[Emission of nanometer size particles during selected processes with construction materials using]

Area of Science:

• Environmental Science
• Occupational Health
• Nanotechnology

Background:

• Construction materials incorporating nanostructures can release nanoparticles and ultrafine particles.
• Assessing occupational exposure to these particles is crucial for worker safety.

Purpose of the Study:

• To evaluate occupational exposure to nanoparticles and ultrafine particles during the use of nanomaterials in construction.
• To quantify particle number, surface area, mass concentration, and size distribution.

Main Methods:

• Workplace measurements were conducted during nanomortar and nanocrete abrasion and pouring.
• Particle analysis utilized DiSCmini, GRIMM 1.109 optical counter, and DustTrak monitor.

Main Results:

• Mean particle number concentrations ranged from 1.4×10^4 to 1.0×10^5 particles/cm³.
• Particle sizes varied, with a majority between 60-145 nm, and sub-micrometer particles constituted at least 50% of the mass concentration.
• Nanomortar abrasion showed the highest particle number and surface area concentrations.

Conclusions:

• Construction processes involving nanostructured materials significantly increase ultrafine particle emissions.
• These ultrafine particles pose a potential health risk to individuals exposed during the use of these advanced construction materials.