title: Influence of compressive strength and applied force in concrete on particles exposure concentrations during cutting processes.
abstract: The objective of this research was to identify the influence of applied force (AF) and the compressive strength (CS) of concrete on particle exposure concentrations during concrete cutting processes. Five cutting conditions were selected with AF varied between 9.8 and 49 N and CS varied between 2500 and 6000 psi. For each selected cutting condition, the measured total dust concentrations (C(tot)) were used to further determine the corresponding three health-related exposure concentrations of the inhalable (C(inh)), thoracic (C(thor)), and respirable fraction (C(res)). Results show that particle size distribution was consistently in a bimodal form under all selected cutting conditions. An increase in CS resulted in an increase in coarse particle generations leading to an increase in the four measured particle exposure levels. An increase in AF resulted in an increase in exposure concentrations with a higher fraction of fine particles (i.e., C(tho) and C(res)) However, for particle exposure concentrations with a higher fraction of coarse particles (i.e., C(tot) and C(inh)), an increase in AF resulted in an initial increase, followed by a decrease in concentration. Finally, the above inferences were further confirmed through the use of fixed-effect models to determine the influence of both CS and AF on the four exposure concentrations. These results provide a reference for industries to initiate appropriate control strategies to reduce the exposure levels encountered by workers.
authors.affiliation: Department of Environmental and Occupational Health, Medical College, National Cheng Kung University, 138, Sheng-Li Road, Tainan 70428, Taiwan.
authors.forename: Jhy-Charm
authors.initials: JC
authors.lastname: Soo
authors.forename: Perng-Jy
authors.initials: PJ
authors.lastname: Tsai
authors.forename: Ching-Hwa
authors.initials: CH
authors.lastname: Chen
authors.forename: Mei-Ru
authors.initials: MR
authors.lastname: Chen
authors.forename: Hsin-I
authors.initials: HI
authors.lastname: Hsu
authors.forename: Trong-Neng
authors.initials: TN
authors.lastname: Wu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D019245:Compressive Strength; D003252:Construction Materials / Q000032:analysis*; D006801:Humans; D019570:Inhalation Exposure / Q000032:analysis* / Q000706:statistics & numerical data; D008420:Manufactured Materials; D008422:Materials Testing; D016273:Occupational Exposure / Q000032:analysis / Q000706:statistics & numerical data; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter