. Substantial quantities of PM_2.5 were found to be emitted implying a potential threat to human health.

DOI: http://dx.doi.org/10.5755/j01.erem.61.3.1519